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Gatti LV, Cunha CL, Marani L, Cassol HLG, Messias CG, Arai E, Denning AS, Soler LS, Almeida C, Setzer A, Domingues LG, Basso LS, Miller JB, Gloor M, Correia CSC, Tejada G, Neves RAL, Rajao R, Nunes F, Filho BSS, Schmitt J, Nobre C, Corrêa SM, Sanches AH, Aragão LEOC, Anderson L, Von Randow C, Crispim SP, Silva FM, Machado GBM. Increased Amazon carbon emissions mainly from decline in law enforcement. Nature 2023; 621:318-323. [PMID: 37612502 DOI: 10.1038/s41586-023-06390-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 06/30/2023] [Indexed: 08/25/2023]
Abstract
The Amazon forest carbon sink is declining, mainly as a result of land-use and climate change1-4. Here we investigate how changes in law enforcement of environmental protection policies may have affected the Amazonian carbon balance between 2010 and 2018 compared with 2019 and 2020, based on atmospheric CO2 vertical profiles5,6, deforestation7 and fire data8, as well as infraction notices related to illegal deforestation9. We estimate that Amazonia carbon emissions increased from a mean of 0.24 ± 0.08 PgC year-1 in 2010-2018 to 0.44 ± 0.10 PgC year-1 in 2019 and 0.52 ± 0.10 PgC year-1 in 2020 (± uncertainty). The observed increases in deforestation were 82% and 77% (94% accuracy) and burned area were 14% and 42% in 2019 and 2020 compared with the 2010-2018 mean, respectively. We find that the numbers of notifications of infractions against flora decreased by 30% and 54% and fines paid by 74% and 89% in 2019 and 2020, respectively. Carbon losses during 2019-2020 were comparable with those of the record warm El Niño (2015-2016) without an extreme drought event. Statistical tests show that the observed differences between the 2010-2018 mean and 2019-2020 are unlikely to have arisen by chance. The changes in the carbon budget of Amazonia during 2019-2020 were mainly because of western Amazonia becoming a carbon source. Our results indicate that a decline in law enforcement led to increases in deforestation, biomass burning and forest degradation, which increased carbon emissions and enhanced drying and warming of the Amazon forests.
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Affiliation(s)
- Luciana V Gatti
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil.
- Nuclear and Energy Research Institute (IPEN), São Paulo, Brazil.
| | - Camilla L Cunha
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Luciano Marani
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Henrique L G Cassol
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Cassiano Gustavo Messias
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Egidio Arai
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | | | - Luciana S Soler
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Claudio Almeida
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Alberto Setzer
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Lucas Gatti Domingues
- Nuclear and Energy Research Institute (IPEN), São Paulo, Brazil
- National Isotope Centre, GNS Science, Lower Hutt, New Zealand
| | - Luana S Basso
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - John B Miller
- Global Monitoring Laboratory, National Oceanic and Atmospheric Administration (NOAA), Boulder, CO, USA
| | - Manuel Gloor
- School of Geography, University of Leeds, Leeds, UK
| | - Caio S C Correia
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
- Nuclear and Energy Research Institute (IPEN), São Paulo, Brazil
| | - Graciela Tejada
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Raiane A L Neves
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Raoni Rajao
- Remote Sensing Center, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Felipe Nunes
- Remote Sensing Center, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Britaldo S S Filho
- Remote Sensing Center, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Jair Schmitt
- Remote Sensing Center, Universidade Federal de Minas Gerais, Belo Horizonte, Brazil
| | - Carlos Nobre
- Instituto de Estudos Avançados (IEA), University of São Paulo (USP), São Paulo, Brazil
| | - Sergio M Corrêa
- Rio de Janeiro State University (UERJ), Rio de Janeiro, Brazil
| | - Alber H Sanches
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Luiz E O C Aragão
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Liana Anderson
- Centro Nacional de Monitoramento e Alertas de Desastres Naturais (CEMADEN), São José dos Campos, Brazil
| | - Celso Von Randow
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Stephane P Crispim
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Francine M Silva
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
| | - Guilherme B M Machado
- General Coordination of Earth Science (CGCT), National Institute for Space Research (INPE), São José dos Campos, Brazil
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Brienen R, Helle G, Pons T, Boom A, Gloor M, Groenendijk P, Clerici S, Leng M, Jones C. Paired analysis of tree ring width and carbon isotopes indicates when controls on tropical tree growth change from light to water limitations. Tree Physiol 2022; 42:1131-1148. [PMID: 34718816 PMCID: PMC9190751 DOI: 10.1093/treephys/tpab142] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/19/2021] [Accepted: 10/22/2021] [Indexed: 06/13/2023]
Abstract
Light and water availability are likely to vary over the lifespan of closed-canopy forest trees, with understory trees experiencing greater limitations to growth by light and canopy trees greater limitation due to drought. As drought and shade have opposing effects on isotope discrimination (Δ13C), paired measurement of ring width and Δ13C can potentially be used to differentiate between water and light limitations on tree growth. We tested this approach for Cedrela trees from three tropical forests in Bolivia and Mexico that differ in rainfall and canopy structure. Using lifetime ring width and Δ13C data for trees of up to and over 200 years old, we assessed how controls on tree growth changed from understory to the canopy. Growth and Δ13C are mostly anti-correlated in the understory, but this anti-correlation disappeared or weakened when trees reached the canopy, especially at the wettest site. This indicates that understory growth variation is controlled by photosynthetic carbon assimilation due to variation in light levels. Once trees reached the canopy, inter-annual variation in growth and Δ13C at one of the dry sites showed positive correlations, indicating that inter-annual variation in growth is driven by variation in water stress affecting stomatal conductance. Paired analysis of ring widths and carbon isotopes provides significant insight in what environmental factors control growth over a tree's life; strong light limitations for understory trees in closed-canopy moist forests switched to drought stress for (sub)canopy trees in dry forests. We show that combined isotope and ring width measurements can significantly improve our insights in tree functioning and be used to disentangle limitations due to shade from those due to drought.
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Affiliation(s)
| | - Gerhard Helle
- GFZ—German Research Centre for Geosciences, Section 4.3 Climate Dynamics and Landscape Evolution, 14473 Potsdam, Germany
| | - Thijs Pons
- Plant Ecophysiology, Institute of Environmental Biology, Utrecht University, 3512 Utrecht, The Netherlands
| | - Arnoud Boom
- School of Geography, University of Leicester, Leicester LE1 7RH, UK
| | - Manuel Gloor
- School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - Peter Groenendijk
- Department of Plant Biology, Institute of Biology, PO Box: 6109, University of Campinas, UNICAMP, Campinas 13083-970, Brazil
- Ecology and Biodiversity, Institute of Environmental Biology, Utrecht University, 3584 Utrecht, The Netherlands
| | | | - Melanie Leng
- National Environmental Isotope Facility, British Geological Survey, Nottingham NG12 5GG, UK
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3
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Cintra BBL, Gloor M, Boom A, Schöngart J, Baker JCA, Cruz FW, Clerici S, Brienen RJW. Tree-ring oxygen isotopes record a decrease in Amazon dry season rainfall over the past 40 years. Clim Dyn 2021; 59:1401-1414. [PMID: 35971539 PMCID: PMC9372001 DOI: 10.1007/s00382-021-06046-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2021] [Accepted: 11/07/2021] [Indexed: 06/01/2023]
Abstract
UNLABELLED Extant climate observations suggest the dry season over large parts of the Amazon Basin has become longer and drier over recent decades. However, such possible intensification of the Amazon dry season and its underlying causes are still a matter of debate. Here we used oxygen isotope ratios in tree rings (δ18OTR) from six floodplain trees from the western Amazon to assess changes in past climate. Our analysis shows that δ18OTR of these trees is negatively related to inter-annual variability of precipitation during the dry season over large parts of the Amazon Basin, consistent with a Rayleigh rainout model. Furthermore δ18OTR increases by approximately 2‰ over the last four decades (~ 1970-2014) providing evidence of an Amazon drying trend independent from satellite and in situ rainfall observations. Using a Rayleigh rainout framework, we estimate basin-wide dry season rainfall to have decreased by up to 30%. The δ18OTR record further suggests such drying trend may not be unprecedented over the past 80 years. Analysis of δ18OTR with sea surface temperatures indicates a strong role of a warming Tropical North Atlantic Ocean in driving this long-term increase in δ18OTR and decrease in dry season rainfall. SUPPLEMENTARY INFORMATION The online version contains supplementary material available at 10.1007/s00382-021-06046-7.
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Affiliation(s)
- Bruno B. L. Cintra
- School of Geography, University of Leeds, Garstang North Building, Leeds, LS2 9JT UK
- Institute of Biosciences, University of São Paulo, Rua do Matão 14, São Paulo, 05508-090 Brazil
| | - Manuel Gloor
- School of Geography, University of Leeds, Garstang North Building, Leeds, LS2 9JT UK
| | - Arnoud Boom
- School of Geography, Geology and the Environment, University of Leicester, Bennet Building, University Road, Leicester, LE1 7RH UK
| | - Jochen Schöngart
- Coordination of Environmental Dynamics, National Institute for Amazon Research, Av. André Araújo 2936, Petrópolis, Manaus, 69067-375 Brazil
| | | | - Francisco W. Cruz
- Institute of Geosciences, University of São Paulo, Rua do Lago 562, São Paulo, 05508-080 Brazil
| | - Santiago Clerici
- School of Geography, University of Leeds, Garstang North Building, Leeds, LS2 9JT UK
| | - Roel J. W. Brienen
- School of Geography, University of Leeds, Garstang North Building, Leeds, LS2 9JT UK
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4
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Zueger T, Gloor M, Lehmann V, Melmer A, Kraus M, Feuerriegel S, Laimer M, Stettler C. White coat adherence effect on glucose control in adult individuals with diabetes. Diabetes Res Clin Pract 2020; 168:108392. [PMID: 32858099 DOI: 10.1016/j.diabres.2020.108392] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 08/06/2020] [Accepted: 08/21/2020] [Indexed: 11/24/2022]
Abstract
BACKGROUND White coat adherence (WCA) is defined as an increased adherence to treatment regimens directly before a visit with a healthcare provider. Little is known on the effect of WCA on glucose control in adult patients with diabetes mellitus. METHODS The present study is based on 618 CGM-observations of 276 patients with diabetes treated between January 2013 and July 2018. The analysis compares data from the 3 days prior to a visit (p1) with the preceding 25 days (p2). RESULTS Sensor use was higher during p1 than p2 (92.8 ± 7.3% vs 88.8 ± 7.5%; p < 0.001). Mean glucose [MG] and coefficient of variation [CV] were lower in p1 compared to p2 (MG 163.9 ± 39.2 mg/dL vs 166.9 ± 35.7 mg/dL, p = 0.001; CV 33.5 ± 8.4% vs 36.0 ± 7.0%, p < 0.001; respectively). Time in range (70-180 mg/dL) was higher in p1 than p2 (61.4 ± 21.2% vs 60.0 ± 18.4%, p = 0.002). Sensitivity-analysis showed that WCA effect was mainly detected in patients with HbA1c > 7% [53 mmol/mol]. CONCLUSION This study reveals a WCA effect on pre-visit glucose control in adult patients with diabetes. The effect was most pronounced in patients with moderate to poor glycemic control. In these patients, analysis of CGM data should encompass a minimum of 1 to 2 weeks prior to a consultation.
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Affiliation(s)
- Thomas Zueger
- Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; Department of Management, Technology, and Economics, ETH Zurich, 8006 Zurich, Switzerland.
| | - Manuel Gloor
- Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Vera Lehmann
- Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Andreas Melmer
- Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Mathias Kraus
- Department of Management, Technology, and Economics, ETH Zurich, 8006 Zurich, Switzerland
| | - Stefan Feuerriegel
- Department of Management, Technology, and Economics, ETH Zurich, 8006 Zurich, Switzerland
| | - Markus Laimer
- Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
| | - Christoph Stettler
- Department of Diabetes, Endocrinology, Nutritional Medicine and Metabolism, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland
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5
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Sullivan MJP, Lewis SL, Affum-Baffoe K, Castilho C, Costa F, Sanchez AC, Ewango CEN, Hubau W, Marimon B, Monteagudo-Mendoza A, Qie L, Sonké B, Martinez RV, Baker TR, Brienen RJW, Feldpausch TR, Galbraith D, Gloor M, Malhi Y, Aiba SI, Alexiades MN, Almeida EC, de Oliveira EA, Dávila EÁ, Loayza PA, Andrade A, Vieira SA, Aragão LEOC, Araujo-Murakami A, Arets EJMM, Arroyo L, Ashton P, Aymard C. G, Baccaro FB, Banin LF, Baraloto C, Camargo PB, Barlow J, Barroso J, Bastin JF, Batterman SA, Beeckman H, Begne SK, Bennett AC, Berenguer E, Berry N, Blanc L, Boeckx P, Bogaert J, Bonal D, Bongers F, Bradford M, Brearley FQ, Brncic T, Brown F, Burban B, Camargo JL, Castro W, Céron C, Ribeiro SC, Moscoso VC, Chave J, Chezeaux E, Clark CJ, de Souza FC, Collins M, Comiskey JA, Valverde FC, Medina MC, da Costa L, Dančák M, Dargie GC, Davies S, Cardozo ND, de Haulleville T, de Medeiros MB, del Aguila Pasquel J, Derroire G, Di Fiore A, Doucet JL, Dourdain A, Droissart V, Duque LF, Ekoungoulou R, Elias F, Erwin T, Esquivel-Muelbert A, Fauset S, Ferreira J, Llampazo GF, Foli E, Ford A, Gilpin M, Hall JS, Hamer KC, Hamilton AC, Harris DJ, Hart TB, Hédl R, Herault B, Herrera R, Higuchi N, Hladik A, Coronado EH, Huamantupa-Chuquimaco I, Huasco WH, Jeffery KJ, Jimenez-Rojas E, Kalamandeen M, Djuikouo MNK, Kearsley E, Umetsu RK, Kho LK, Killeen T, Kitayama K, Klitgaard B, Koch A, Labrière N, Laurance W, Laurance S, Leal ME, Levesley A, Lima AJN, Lisingo J, Lopes AP, Lopez-Gonzalez G, Lovejoy T, Lovett JC, Lowe R, Magnusson WE, Malumbres-Olarte J, Manzatto ÂG, Marimon BH, Marshall AR, Marthews T, de Almeida Reis SM, Maycock C, Melgaço K, Mendoza C, Metali F, Mihindou V, Milliken W, Mitchard ETA, Morandi PS, Mossman HL, Nagy L, Nascimento H, Neill D, Nilus R, Vargas PN, Palacios W, Camacho NP, Peacock J, Pendry C, Peñuela Mora MC, Pickavance GC, Pipoly J, Pitman N, Playfair M, Poorter L, Poulsen JR, Poulsen AD, Preziosi R, Prieto A, Primack RB, Ramírez-Angulo H, Reitsma J, Réjou-Méchain M, Correa ZR, de Sousa TR, Bayona LR, Roopsind A, Rudas A, Rutishauser E, Abu Salim K, Salomão RP, Schietti J, Sheil D, Silva RC, Espejo JS, Valeria CS, Silveira M, Simo-Droissart M, Simon MF, Singh J, Soto Shareva YC, Stahl C, Stropp J, Sukri R, Sunderland T, Svátek M, Swaine MD, Swamy V, Taedoumg H, Talbot J, Taplin J, Taylor D, ter Steege H, Terborgh J, Thomas R, Thomas SC, Torres-Lezama A, Umunay P, Gamarra LV, van der Heijden G, van der Hout P, van der Meer P, van Nieuwstadt M, Verbeeck H, Vernimmen R, Vicentini A, Vieira ICG, Torre EV, Vleminckx J, Vos V, Wang O, White LJT, Willcock S, Woods JT, Wortel V, Young K, Zagt R, Zemagho L, Zuidema PA, Zwerts JA, Phillips OL. Long-term thermal sensitivity of Earth’s tropical forests. Science 2020; 368:869-874. [DOI: 10.1126/science.aaw7578] [Citation(s) in RCA: 121] [Impact Index Per Article: 30.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2019] [Accepted: 03/05/2020] [Indexed: 01/21/2023]
Affiliation(s)
- Martin J. P. Sullivan
- School of Geography, University of Leeds, Leeds, UK
- Department of Natural Sciences, Manchester Metropolitan University, Manchester, UK
| | - Simon L. Lewis
- School of Geography, University of Leeds, Leeds, UK
- Department of Geography, University College London, London, UK
| | | | - Carolina Castilho
- Embrapa Roraima, Brazilian Agricultural Research Corporation (EMBRAPA), Brasília, Brazil
| | - Flávia Costa
- Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Brazil
| | - Aida Cuni Sanchez
- Department of Ecosystem Science and Sustainability, Colorado State University, Fort Collins, CO, USA
- Department of Environment and Geography, University of York, York, UK
| | - Corneille E. N. Ewango
- DR Congo Programme, Wildlife Conservation Society, Kisangani, Democratic Republic of Congo
- Centre de Formation et de Recherche en Conservation Forestiere (CEFRECOF), Epulu, Democratic Republic of Congo
- Faculté de Gestion de Ressources Naturelles Renouvelables, Université de Kisangani, Kisangani, Democratic Republic of Congo
| | - Wannes Hubau
- School of Geography, University of Leeds, Leeds, UK
- Service of Wood Biology, Royal Museum for Central Africa, Tervuren, Belgium
- Department of Environment, Laboratory of Wood Technology (Woodlab), Ghent University, Ghent, Belgium
| | - Beatriz Marimon
- UNEMAT - Universidade do Estado de Mato Grosso, Nova Xavantina-MT, Brazil
| | | | - Lan Qie
- School of Life Sciences, University of Lincoln, Lincoln, UK
| | - Bonaventure Sonké
- Plant Systematics and Ecology Laboratory, Higher Teachers’ Training College, University of Yaoundé I, Yaoundé, Cameroon
| | | | | | | | - Ted R. Feldpausch
- Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
| | | | - Manuel Gloor
- School of Geography, University of Leeds, Leeds, UK
| | - Yadvinder Malhi
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK
| | - Shin-Ichiro Aiba
- Faculty of Environmental Earth Science, Hokkaido University, Sapporo, Japan
| | | | - Everton C. Almeida
- Instituto de Biodiversidade e Florestas, Universidade Federal do Oeste do Pará, Santarém - PA, Brazil
| | | | - Esteban Álvarez Dávila
- Escuela de Ciencias Agrícolas, Pecuarias y del Medio Ambiente, National Open University and Distance, Bogotá, Colombia
| | | | - Ana Andrade
- Projeto Dinâmica Biológica de Fragmentos Florestais, Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil
| | | | - Luiz E. O. C. Aragão
- Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, UK
- National Institute for Space Research (INPE), São José dos Campos, SP, Brazil
| | - Alejandro Araujo-Murakami
- Museo de Historia Natural Noel Kempff Mercado, Universidad Autónoma Gabriel René Moreno, Santa Cruz, Bolivia
| | | | - Luzmila Arroyo
- Dirección de la Carrera de Biología, Universidad Autónoma Gabriel René Moreno, Santa Cruz, Bolivia
| | - Peter Ashton
- Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA, USA
| | - Gerardo Aymard C.
- Programa de Ciencias del Agro y el Mar, Herbario Universitario, Guanare, Venezuela
| | | | | | - Christopher Baraloto
- International Center for Tropical Botany, Department of Biological Sciences, Florida International University, Miami, FL, USA
| | - Plínio Barbosa Camargo
- Centro de Energia Nuclear na Agricultura, Universidade de São Paulo, São Paulo, SP, Brazil
| | - Jos Barlow
- Lancaster Environment Centre, Lancaster University, Lancaster, UK
| | - Jorcely Barroso
- Centro Multidisciplinar, Universidade Federal do Acre, Cruzeiro do Sul, AC, Brazil
| | - Jean-François Bastin
- Institure of Integrative Biology, ETH Zurich, Zurich, Switzerland
- Department of Environment, Computational and Applied Vegetation Ecology (CAVELab), Ghent University, Ghent, Belgium
| | - Sarah A. Batterman
- School of Geography, University of Leeds, Leeds, UK
- Priestley International Centre for Climate, University of Leeds, Leeds, UK
- Smithsonian Tropical Research Institute, Panama, Panama
- Cary Institute of Ecosystem Studies, Millbrook, NY, USA
| | - Hans Beeckman
- Service of Wood Biology, Royal Museum for Central Africa, Tervuren, Belgium
| | - Serge K. Begne
- School of Geography, University of Leeds, Leeds, UK
- Plant Systematics and Ecology Laboratory, Higher Teachers’ Training College, University of Yaoundé I, Yaoundé, Cameroon
| | | | - Erika Berenguer
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK
- Lancaster Environment Centre, Lancaster University, Lancaster, UK
| | | | - Lilian Blanc
- UR Forest and Societies, CIRAD, Montpellier, France
| | - Pascal Boeckx
- Isotope Bioscience Laboratory (ISOFYS), Ghent University, Ghent, Belgium
| | - Jan Bogaert
- Gembloux Agro-Bio Tech, University of Liège, Liège, Belgium
| | | | - Frans Bongers
- Forest Ecology and Forest Management Group, Wageningen University, Wageningen, Netherlands
| | | | - Francis Q. Brearley
- Department of Natural Sciences, Manchester Metropolitan University, Manchester, UK
| | - Terry Brncic
- Congo Programme, Wildlife Conservation Society, Brazzavile, Republic of Congo
| | | | - Benoit Burban
- INRAE, UMR EcoFoG, CNRS, CIRAD, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, French Guiana
| | - José Luís Camargo
- Projeto Dinâmica Biológica de Fragmentos Florestais, Instituto Nacional de Pesquisas da Amazônia, Manaus, Brazil
| | - Wendeson Castro
- Programa de Pós-Graduação Ecologia e Manejo de Recursos Naturais, Universidade Federal do Acre, Rio Branco, AC, Brazil
| | - Carlos Céron
- Herbario Alfredo Paredes, Universidad Central del Ecuador, Quito, Ecuador
| | - Sabina Cerruto Ribeiro
- Centro de Ciências Biológicas e da Natureza, Universidade Federal do Acre, Rio Branco, AC, Brazil
| | | | - Jerôme Chave
- Laboratoire Évolution et Diversité Biologique, UMR 5174 (CNRS/IRD/UPS), CNRS, Toulouse, France
| | | | - Connie J. Clark
- Nicholas School of the Environment, Duke University, Durham, NC, USA
| | | | - Murray Collins
- Grantham Research Institute on Climate Change and the Environment, London, UK
- School of Geosciences, University of Edinburgh, Edinburgh, UK
| | - James A. Comiskey
- Inventory and Monitoring Program, National Park Service, Fredericksburg, VA, USA
- Smithsonian Institution, Washington, DC, USA
| | | | | | - Lola da Costa
- Instituto de Geociências, Faculdade de Meteorologia, Universidade Federal do Para, Belém, PA, Brazil
| | - Martin Dančák
- Faculty of Science, Department of Ecology and Environmental Sciences, Palacký University Olomouc, Olomouc, Czech Republic
| | | | - Stuart Davies
- Center for Tropical Forest Science, Smithsonian Tropical Research Institute, Panama, Panama
| | | | - Thales de Haulleville
- Service of Wood Biology, Royal Museum for Central Africa, Tervuren, Belgium
- Gembloux Agro-Bio Tech, University of Liège, Liège, Belgium
| | - Marcelo Brilhante de Medeiros
- Embrapa Genetic Resources and Biotechnology, Brazilian Agricultural Research Corporation (EMBRAPA), Brasília, Brazil
| | | | - Géraldine Derroire
- Cirad, UMR EcoFoG (AgroParisTech, CNRS, INRAE, Université des Antilles, Université de Guyane), Kourou, French Guiana
| | - Anthony Di Fiore
- Department of Anthropology, The University of Texas at Austin, Austin, TX, USA
| | - Jean-Louis Doucet
- Forest Resources Management, Gembloux Agro-Bio Tech, University of Liège, Liège, Belgium
| | - Aurélie Dourdain
- Cirad, UMR EcoFoG (AgroParisTech, CNRS, INRAE, Université des Antilles, Université de Guyane), Kourou, French Guiana
| | - Vincent Droissart
- AMAP, Universite de Montpellier, IRD, CNRS, CIRAD, INRAE, Montpellier, France
| | | | | | - Fernando Elias
- Institute of Biological Sciences, Universidade Federal do Pará, Belém, PA, Brazil
| | - Terry Erwin
- National Museum of Natural History, Smithsonian Institution, Washington, DC, USA
| | | | - Sophie Fauset
- School of Geography, Earth and Environmental Sciences, University of Plymouth, Plymouth, UK
| | - Joice Ferreira
- Embrapa Amazônia Oriental, Brazilian Agricultural Research Corporation (EMBRAPA), Brasília, Brazil
| | | | - Ernest Foli
- Forestry Research Institute of Ghana (FORIG), Kumasi, Ghana
| | | | | | - Jefferson S. Hall
- Smithsonian Institution Forest Global Earth Observatory (ForestGEO), Smithsonian Tropical Research Institute, Washington, DC, USA
| | | | | | | | - Terese B. Hart
- Lukuru Wildlife Research Foundation, Kinshasa, Democratic Republic of Congo
- Division of Vertebrate Zoology, Yale Peabody Museum of Natural History, New Haven, CT, USA
| | - Radim Hédl
- Institute of Botany, Czech Academy of Sciences, Brno, Czech Republic
- Department of Botany, Palacký University in Olomouc, Olomouc, Czech Republic
| | - Bruno Herault
- Isotope Bioscience Laboratory (ISOFYS), Ghent University, Ghent, Belgium
- CIRAD, UPR Forêts et Sociétés, Yamoussoukro, Côte d’Ivoire
- Institut National Polytechnique Félix Houphouët-Boigny, INP-HB, Yamoussoukro, Côte d’Ivoire
| | - Rafael Herrera
- Instituto Venezolano de Investigaciones Científicas (IVIC), Caracas, Venezuela
| | - Niro Higuchi
- Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Brazil
| | - Annette Hladik
- Département Hommes, Natures, Sociétés, Muséum National d'Histoire Naturel, Paris, France
| | | | | | | | - Kathryn J. Jeffery
- Biological and Environmental Sciences, University of Stirling, Stirling, UK
| | | | - Michelle Kalamandeen
- School of Geography, University of Leeds, Leeds, UK
- Living with Lakes Centre, Laurentian University, Sudbury, Canada
- Department of Plant Sciences, University of Cambridge, Cambridge, UK
| | - Marie Noël Kamdem Djuikouo
- Faculté de Gestion de Ressources Naturelles Renouvelables, Université de Kisangani, Kisangani, Democratic Republic of Congo
- Department of Environment, Laboratory of Wood Technology (Woodlab), Ghent University, Ghent, Belgium
- Plant Systematics and Ecology Laboratory, Higher Teachers’ Training College, University of Yaoundé I, Yaoundé, Cameroon
- Faculty of Science, Department of Botany and Plant Physiology, University of Buea, Buea, Cameroon
| | - Elizabeth Kearsley
- Department of Environment, Computational and Applied Vegetation Ecology (CAVELab), Ghent University, Ghent, Belgium
| | | | - Lip Khoon Kho
- Tropical Peat Research Institute, Malaysian Palm Oil Board, Selangor, Malaysia
| | | | | | | | - Alexander Koch
- Department of Earth Sciences, University of Hong Kong, Pok Ful Lam, Hong Kong Special Administrative Region, China
| | - Nicolas Labrière
- Laboratoire Évolution et Diversité Biologique, UMR 5174 (CNRS/IRD/UPS), CNRS, Toulouse, France
| | - William Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS) and College of Marine and Environmental Sciences, James Cook University, Douglas, QLD, Australia
| | - Susan Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS) and College of Marine and Environmental Sciences, James Cook University, Douglas, QLD, Australia
| | - Miguel E. Leal
- Uganda Programme, Wildlife Conservation Society, Kampala, Uganda
| | | | | | - Janvier Lisingo
- Faculté de Gestion de Ressources Naturelles Renouvelables, Université de Kisangani, Kisangani, Democratic Republic of Congo
| | - Aline P. Lopes
- National Institute for Space Research (INPE), São José dos Campos, SP, Brazil
| | | | - Tom Lovejoy
- Environmental Science and Policy, George Mason University, Fairfax, VA, USA
| | - Jon C. Lovett
- School of Geography, University of Leeds, Leeds, UK
- Royal Botanic Gardens Kew, Richmond, London, UK
| | - Richard Lowe
- Botany Department, University of Ibadan, Ibadan, Nigeria
| | - William E. Magnusson
- Coordenação da Biodiversidade, Instituto Nacional de Pesquisas da Amazônia (INPA), Mauaus, Brazil
| | - Jagoba Malumbres-Olarte
- cE3c – Centre for Ecology, Evolution and Environmental Changes / Azorean Biodiversity Group, Universidade dos Açores, Angra do Heroísmo, Azores, Portugal
- LIBRe – Laboratory for Integrative Biodiversity Research, Finnish Museum of Natural History, University of Helsinki, Helsinki, Finland
| | - Ângelo Gilberto Manzatto
- Laboratório de Biogeoquímica Ambiental Wolfgang C. Pfeiffer, Universidade Federal de Rondônia, Porto Velho - RO, Brazil
| | - Ben Hur Marimon
- Faculdade de Ciências Agrárias, Biológicas e Sociais Aplicadas, Universidad do Estado de Mato Grosso, Nova Xavantina-MT, Brazil
| | - Andrew R. Marshall
- Department of Environment and Geography, University of York, York, UK
- Tropical Forests and People Research Centre, University of the Sunshine Coast, Sippy Downs, QLD, Australia
- Flamingo Land Ltd., North Yorkshire, UK
| | - Toby Marthews
- UK Centre for Ecology and Hydrology, Wallingford, UK
| | - Simone Matias de Almeida Reis
- UNEMAT - Universidade do Estado de Mato Grosso, Nova Xavantina-MT, Brazil
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, Oxford, UK
| | - Colin Maycock
- School of International Tropical Forestry, Universiti Malaysia Sabah, Kota Kinabalu, Malaysia
| | | | - Casimiro Mendoza
- Escuela de Ciencias Forestales, Unidad Académica del Trópico, Universidad Mayor de San Simón, Sacta, Bolivia
| | - Faizah Metali
- Faculty of Science, Universiti Brunei Darussalam, Brunei
| | - Vianet Mihindou
- Agence Nationale des Parcs Nationaux, Libreville, Gabon
- Ministère de la Forêt, de la Mer, de l'Environnement, Chargé du Plan Climat, Libreville, Gabon
| | | | | | - Paulo S. Morandi
- UNEMAT - Universidade do Estado de Mato Grosso, Nova Xavantina-MT, Brazil
| | - Hannah L. Mossman
- Department of Natural Sciences, Manchester Metropolitan University, Manchester, UK
| | - Laszlo Nagy
- Institute of Biology, University of Campinas, Campinas, SP, Brazil
| | | | - David Neill
- Facultad de Ingeniería Ambiental, Universidad Estatal Amazónica, Puyo, Pastaza, Ecuador
| | - Reuben Nilus
- Forest Research Centre, Sabah Forestry Department, Sepilok, Malaysia
| | - Percy Núñez Vargas
- Instituto Venezolano de Investigaciones Científicas (IVIC), Caracas, Venezuela
| | - Walter Palacios
- Carrera de Ingeniería Forestal, Universidad Tecnica del Norte, Ibarra, Ecuador
| | - Nadir Pallqui Camacho
- School of Geography, University of Leeds, Leeds, UK
- Instituto Venezolano de Investigaciones Científicas (IVIC), Caracas, Venezuela
| | | | | | | | | | - John Pipoly
- Public Communications and Outreach Group, Parks and Recreation Division, Oakland Park, FL, USA
| | - Nigel Pitman
- Keller Science Action Center, Field Museum, Chicago, IL, USA
| | - Maureen Playfair
- Centre for Agricultural Research in Suriname (CELOS), Paramaribo, Suriname
| | - Lourens Poorter
- Forest Ecology and Forest Management Group, Wageningen University, Wageningen, Netherlands
| | - John R. Poulsen
- Nicholas School of the Environment, Duke University, Durham, NC, USA
| | | | - Richard Preziosi
- Department of Natural Sciences, Manchester Metropolitan University, Manchester, UK
| | - Adriana Prieto
- Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Leticia, Colombia
| | | | - Hirma Ramírez-Angulo
- Institute of Research for Forestry Development (INDEFOR), Universidad de los Andes, Mérida, Venezuela
| | | | | | | | | | - Lily Rodriguez Bayona
- Centro de Conservacion, Investigacion y Manejo de Areas Naturales, CIMA Cordillera Azul, Lima, Peru
| | - Anand Roopsind
- Iwokrama International Centre for Rainforest Conservation and Development, Georgetown, Guyana
| | - Agustín Rudas
- Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Leticia, Colombia
| | - Ervan Rutishauser
- Smithsonian Tropical Research Institute, Panama, Panama
- Carboforexpert, Geneva, Switzerland
| | | | - Rafael P. Salomão
- Universidade Federal Rural da Amazônia/CAPES, Belém, PA, Brazil
- Museu Paraense Emílio Goeldi, Belém, PA, Brazil
| | - Juliana Schietti
- Instituto Nacional de Pesquisas da Amazônia (INPA), Manaus, Brazil
| | - Douglas Sheil
- Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, Ås, Norway
| | - Richarlly C. Silva
- Centro de Ciências Biológicas e da Natureza, Universidade Federal do Acre, Rio Branco, AC, Brazil
- Instituto Federal do Acre, Rio Branco, AC, Brazil
| | | | | | - Marcos Silveira
- Centro de Ciências Biológicas e da Natureza, Universidade Federal do Acre, Rio Branco, AC, Brazil
| | - Murielle Simo-Droissart
- Plant Systematics and Ecology Laboratory, Higher Teachers’ Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Marcelo Fragomeni Simon
- Embrapa Genetic Resources and Biotechnology, Brazilian Agricultural Research Corporation (EMBRAPA), Brasília, Brazil
| | - James Singh
- Guyana Forestry Commission, Georgetown, Guyana
| | | | - Clement Stahl
- INRAE, UMR EcoFoG, CNRS, CIRAD, AgroParisTech, Université des Antilles, Université de Guyane, 97310 Kourou, French Guiana
| | - Juliana Stropp
- Departamento de Biogeografía y Cambio Global, Museo Nacional de Ciencias Naturales, Consejo Superior de Investigaciones Científicas (MNCN-CSIC), Madrid, Spain
| | - Rahayu Sukri
- Faculty of Science, Universiti Brunei Darussalam, Brunei
| | - Terry Sunderland
- Sustainable Landscapes and Food Systems, Center for International Forestry Research, Bogor, Indonesia
- Faculty of Forestry, University of British Columbia, Vancouver, Canada
| | - Martin Svátek
- Department of Forest Botany, Dendrology and Geobiocoenology, Mendel University in Brno, Brno, Czech Republic
| | - Michael D. Swaine
- Department of Plant and Soil Science, School of Biological Sciences, University of Aberdeen, Aberdeen, UK
| | - Varun Swamy
- Institute for Conservation Research, San Diego Zoo, San Diego, CA. USA
| | - Hermann Taedoumg
- Department of Plant Biology, Faculty of Sciences, University of Yaounde 1, Yaoundé, Cameroon
- Bioversity International, Yaoundé, Cameroon
| | - Joey Talbot
- School of Geography, University of Leeds, Leeds, UK
| | - James Taplin
- UK Research and Innovation, Innovate UK, London, UK
| | - David Taylor
- Department of Geography, National University of Singapore, Singapore
| | - Hans ter Steege
- Naturalis Biodiversity Center, Leiden, Netherlands
- Systems Ecology, Vrije Universiteit Amsterdam, Amsterdam, Netherlands
| | - John Terborgh
- Nicholas School of the Environment, Duke University, Durham, NC, USA
| | - Raquel Thomas
- Iwokrama International Centre for Rainforest Conservation and Development, Georgetown, Guyana
| | - Sean C. Thomas
- Faculty of Forestry, University of Toronto, Toronto, Canada
| | | | - Peter Umunay
- Wildlife Conservation Society, New York, NY, USA
- Yale School of Forestry and Environmental Studies, Yale University, New Haven, CT, USA
| | | | | | | | | | | | - Hans Verbeeck
- Department of Environment, Computational and Applied Vegetation Ecology (CAVELab), Ghent University, Ghent, Belgium
| | | | | | | | - Emilio Vilanova Torre
- School of Environmental and Forest Sciences, University of Washington, Seattle, OR, USA
| | - Jason Vleminckx
- International Center for Tropical Botany, Department of Biological Sciences, Florida International University, Miami, FL, USA
| | - Vincent Vos
- Centro de Investigación y Promoción del Campesinado, La Paz, Bolivia
- Universidad Autónoma del Beni José Ballivián, Riberalta, Bolivia
| | - Ophelia Wang
- School of Earth Sciences and Environmental Sustainability, Northern Arizona University, Flagstaff, AZ, USA
| | - Lee J. T. White
- Biological and Environmental Sciences, University of Stirling, Stirling, UK
- Agence Nationale des Parcs Nationaux, Libreville, Gabon
- Institut de Recherche en Ecologie Tropicale, Libreville, Gabon
| | - Simon Willcock
- School of Natural Sciences, University of Bangor, Bangor, UK
| | | | - Verginia Wortel
- Forest Management, Centre for Agricultural Research in Suriname (CELOS), Paramaribo, Suriname
| | - Kenneth Young
- Department of Geography and The Environment, University of Texas at Austin, Austin, TX, USA
| | | | - Lise Zemagho
- Plant Systematics and Ecology Laboratory, Higher Teachers’ Training College, University of Yaoundé I, Yaoundé, Cameroon
| | - Pieter A. Zuidema
- Forest Ecology and Forest Management Group, Wageningen University, Wageningen, Netherlands
| | - Joeri A. Zwerts
- Centre for Agricultural Research in Suriname (CELOS), Paramaribo, Suriname
- Utrecht University, Utrecht, Netherlands
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6
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Duchesne L, Houle D, Ouimet R, Caldwell L, Gloor M, Brienen R. Large apparent growth increases in boreal forests inferred from tree-rings are an artefact of sampling biases. Sci Rep 2019; 9:6832. [PMID: 31048703 PMCID: PMC6497877 DOI: 10.1038/s41598-019-43243-1] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2018] [Accepted: 04/18/2019] [Indexed: 12/02/2022] Open
Abstract
Tree rings are thought to be a powerful tool to reconstruct historical growth changes and have been widely used to assess tree responses to global warming. Demographic inferences suggest, however, that typical sampling procedures induce spurious trends in growth reconstructions. Here we use the world’s largest single tree-ring dataset (283,536 trees from 136,621 sites) from Quebec, Canada, to assess to what extent growth reconstructions based on these - and thus any similar - data might be affected by this problem. Indeed, straightforward growth rate reconstructions based on these data suggest a six-fold increase in radial growth of black spruce (Picea mariana) from ~0.5 mm yr−1 in 1800 to ~2.5 mm yr−1 in 1990. While the strong correlation (R2 = 0.98) between this increase and that of atmospheric CO2 could suggest a causal relationship, we here unambiguously demonstrate that this growth trend is an artefact of sampling biases caused by the absence of old, fast-growing trees (cf. “slow-grower survivorship bias”) and of young, slow-growing trees (cf. “big-tree selection bias”) in the dataset. At the moment, we cannot envision how to remedy the issue of incomplete representation of cohorts in existing large-scale tree-ring datasets. Thus, innovation will be needed before such datasets can be used for growth rate reconstructions.
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Affiliation(s)
- Louis Duchesne
- Ministère des Forêts, de la Faune et des Parcs, Direction de la recherche forestière, 2700 Einstein Street, Quebec City, Quebec, G1P 3W8, Canada.
| | - Daniel Houle
- Ministère des Forêts, de la Faune et des Parcs, Direction de la recherche forestière, 2700 Einstein Street, Quebec City, Quebec, G1P 3W8, Canada.,Consortium on Regional Climatology and Adaptation to Climate Change (Ouranos), 550 Sherbrooke Street West, Montreal, Quebec, H3A 1B9, Canada
| | - Rock Ouimet
- Ministère des Forêts, de la Faune et des Parcs, Direction de la recherche forestière, 2700 Einstein Street, Quebec City, Quebec, G1P 3W8, Canada
| | - Liam Caldwell
- School of Geography, University of Leeds, Leeds, LS2 9JT, UK
| | - Manuel Gloor
- School of Geography, University of Leeds, Leeds, LS2 9JT, UK
| | - Roel Brienen
- School of Geography, University of Leeds, Leeds, LS2 9JT, UK
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7
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Barçante Ladvocat Cintra B, Gloor M, Boom A, Schöngart J, Locosselli GM, Brienen R. Contrasting controls on tree ring isotope variation for Amazon floodplain and terra firme trees. Tree Physiol 2019; 39:845-860. [PMID: 30824929 PMCID: PMC6594573 DOI: 10.1093/treephys/tpz009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2018] [Revised: 12/10/2018] [Accepted: 01/15/2019] [Indexed: 05/04/2023]
Abstract
Isotopes in tropical trees rings can improve our understanding of tree responses to climate. We assessed how climate and growing conditions affect tree-ring oxygen and carbon isotopes (δ18OTR and δ13CTR) in four Amazon trees. We analysed within-ring isotope variation for two terra firme (non-flooded) and two floodplain trees growing at sites with varying seasonality. We find distinct intra-annual patterns of δ18OTR and δ13CTR driven mostly by seasonal variation in weather and source water δ18O. Seasonal variation in isotopes was lowest for the tree growing under the wettest conditions. Tree ring cellulose isotope models based on existing theory reproduced well observed within-ring variation with possible contributions of both stomatal and mesophyll conductance to variation in δ13CTR. Climate analysis reveal that terra firme δ18OTR signals were related to basin-wide precipitation, indicating a source water δ18O influence, while floodplain trees recorded leaf enrichment effects related to local climate. Thus, intrinsically different processes (source water vs leaf enrichment) affect δ18OTR in the two different species analysed. These differences are likely a result of both species-specific traits and of the contrasting growing conditions in the floodplains and terra firme environments. Simultaneous analysis of δ13CTR and δ18OTR supports this interpretation as it shows strongly similar intra-annual patterns for both isotopes in the floodplain trees arising from a common control by leaf stomatal conductance, while terra firme trees showed less covariation between the two isotopes. Our results are interesting from a plant physiological perspective and have implications for climate reconstructions as trees record intrinsically different processes.
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Affiliation(s)
| | - Manuel Gloor
- School of Geography, University of Leeds, Leeds, Garstang North
| | - Arnoud Boom
- School of Geology, Geography and the Environment, Bennett Building, University Road, University of Leicester, Leicester, UK
| | - Jochen Schöngart
- National Institute for Amazon Research, Av. André Araújo, 2.936, Petrópolis, CEP 69.067-375, Manaus, Amazonas Brazil
| | - Giuliano Maselli Locosselli
- Institute of Biosciences, University of São Paulo, Rua do Matão, 14, Butantã, São Paulo, CEP 05508-090, Brazil
| | - Roel Brienen
- School of Geography, University of Leeds, Leeds, Garstang North
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8
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O'Sullivan M, Spracklen DV, Batterman SA, Arnold SR, Gloor M, Buermann W. Have Synergies Between Nitrogen Deposition and Atmospheric CO 2 Driven the Recent Enhancement of the Terrestrial Carbon Sink? Global Biogeochem Cycles 2019; 33:163-180. [PMID: 31007383 PMCID: PMC6472506 DOI: 10.1029/2018gb005922] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2018] [Revised: 12/19/2018] [Accepted: 01/14/2019] [Indexed: 05/26/2023]
Abstract
The terrestrial carbon sink has increased since the turn of this century at a time of increased fossil fuel burning, yet the mechanisms enhancing this sink are not fully understood. Here we assess the hypothesis that regional increases in nitrogen deposition since the early 2000s has alleviated nitrogen limitation and worked in tandem with enhanced CO2 fertilization to increase ecosystem productivity and carbon sequestration, providing a causal link between the parallel increases in emissions and the global land carbon sink. We use the Community Land Model (CLM4.5-BGC) to estimate the influence of changes in atmospheric CO2, nitrogen deposition, climate, and their interactions to changes in net primary production and net biome production. We focus on two periods, 1901-2016 and 1990-2016, to estimate changes in land carbon fluxes relative to historical and contemporary baselines, respectively. We find that over the historical period, nitrogen deposition (14%) and carbon-nitrogen synergy (14%) were significant contributors to the current terrestrial carbon sink, suggesting that long-term increases in nitrogen deposition led to a substantial increase in CO2 fertilization. However, relative to the contemporary baseline, changes in nitrogen deposition and carbon-nitrogen synergy had no substantial contribution to the 21st century increase in global carbon uptake. Nonetheless, we find that increased nitrogen deposition in East Asia since the early 1990s contributed 50% to the overall increase in net biome production over this region, highlighting the importance of carbon-nitrogen interactions. Therefore, potential large-scale changes in nitrogen deposition could have a significant impact on terrestrial carbon cycling and future climate.
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Affiliation(s)
- Michael O'Sullivan
- Institute for Climate and Atmospheric Science, School of Earth and EnvironmentUniversity of LeedsLeedsUK
| | - Dominick V. Spracklen
- Institute for Climate and Atmospheric Science, School of Earth and EnvironmentUniversity of LeedsLeedsUK
| | | | - Steve R. Arnold
- Institute for Climate and Atmospheric Science, School of Earth and EnvironmentUniversity of LeedsLeedsUK
| | | | - Wolfgang Buermann
- Institute for Climate and Atmospheric Science, School of Earth and EnvironmentUniversity of LeedsLeedsUK
- Institute of GeographyAugsburg UniversityAugsburgGermany
- Institute of the Environment and SustainabilityUniversity of California, Los AngelesLos AngelesCAUSA
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9
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Brienen RJW, Gloor M, Ziv G. A response to 'Trends in tropical tree growth: reanalysis confirms earlier findings'. Glob Chang Biol 2017; 23:e5-e6. [PMID: 27997068 DOI: 10.1111/gcb.13605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
We recently demonstrated that growth trends from tree rings from Van Der Sleen et al. (Nature Geoscience, 8, 2015, 24) and Groenendijk et al. (Global Change Biology, 21, 2015, 3762) are affected by demographic biases. In particular, clustered age distributions led to a negative bias in their growth trends. In a response, they challenge our analysis and present an alternative correction approach. We here show that their arguments are incorrect and based on misunderstanding of our analysis and that their alternative approach does not work.
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Affiliation(s)
- Roel J W Brienen
- School of Geography, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Manuel Gloor
- School of Geography, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Guy Ziv
- School of Geography, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
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10
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Fischmann A, Trentin C, Gloor M, Andriantsimiavona R, Fischer D, Boesen M, Kubassova O, Hinton M. Towards objective and reproducible measures of thigh muscle fat fraction in patients with Duchenne Muscular Dystrophy. Neuromuscul Disord 2017. [DOI: 10.1016/s0960-8966(17)30235-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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11
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Garcia M, Okell TW, Gloor M, Chappell MA, Jezzard P, Bieri O, Byrne JV. Feasibility of Flat Panel Detector CT in Perfusion Assessment of Brain Arteriovenous Malformations: Initial Clinical Experience. AJNR Am J Neuroradiol 2017; 38:735-739. [PMID: 28209577 DOI: 10.3174/ajnr.a5091] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2016] [Accepted: 12/01/2016] [Indexed: 11/07/2022]
Abstract
The different results from flat panel detector CT in various pathologies have provoked some discussion. Our aim was to assess the role of flat panel detector CT in brain arteriovenous malformations, which has not yet been assessed. Five patients with brain arteriovenous malformations were studied with flat panel detector CT, DSC-MR imaging, and vessel-encoded pseudocontinuous arterial spin-labeling. In glomerular brain arteriovenous malformations, perfusion was highest next to the brain arteriovenous malformation with decreasing values with increasing distance from the lesion. An inverse tendency was observed in the proliferative brain arteriovenous malformation. Flat panel detector CT, originally thought to measure blood volume, correlated more closely with arterial spin-labeling-CBF and DSC-CBF than with DSC-CBV. We conclude that flat panel detector CT perfusion depends on the time point chosen for data collection, which is triggered too early in these patients (ie, when contrast agent appears in the superior sagittal sinus after rapid shunting through the brain arteriovenous malformation). This finding, in combination with high data variability, makes flat panel detector CT inappropriate for perfusion assessment in brain arteriovenous malformations.
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Affiliation(s)
- M Garcia
- From the Division of Diagnostic and Interventional Neuroradiology (M. Garcia) .,Nuffield Department of Surgical Sciences and Department of Neuroradiology (M. Garcia, J.V.B.)
| | - T W Okell
- Centre for Functional Magnetic Resonance Imaging of the Brain (FMRIB Centre) (T.W.O., M.A.C., P.J.), Nuffield Department of Neurosciences
| | - M Gloor
- Division of Radiological Physics (M. Gloor, O.B.), Department of Radiology Clinic for Radiology and Nuclear Medicine, University of Basel Hospital, Basel, Switzerland
| | - M A Chappell
- Centre for Functional Magnetic Resonance Imaging of the Brain (FMRIB Centre) (T.W.O., M.A.C., P.J.), Nuffield Department of Neurosciences.,Institute of Biomedical Engineering (M.A.C.), Department of Engineering, University of Oxford, Oxford, United Kingdom
| | - P Jezzard
- Centre for Functional Magnetic Resonance Imaging of the Brain (FMRIB Centre) (T.W.O., M.A.C., P.J.), Nuffield Department of Neurosciences
| | - O Bieri
- Division of Radiological Physics (M. Gloor, O.B.), Department of Radiology Clinic for Radiology and Nuclear Medicine, University of Basel Hospital, Basel, Switzerland
| | - J V Byrne
- Nuffield Department of Surgical Sciences and Department of Neuroradiology (M. Garcia, J.V.B.)
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12
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Brienen RJW, Gloor M, Ziv G. Tree demography dominates long-term growth trends inferred from tree rings. Glob Chang Biol 2017; 23:474-484. [PMID: 27387088 PMCID: PMC6849721 DOI: 10.1111/gcb.13410] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Accepted: 05/29/2016] [Indexed: 05/05/2023]
Abstract
Understanding responses of forests to increasing CO2 and temperature is an important challenge, but no easy task. Tree rings are increasingly used to study such responses. In a recent study, van der Sleen et al. (2014) Nature Geoscience, 8, 4 used tree rings from 12 tropical tree species and find that despite increases in intrinsic water use efficiency, no growth stimulation is observed. This challenges the idea that increasing CO2 would stimulate growth. Unfortunately, tree ring analysis can be plagued by biases, resulting in spurious growth trends. While their study evaluated several biases, it does not account for all. In particular, one bias may have seriously affected their results. Several of the species have recruitment patterns, which are not uniform, but clustered around one specific year. This results in spurious negative growth trends if growth rates are calculated in fixed size classes, as 'fast-growing' trees reach the sampling diameter earlier compared to slow growers and thus fast growth rates tend to have earlier calendar dates. We assessed the effect of this 'nonuniform age bias' on observed growth trends and find that van der Sleen's conclusions of a lack of growth stimulation do not hold. Growth trends are - at least partially - driven by underlying recruitment or age distributions. Species with more clustered age distributions show more negative growth trends, and simulations to estimate the effect of species' age distributions show growth trends close to those observed. Re-evaluation of the growth data and correction for the bias result in significant positive growth trends of 1-2% per decade for the full period, and 3-7% since 1950. These observations, however, should be taken cautiously as multiple biases affect these trend estimates. In all, our results highlight that tree ring studies of long-term growth trends can be strongly influenced by biases if demographic processes are not carefully accounted for.
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Affiliation(s)
| | - Manuel Gloor
- School of GeographyUniversity of LeedsWoodhouse LaneLeedsLS2 9JTUK
| | - Guy Ziv
- School of GeographyUniversity of LeedsWoodhouse LaneLeedsLS2 9JTUK
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13
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Baker JCA, Santos GM, Gloor M, Brienen RJW. Does Cedrela always form annual rings? Testing ring periodicity across South America using radiocarbon dating. Trees (Berl West) 2017; 31:1999-2009. [PMID: 32009742 PMCID: PMC6959415 DOI: 10.1007/s00468-017-1604-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2017] [Accepted: 08/09/2017] [Indexed: 05/21/2023]
Abstract
KEY MESSAGE Radiocarbon dating shows that Cedrela trees from Bolivia, Ecuador and Venezuela form one ring per year but Cedrela trees from Suriname form two rings per year. ABSTRACT Tropical tree rings have the potential to yield valuable ecological and climate information, on the condition that rings are annual and accurately dated. It is important to understand the factors controlling ring formation, since regional variation in these factors could cause trees in different regions to form tree rings at different times. Here, we use 'bomb-peak' radiocarbon (14C) dating to test the periodicity of ring formation in Cedrela trees from four sites across tropical South America. We show that trees from Bolivia, Ecuador and Venezuela have reliably annual tree rings, while trees from Suriname regularly form two rings per year. This proves that while tree rings of a particular species may be demonstrably annual at one site, this does not imply that rings are formed annually in other locations. We explore possible drivers of variation in ring periodicity and find that Cedrela growth rhythms are most likely caused by precipitation seasonality, with a possible degree of genetic control. Therefore, tree-ring studies undertaken at new locations in the tropics require independent validation of the annual nature of tree rings, irrespective of how the studied species behaves in other locations.
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Affiliation(s)
| | | | - Manuel Gloor
- School of Geography, University of Leeds, Leeds, UK
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14
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Johnson MO, Galbraith D, Gloor M, De Deurwaerder H, Guimberteau M, Rammig A, Thonicke K, Verbeeck H, von Randow C, Monteagudo A, Phillips OL, Brienen RJW, Feldpausch TR, Lopez Gonzalez G, Fauset S, Quesada CA, Christoffersen B, Ciais P, Sampaio G, Kruijt B, Meir P, Moorcroft P, Zhang K, Alvarez‐Davila E, Alves de Oliveira A, Amaral I, Andrade A, Aragao LEOC, Araujo‐Murakami A, Arets EJMM, Arroyo L, Aymard GA, Baraloto C, Barroso J, Bonal D, Boot R, Camargo J, Chave J, Cogollo A, Cornejo Valverde F, Lola da Costa AC, Di Fiore A, Ferreira L, Higuchi N, Honorio EN, Killeen TJ, Laurance SG, Laurance WF, Licona J, Lovejoy T, Malhi Y, Marimon B, Marimon BH, Matos DCL, Mendoza C, Neill DA, Pardo G, Peña‐Claros M, Pitman NCA, Poorter L, Prieto A, Ramirez‐Angulo H, Roopsind A, Rudas A, Salomao RP, Silveira M, Stropp J, ter Steege H, Terborgh J, Thomas R, Toledo M, Torres‐Lezama A, van der Heijden GMF, Vasquez R, Guimarães Vieira IC, Vilanova E, Vos VA, Baker TR. Variation in stem mortality rates determines patterns of above-ground biomass in Amazonian forests: implications for dynamic global vegetation models. Glob Chang Biol 2016; 22:3996-4013. [PMID: 27082541 PMCID: PMC6849555 DOI: 10.1111/gcb.13315] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2015] [Revised: 02/05/2016] [Accepted: 03/01/2016] [Indexed: 05/05/2023]
Abstract
Understanding the processes that determine above-ground biomass (AGB) in Amazonian forests is important for predicting the sensitivity of these ecosystems to environmental change and for designing and evaluating dynamic global vegetation models (DGVMs). AGB is determined by inputs from woody productivity [woody net primary productivity (NPP)] and the rate at which carbon is lost through tree mortality. Here, we test whether two direct metrics of tree mortality (the absolute rate of woody biomass loss and the rate of stem mortality) and/or woody NPP, control variation in AGB among 167 plots in intact forest across Amazonia. We then compare these relationships and the observed variation in AGB and woody NPP with the predictions of four DGVMs. The observations show that stem mortality rates, rather than absolute rates of woody biomass loss, are the most important predictor of AGB, which is consistent with the importance of stand size structure for determining spatial variation in AGB. The relationship between stem mortality rates and AGB varies among different regions of Amazonia, indicating that variation in wood density and height/diameter relationships also influences AGB. In contrast to previous findings, we find that woody NPP is not correlated with stem mortality rates and is weakly positively correlated with AGB. Across the four models, basin-wide average AGB is similar to the mean of the observations. However, the models consistently overestimate woody NPP and poorly represent the spatial patterns of both AGB and woody NPP estimated using plot data. In marked contrast to the observations, DGVMs typically show strong positive relationships between woody NPP and AGB. Resolving these differences will require incorporating forest size structure, mechanistic models of stem mortality and variation in functional composition in DGVMs.
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Affiliation(s)
| | | | - Manuel Gloor
- School of GeographyUniversity of LeedsLeedsLS6 2QTUK
| | - Hannes De Deurwaerder
- CAVElab Computational & Applied Vegetation EcologyFaculty of Bioscience EngineeringGhent UniversityCoupure Links 653B‐9000GentBelgium
| | - Matthieu Guimberteau
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA‐CNRS‐UVSQUniversité Paris‐SaclayF‐91191Gif‐sur‐YvetteFrance
- UMR 7619 METISIPSL, Sorbonne Universités, UPMC, CNRS, EPHE75252ParisFrance
| | - Anja Rammig
- TUM School of Life Sciences WeihenstephanTechnical University MunichHans‐Carl‐von‐Carlowitz‐Platz 285354FreisingGermany
- Potsdam Institute for Climate Impact Research (PIK)Telegrafenberg A62PO Box 60 12 03D‐14412PotsdamGermany
| | - Kirsten Thonicke
- Potsdam Institute for Climate Impact Research (PIK)Telegrafenberg A62PO Box 60 12 03D‐14412PotsdamGermany
| | - Hans Verbeeck
- CAVElab Computational & Applied Vegetation EcologyFaculty of Bioscience EngineeringGhent UniversityCoupure Links 653B‐9000GentBelgium
| | - Celso von Randow
- INPEAv. Dos Astronautas, 1.758, Jd. GranjaCEP: 12227‐010Sao Jose dos CamposSPBrazil
| | - Abel Monteagudo
- Jardín Botánico de MissouriProlongacion Bolognesi Mz.e, Lote 6Oxapampa, PascoPeru
| | | | | | - Ted R. Feldpausch
- GeographyCollege of Life and Environmental SciencesUniversity of ExeterRennes DriveExeterEX4 4RJUK
| | | | - Sophie Fauset
- School of GeographyUniversity of LeedsLeedsLS6 2QTUK
| | | | - Bradley Christoffersen
- School of GeosciencesUniversity of EdinburghEdinburghEH9 3FFUK
- Earth and Environmental Sciences DivisionLos Alamos National LaboratoryPO Box 1663Los AlamosNM 87545USA
| | - Philippe Ciais
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA‐CNRS‐UVSQUniversité Paris‐SaclayF‐91191Gif‐sur‐YvetteFrance
| | - Gilvan Sampaio
- INPEAv. Dos Astronautas, 1.758, Jd. GranjaCEP: 12227‐010Sao Jose dos CamposSPBrazil
| | - Bart Kruijt
- ALTERRAWageningen‐URPO Box 476700 AAWageningenThe Netherlands
| | - Patrick Meir
- School of GeosciencesUniversity of EdinburghEdinburghEH9 3FFUK
- Research School of BiologyAustralian National UniversityCanberraACT0200Australia
| | - Paul Moorcroft
- Department of Organismic and Evolutionary BiologyHarvard University26 Oxford StreetCambridgeMA 02138USA
| | - Ke Zhang
- Cooperative Institute for Mesoscale Meteorological StudiesUniversity of Oklahoma National Weather Center Suite 2100120 David L. Boren BlvdNormanOK73072USA
| | | | | | - Ieda Amaral
- INPAAv. André Araújo, 2.936CEP 69067‐375Petrópolis, ManausAMBrazil
| | - Ana Andrade
- INPAAv. André Araújo, 2.936CEP 69067‐375Petrópolis, ManausAMBrazil
| | - Luiz E. O. C. Aragao
- Jardín Botánico de MissouriProlongacion Bolognesi Mz.e, Lote 6Oxapampa, PascoPeru
| | - Alejandro Araujo‐Murakami
- Museo de Historia Natural Noel Kempff MercadoUniversidad Autonoma Gabriel Rene MorenoCasilla 2489, Av. Irala 565Santa CruzBolivia
| | | | - Luzmila Arroyo
- Museo de Historia Natural Noel Kempff MercadoUniversidad Autonoma Gabriel Rene MorenoCasilla 2489, Av. Irala 565Santa CruzBolivia
| | - Gerardo A. Aymard
- UNELLEZ‐Guanare, Programa de Ciencias del Agro y el Mar, Herbario Universitario (PORT)Mesa de CavacasEstado Portuguesa3350Venezuela
| | - Christopher Baraloto
- Department of Biological SciencesInternational Center for Tropical Botany (ICTB)Florida International University112200 SW 8th Street, OE 167MiamiFL33199USA
| | - Jocely Barroso
- Universidade Federal do AcreCampus de Cruzeiro do SulRio BrancoBrazil
| | - Damien Bonal
- INRAUMR 1137 “Ecologie et Ecophysiologie Forestiere”54280ChampenouxFrance
| | - Rene Boot
- Tropenbos InternationalPO Box 2326700 AEWageningenThe Netherlands
| | - Jose Camargo
- INPAAv. André Araújo, 2.936CEP 69067‐375Petrópolis, ManausAMBrazil
| | - Jerome Chave
- Université Paul Sabatier CNRSUMR 5174 Evolution et Diversité Biologiquebâtiment 4R131062ToulouseFrance
| | - Alvaro Cogollo
- Jardín Botánico de Medellín Joaquín Antonio Uribe Calle 73 # 51 D 14 MedellínCartagenaColombia
| | | | | | - Anthony Di Fiore
- Department of AnthropologyUniversity of Texas at AustinSAC Room 5.1502201 Speedway Stop C3200AustinTX78712USA
| | - Leandro Ferreira
- Museu Paraense Emilio GoeldiAv. Magalhães Barata, 376 ‐ São BrazCEP: 66040‐170BelémPABrazil
| | - Niro Higuchi
- INPAAv. André Araújo, 2.936CEP 69067‐375Petrópolis, ManausAMBrazil
| | - Euridice N. Honorio
- Instituto de Investigaciones de la Amazonía PeruanaAv. José Quiñones km 2.5IquitosPerú
| | | | - Susan G. Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS) and College of Marine and Environmental SciencesJames Cook UniversityCairnsQld4878Australia
| | - William F. Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS) and College of Marine and Environmental SciencesJames Cook UniversityCairnsQld4878Australia
| | - Juan Licona
- Instituto Boliviano de Investigación ForestalC.P. 6201Santa Cruz de la SierraBolivia
| | - Thomas Lovejoy
- Environmental Science and Policy Department and the Department of Public and International Affairs at George Mason University (GMU)3351 Fairfax DriveArlingtonWashingtonDCVA 22201USA
| | - Yadvinder Malhi
- Environmental Change InstituteSchool of Geography and the EnvironmentUniversity of OxfordSouth Parks RoadOxfordOX1 3QYUK
| | - Bia Marimon
- Universidade do Estado de Mato GrossoCampus de Nova XavantinaCaixa Postal 08CEP 78.690‐000Nova XavantinaMTBrazil
| | - Ben Hur Marimon
- Universidade do Estado de Mato GrossoCampus de Nova XavantinaCaixa Postal 08CEP 78.690‐000Nova XavantinaMTBrazil
| | - Darley C. L. Matos
- Museu Paraense Emilio GoeldiAv. Magalhães Barata, 376 ‐ São BrazCEP: 66040‐170BelémPABrazil
| | - Casimiro Mendoza
- Escuela de Ciencias Forestales (ESFOR)Av. Final Atahuallpa s/nCasilla 447CochabambaBolivia
| | - David A. Neill
- Facultad de Ingeniería AmbientalUniversidad Estatal AmazónicaPaso lateral km 2 1/2 via NapoPuyoPastazaEcuador
| | - Guido Pardo
- Universidad Autonoma del BeniCampus UniversitarioAv. Ejército Nacional, finalRiberaltaBeniBolivia
| | - Marielos Peña‐Claros
- Instituto Boliviano de Investigación ForestalC.P. 6201Santa Cruz de la SierraBolivia
- Forest Ecology and Forest Management GroupWageningen UniversityPO Box 47Wageningen6700 AAThe Netherlands
| | - Nigel C. A. Pitman
- Center for Tropical ConservationDuke UniversityBox 90381DurhamNC27708USA
| | - Lourens Poorter
- Forest Ecology and Forest Management GroupWageningen UniversityPO Box 47Wageningen6700 AAThe Netherlands
| | - Adriana Prieto
- Doctorado Instituto de Ciencias NaturalesUniversidad Nacional de ColombiaBogotáColombia
| | - Hirma Ramirez‐Angulo
- Instituto de Investigaciones para el Desarrollo ForestalUniversidad de Los AndesAvenida Principal Chorros de MillaCampus Universitario ForestalEdificio PrincipalMéridaVenezuela
| | - Anand Roopsind
- Iwokrama International Centre for Rainforest Conservation and Development77 High Street KingstonGeorgetownGuyana
| | - Agustin Rudas
- Doctorado Instituto de Ciencias NaturalesUniversidad Nacional de ColombiaBogotáColombia
| | - Rafael P. Salomao
- Museu Paraense Emilio GoeldiAv. Magalhães Barata, 376 ‐ São BrazCEP: 66040‐170BelémPABrazil
| | - Marcos Silveira
- Museu UniversitárioUniversidade Federal do AcreRio BrancoAC69910‐900Brazil
| | - Juliana Stropp
- Institute of Biological and Health SciencesFederal University of AlagoasAv. Lourival Melo Mota s/nTabuleiro do Martins, MaceióAL 57072‐900Brazil
| | - Hans ter Steege
- Naturalis Biodiversity CenterPO Box 95172300 RALeidenThe Netherlands
| | - John Terborgh
- Center for Tropical ConservationDuke UniversityBox 90381DurhamNC27708USA
| | - Raquel Thomas
- Iwokrama International Centre for Rainforest Conservation and Development77 High Street KingstonGeorgetownGuyana
| | - Marisol Toledo
- Instituto Boliviano de Investigación ForestalC.P. 6201Santa Cruz de la SierraBolivia
| | - Armando Torres‐Lezama
- Instituto de Investigaciones para el Desarrollo ForestalUniversidad de Los AndesAvenida Principal Chorros de MillaCampus Universitario ForestalEdificio PrincipalMéridaVenezuela
| | | | - Rodolfo Vasquez
- GeographyCollege of Life and Environmental SciencesUniversity of ExeterRennes DriveExeterEX4 4RJUK
| | | | - Emilio Vilanova
- Instituto de Investigaciones para el Desarrollo ForestalUniversidad de Los AndesAvenida Principal Chorros de MillaCampus Universitario ForestalEdificio PrincipalMéridaVenezuela
| | - Vincent A. Vos
- Centro de Investigación y Promoción del Campesinado, regional Norte AmazónicoC/Nicanor Gonzalo Salvatierra N° 362Casilla 16RiberaltaBolivia
- Universidad Autónoma del BeniAvenida 6 de Agosto N° 64RiberaltaBolivia
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15
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Johnson MO, Galbraith D, Gloor M, De Deurwaerder H, Guimberteau M, Rammig A, Thonicke K, Verbeeck H, von Randow C, Monteagudo A, Phillips OL, Brienen RJW, Feldpausch TR, Lopez Gonzalez G, Fauset S, Quesada CA, Christoffersen B, Ciais P, Sampaio G, Kruijt B, Meir P, Moorcroft P, Zhang K, Alvarez-Davila E, Alves de Oliveira A, Amaral I, Andrade A, Aragao LEOC, Araujo-Murakami A, Arets EJMM, Arroyo L, Aymard GA, Baraloto C, Barroso J, Bonal D, Boot R, Camargo J, Chave J, Cogollo A, Cornejo Valverde F, Lola da Costa AC, Di Fiore A, Ferreira L, Higuchi N, Honorio EN, Killeen TJ, Laurance SG, Laurance WF, Licona J, Lovejoy T, Malhi Y, Marimon B, Marimon BH, Matos DCL, Mendoza C, Neill DA, Pardo G, Peña-Claros M, Pitman NCA, Poorter L, Prieto A, Ramirez-Angulo H, Roopsind A, Rudas A, Salomao RP, Silveira M, Stropp J, Ter Steege H, Terborgh J, Thomas R, Toledo M, Torres-Lezama A, van der Heijden GMF, Vasquez R, Guimarães Vieira IC, Vilanova E, Vos VA, Baker TR. Variation in stem mortality rates determines patterns of above-ground biomass in Amazonian forests: implications for dynamic global vegetation models. Glob Chang Biol 2016. [PMID: 27082541 DOI: 10.5521/forestplots.net/2016_2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Understanding the processes that determine above-ground biomass (AGB) in Amazonian forests is important for predicting the sensitivity of these ecosystems to environmental change and for designing and evaluating dynamic global vegetation models (DGVMs). AGB is determined by inputs from woody productivity [woody net primary productivity (NPP)] and the rate at which carbon is lost through tree mortality. Here, we test whether two direct metrics of tree mortality (the absolute rate of woody biomass loss and the rate of stem mortality) and/or woody NPP, control variation in AGB among 167 plots in intact forest across Amazonia. We then compare these relationships and the observed variation in AGB and woody NPP with the predictions of four DGVMs. The observations show that stem mortality rates, rather than absolute rates of woody biomass loss, are the most important predictor of AGB, which is consistent with the importance of stand size structure for determining spatial variation in AGB. The relationship between stem mortality rates and AGB varies among different regions of Amazonia, indicating that variation in wood density and height/diameter relationships also influences AGB. In contrast to previous findings, we find that woody NPP is not correlated with stem mortality rates and is weakly positively correlated with AGB. Across the four models, basin-wide average AGB is similar to the mean of the observations. However, the models consistently overestimate woody NPP and poorly represent the spatial patterns of both AGB and woody NPP estimated using plot data. In marked contrast to the observations, DGVMs typically show strong positive relationships between woody NPP and AGB. Resolving these differences will require incorporating forest size structure, mechanistic models of stem mortality and variation in functional composition in DGVMs.
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Affiliation(s)
| | - David Galbraith
- School of Geography, University of Leeds, Leeds, LS6 2QT, UK
| | - Manuel Gloor
- School of Geography, University of Leeds, Leeds, LS6 2QT, UK
| | - Hannes De Deurwaerder
- CAVElab Computational & Applied Vegetation Ecology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Matthieu Guimberteau
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France
- UMR 7619 METIS, IPSL, Sorbonne Universités, UPMC, CNRS, EPHE, 75252, Paris, France
| | - Anja Rammig
- TUM School of Life Sciences Weihenstephan, Technical University Munich, Hans-Carl-von-Carlowitz-Platz 2, 85354, Freising, Germany
- Potsdam Institute for Climate Impact Research (PIK), Telegrafenberg A62, PO Box 60 12 03, D-14412, Potsdam, Germany
| | - Kirsten Thonicke
- Potsdam Institute for Climate Impact Research (PIK), Telegrafenberg A62, PO Box 60 12 03, D-14412, Potsdam, Germany
| | - Hans Verbeeck
- CAVElab Computational & Applied Vegetation Ecology, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000, Gent, Belgium
| | - Celso von Randow
- INPE, Av. Dos Astronautas, 1.758, Jd. Granja, CEP: 12227-010, Sao Jose dos Campos, SP, Brazil
| | - Abel Monteagudo
- Jardín Botánico de Missouri, Prolongacion Bolognesi Mz.e, Lote 6, Oxapampa, Pasco, Peru
| | | | | | - Ted R Feldpausch
- Geography, College of Life and Environmental Sciences, University of Exeter, Rennes Drive, Exeter, EX4 4RJ, UK
| | | | - Sophie Fauset
- School of Geography, University of Leeds, Leeds, LS6 2QT, UK
| | - Carlos A Quesada
- INPA, Av. André Araújo, 2.936, CEP 69067-375, Petrópolis, Manaus, AM, Brazil
| | - Bradley Christoffersen
- School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FF, UK
- Earth and Environmental Sciences Division, Los Alamos National Laboratory, PO Box 1663, Los Alamos, NM, 87545, USA
| | - Philippe Ciais
- Laboratoire des Sciences du Climat et de l'Environnement, LSCE/IPSL, CEA-CNRS-UVSQ, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France
| | - Gilvan Sampaio
- INPE, Av. Dos Astronautas, 1.758, Jd. Granja, CEP: 12227-010, Sao Jose dos Campos, SP, Brazil
| | - Bart Kruijt
- ALTERRA, Wageningen-UR, PO Box 47, 6700 AA, Wageningen, The Netherlands
| | - Patrick Meir
- School of Geosciences, University of Edinburgh, Edinburgh, EH9 3FF, UK
- Research School of Biology, Australian National University, Canberra, ACT, 0200, Australia
| | - Paul Moorcroft
- Department of Organismic and Evolutionary Biology, Harvard University, 26 Oxford Street, Cambridge, MA, 02138, USA
| | - Ke Zhang
- Cooperative Institute for Mesoscale Meteorological Studies, University of Oklahoma, National Weather Center, Suite 2100, 120 David L. Boren Blvd, Norman, OK, 73072, USA
| | | | | | - Ieda Amaral
- INPA, Av. André Araújo, 2.936, CEP 69067-375, Petrópolis, Manaus, AM, Brazil
| | - Ana Andrade
- INPA, Av. André Araújo, 2.936, CEP 69067-375, Petrópolis, Manaus, AM, Brazil
| | - Luiz E O C Aragao
- Jardín Botánico de Missouri, Prolongacion Bolognesi Mz.e, Lote 6, Oxapampa, Pasco, Peru
| | - Alejandro Araujo-Murakami
- Museo de Historia Natural Noel Kempff Mercado, Universidad Autonoma Gabriel Rene Moreno, Casilla 2489, Av. Irala 565, Santa Cruz, Bolivia
| | - Eric J M M Arets
- ALTERRA, Wageningen-UR, PO Box 47, 6700 AA, Wageningen, The Netherlands
| | - Luzmila Arroyo
- Museo de Historia Natural Noel Kempff Mercado, Universidad Autonoma Gabriel Rene Moreno, Casilla 2489, Av. Irala 565, Santa Cruz, Bolivia
| | - Gerardo A Aymard
- UNELLEZ-Guanare, Programa de Ciencias del Agro y el Mar, Herbario Universitario (PORT), Mesa de Cavacas, Estado Portuguesa, 3350, Venezuela
| | - Christopher Baraloto
- Department of Biological Sciences, International Center for Tropical Botany (ICTB), Florida International University, 112200 SW 8th Street, OE 167, Miami, FL, 33199, USA
| | - Jocely Barroso
- Universidade Federal do Acre, Campus de Cruzeiro do Sul, Rio Branco, Brazil
| | - Damien Bonal
- INRA, UMR 1137 "Ecologie et Ecophysiologie Forestiere", 54280, Champenoux, France
| | - Rene Boot
- Tropenbos International, PO Box 232, 6700 AE, Wageningen, The Netherlands
| | - Jose Camargo
- INPA, Av. André Araújo, 2.936, CEP 69067-375, Petrópolis, Manaus, AM, Brazil
| | - Jerome Chave
- Université Paul Sabatier CNRS, UMR 5174 Evolution et Diversité Biologique, bâtiment 4R1, 31062, Toulouse, France
| | - Alvaro Cogollo
- Jardín Botánico de Medellín Joaquín Antonio Uribe, Calle 73 # 51 D 14 Medellín, Cartagena, Colombia
| | | | | | - Anthony Di Fiore
- Department of Anthropology, University of Texas at Austin, SAC Room 5.150, 2201 Speedway Stop C3200, Austin, TX, 78712, USA
| | - Leandro Ferreira
- Museu Paraense Emilio Goeldi, Av. Magalhães Barata, 376 - São Braz, CEP: 66040-170, Belém, PA, Brazil
| | - Niro Higuchi
- INPA, Av. André Araújo, 2.936, CEP 69067-375, Petrópolis, Manaus, AM, Brazil
| | - Euridice N Honorio
- Instituto de Investigaciones de la Amazonía Peruana, Av. José Quiñones km 2.5, Iquitos, Perú
| | - Tim J Killeen
- World Wildlife Fund, 1250 24th St NW, Washington, DC, 20037, USA
| | - Susan G Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS) and College of Marine and Environmental Sciences, James Cook University, Cairns, Qld, 4878, Australia
| | - William F Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS) and College of Marine and Environmental Sciences, James Cook University, Cairns, Qld, 4878, Australia
| | - Juan Licona
- Instituto Boliviano de Investigación Forestal, C.P. 6201, Santa Cruz de la Sierra, Bolivia
| | - Thomas Lovejoy
- Environmental Science and Policy Department and the Department of Public and International Affairs at George Mason University (GMU), 3351 Fairfax Drive, Arlington, Washington, DC, VA 22201, USA
| | - Yadvinder Malhi
- Environmental Change Institute, School of Geography and the Environment, University of Oxford, South Parks Road, Oxford, OX1 3QY, UK
| | - Bia Marimon
- Universidade do Estado de Mato Grosso, Campus de Nova Xavantina, Caixa Postal 08, CEP 78.690-000, Nova Xavantina, MT, Brazil
| | - Ben Hur Marimon
- Universidade do Estado de Mato Grosso, Campus de Nova Xavantina, Caixa Postal 08, CEP 78.690-000, Nova Xavantina, MT, Brazil
| | - Darley C L Matos
- Museu Paraense Emilio Goeldi, Av. Magalhães Barata, 376 - São Braz, CEP: 66040-170, Belém, PA, Brazil
| | - Casimiro Mendoza
- Escuela de Ciencias Forestales (ESFOR), Av. Final Atahuallpa s/n, Casilla 447, Cochabamba, Bolivia
| | - David A Neill
- Facultad de Ingeniería Ambiental, Universidad Estatal Amazónica, Paso lateral km 2 1/2 via Napo, Puyo, Pastaza, Ecuador
| | - Guido Pardo
- Universidad Autonoma del Beni, Campus Universitario, Av. Ejército Nacional, final, Riberalta, Beni, Bolivia
| | - Marielos Peña-Claros
- Instituto Boliviano de Investigación Forestal, C.P. 6201, Santa Cruz de la Sierra, Bolivia
- Forest Ecology and Forest Management Group, Wageningen University, PO Box 47, Wageningen, 6700 AA, The Netherlands
| | - Nigel C A Pitman
- Center for Tropical Conservation, Duke University, Box 90381, Durham, NC, 27708, USA
| | - Lourens Poorter
- Forest Ecology and Forest Management Group, Wageningen University, PO Box 47, Wageningen, 6700 AA, The Netherlands
| | - Adriana Prieto
- Doctorado Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá, Colombia
| | - Hirma Ramirez-Angulo
- Instituto de Investigaciones para el Desarrollo Forestal, Universidad de Los Andes, Avenida Principal Chorros de Milla, Campus Universitario Forestal, Edificio Principal, Mérida, Venezuela
| | - Anand Roopsind
- Iwokrama International Centre for Rainforest Conservation and Development, 77 High Street Kingston, Georgetown, Guyana
| | - Agustin Rudas
- Doctorado Instituto de Ciencias Naturales, Universidad Nacional de Colombia, Bogotá, Colombia
| | - Rafael P Salomao
- Museu Paraense Emilio Goeldi, Av. Magalhães Barata, 376 - São Braz, CEP: 66040-170, Belém, PA, Brazil
| | - Marcos Silveira
- Museu Universitário, Universidade Federal do Acre, Rio Branco, AC, 69910-900, Brazil
| | - Juliana Stropp
- Institute of Biological and Health Sciences, Federal University of Alagoas, Av. Lourival Melo Mota s/n, Tabuleiro do Martins, Maceió, AL 57072-900, Brazil
| | - Hans Ter Steege
- Naturalis Biodiversity Center, PO Box 9517, 2300 RA, Leiden, The Netherlands
| | - John Terborgh
- Center for Tropical Conservation, Duke University, Box 90381, Durham, NC, 27708, USA
| | - Raquel Thomas
- Iwokrama International Centre for Rainforest Conservation and Development, 77 High Street Kingston, Georgetown, Guyana
| | - Marisol Toledo
- Instituto Boliviano de Investigación Forestal, C.P. 6201, Santa Cruz de la Sierra, Bolivia
| | - Armando Torres-Lezama
- Instituto de Investigaciones para el Desarrollo Forestal, Universidad de Los Andes, Avenida Principal Chorros de Milla, Campus Universitario Forestal, Edificio Principal, Mérida, Venezuela
| | | | - Rodolfo Vasquez
- Geography, College of Life and Environmental Sciences, University of Exeter, Rennes Drive, Exeter, EX4 4RJ, UK
| | | | - Emilio Vilanova
- Instituto de Investigaciones para el Desarrollo Forestal, Universidad de Los Andes, Avenida Principal Chorros de Milla, Campus Universitario Forestal, Edificio Principal, Mérida, Venezuela
| | - Vincent A Vos
- Centro de Investigación y Promoción del Campesinado, regional Norte Amazónico, C/Nicanor Gonzalo Salvatierra N° 362, Casilla 16, Riberalta, Bolivia
- Universidad Autónoma del Beni, Avenida 6 de Agosto N° 64, Riberalta, Bolivia
| | - Timothy R Baker
- School of Geography, University of Leeds, Leeds, LS6 2QT, UK
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O'Sullivan M, Rap A, Reddington CL, Spracklen DV, Gloor M, Buermann W. Small global effect on terrestrial net primary production due to increased fossil fuel aerosol emissions from East Asia since the turn of the century. Geophys Res Lett 2016; 43:8060-8067. [PMID: 27773953 PMCID: PMC5053272 DOI: 10.1002/2016gl068965] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2016] [Revised: 07/23/2016] [Accepted: 07/25/2016] [Indexed: 05/15/2023]
Abstract
The global terrestrial carbon sink has increased since the start of this century at a time of growing carbon emissions from fossil fuel burning. Here we test the hypothesis that increases in atmospheric aerosols from fossil fuel burning enhanced the diffuse light fraction and the efficiency of plant carbon uptake. Using a combination of models, we estimate that at global scale changes in light regimes from fossil fuel aerosol emissions had only a small negative effect on the increase in terrestrial net primary production over the period 1998-2010. Hereby, the substantial increases in fossil fuel aerosol emissions and plant carbon uptake over East Asia were effectively canceled by opposing trends across Europe and North America. This suggests that if the recent increase in the land carbon sink would be causally linked to fossil fuel emissions, it is unlikely via the effect of aerosols but due to other factors such as nitrogen deposition or nitrogen-carbon interactions.
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Affiliation(s)
- M. O'Sullivan
- Institute for Climate and Atmospheric Science, School of Earth and EnvironmentUniversity of LeedsLeedsUK
| | - A. Rap
- Institute for Climate and Atmospheric Science, School of Earth and EnvironmentUniversity of LeedsLeedsUK
| | - C. L. Reddington
- Institute for Climate and Atmospheric Science, School of Earth and EnvironmentUniversity of LeedsLeedsUK
| | - D. V. Spracklen
- Institute for Climate and Atmospheric Science, School of Earth and EnvironmentUniversity of LeedsLeedsUK
| | - M. Gloor
- School of GeographyUniversity of LeedsLeedsUK
| | - W. Buermann
- Institute for Climate and Atmospheric Science, School of Earth and EnvironmentUniversity of LeedsLeedsUK
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Basso LS, Gatti LV, Gloor M, Miller JB, Domingues LG, Correia CSC, Borges VF. Seasonality and interannual variability of CH 4 fluxes from the eastern Amazon Basin inferred from atmospheric mole fraction profiles. J Geophys Res Atmos 2016; 121:168-184. [PMID: 27642546 PMCID: PMC4994771 DOI: 10.1002/2015jd023874] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2015] [Revised: 11/20/2015] [Accepted: 11/20/2015] [Indexed: 05/28/2023]
Abstract
The Amazon Basin is an important region for global CH4 emissions. It hosts the largest area of humid tropical forests, and around 20% of this area is seasonally flooded. In a warming climate it is possible that CH4 emissions from the Amazon will increase both as a result of increased temperatures and precipitation. To examine if there are indications of first signs of such changes we present here a 13 year (2000-2013) record of regularly measured vertical CH4 mole fraction profiles above the eastern Brazilian Amazon, sensitive to fluxes from the region upwind of Santarém (SAN), between SAN and the Atlantic coast. Using a simple mass balance approach, we find substantial CH4 emissions with an annual average flux of 52.8 ± 6.8 mg CH4 m-2 d-1 over an area of approximately 1 × 106 km2. Fluxes are highest in two periods of the year: in the beginning of the wet season and during the dry season. Using a CO:CH4 emission factor estimated from the profile data, we estimated a contribution of biomass burning of around 15% to the total flux in the dry season, indicating that biogenic emissions dominate the CH4 flux. This 13 year record shows that CH4 emissions upwind of SAN varied over the years, with highest emissions in 2008 (around 25% higher than in 2007), mainly during the wet season, representing 19% of the observed global increase in this year.
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Affiliation(s)
- Luana S Basso
- Atmospheric Chemistry Laboratory, Instituto de Pesquisas Energéticas e Nucleares Comissão Nacional de Energia Nuclear São Paulo Brazil
| | - Luciana V Gatti
- Atmospheric Chemistry Laboratory, Instituto de Pesquisas Energéticas e Nucleares Comissão Nacional de Energia Nuclear São Paulo Brazil
| | - Manuel Gloor
- School of Geography University of Leeds Leeds UK
| | - John B Miller
- Global Monitoring Division, Earth System Research Laboratory National Oceanic and Atmospheric Administration Boulder Colorado USA
| | - Lucas G Domingues
- Atmospheric Chemistry Laboratory, Instituto de Pesquisas Energéticas e Nucleares Comissão Nacional de Energia Nuclear São Paulo Brazil
| | - Caio S C Correia
- Atmospheric Chemistry Laboratory, Instituto de Pesquisas Energéticas e Nucleares Comissão Nacional de Energia Nuclear São Paulo Brazil
| | - Viviane F Borges
- Atmospheric Chemistry Laboratory, Instituto de Pesquisas Energéticas e Nucleares Comissão Nacional de Energia Nuclear São Paulo Brazil
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Anderson LO, Aragão LEOC, Gloor M, Arai E, Adami M, Saatchi SS, Malhi Y, Shimabukuro YE, Barlow J, Berenguer E, Duarte V. Disentangling the contribution of multiple land covers to fire-mediated carbon emissions in Amazonia during the 2010 drought. Global Biogeochem Cycles 2015; 29:1739-1753. [PMID: 27610002 PMCID: PMC4994379 DOI: 10.1002/2014gb005008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 07/28/2015] [Accepted: 09/02/2015] [Indexed: 05/06/2023]
Abstract
In less than 15 years, the Amazon region experienced three major droughts. Links between droughts and fires have been demonstrated for the 1997/1998, 2005, and 2010 droughts. In 2010, emissions of 510 ± 120 Tg C were associated to fire alone in Amazonia. Existing approaches have, however, not yet disentangled the proportional contribution of multiple land cover sources to this total. We develop a novel integration of multisensor and multitemporal satellite-derived data on land cover, active fires, and burned area and an empirical model of fire-induced biomass loss to quantify the extent of burned areas and resulting biomass loss for multiple land covers in Mato Grosso (MT) state, southern Amazonia-the 2010 drought most impacted region. We show that 10.77% (96,855 km2) of MT burned. We estimated a gross carbon emission of 56.21 ± 22.5 Tg C from direct combustion of biomass, with an additional 29.4 ± 10 Tg C committed to be emitted in the following years due to dead wood decay. It is estimated that old-growth forest fires in the whole Brazilian Legal Amazon (BLA) have contributed to 14.81 Tg of C (11.75 Tg C to 17.87 Tg C) emissions to the atmosphere during the 2010 fire season, with an affected area of 27,555 km2. Total C loss from the 2010 fires in MT state and old-growth forest fires in the BLA represent, respectively, 77% (47% to 107%) and 86% (68.2% to 103%) of Brazil's National Plan on Climate Change annual target for Amazonia C emission reductions from deforestation.
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Affiliation(s)
- Liana Oighenstein Anderson
- National Center for Monitoring and Early Warning of Natural Disasters São José dos Campos Brazil; Environmental Change Institute University of Oxford Oxford UK; Remote Sensing Division National Institute for Space Research São José dos Campos Brazil
| | - Luiz E O C Aragão
- Remote Sensing Division National Institute for Space Research São José dos Campos Brazil; College of Life and Environmental Sciences University of Exeter Exeter UK
| | - Manuel Gloor
- School of Geography University of Leeds Leeds UK
| | - Egídio Arai
- Remote Sensing Division National Institute for Space Research São José dos Campos Brazil
| | - Marcos Adami
- Remote Sensing Division National Institute for Space Research São José dos Campos Brazil
| | - Sassan S Saatchi
- Jet Propulsion Laboratory California Institute of Technology Pasadena California USA; Institute of Environment University of California Los Angeles California USA
| | - Yadvinder Malhi
- Environmental Change Institute University of Oxford Oxford UK
| | - Yosio E Shimabukuro
- Remote Sensing Division National Institute for Space Research São José dos Campos Brazil
| | - Jos Barlow
- Lancaster Environment Centre Lancaster University Lancaster UK
| | - Erika Berenguer
- Lancaster Environment Centre Lancaster University Lancaster UK
| | - Valdete Duarte
- Remote Sensing Division National Institute for Space Research São José dos Campos Brazil
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Anderson LO, Aragão LEOC, Gloor M, Arai E, Adami M, Saatchi SS, Malhi Y, Shimabukuro YE, Barlow J, Berenguer E, Duarte V. Disentangling the contribution of multiple land covers to fire-mediated carbon emissions in Amazonia during the 2010 drought. Global Biogeochem Cycles 2015; 29:1739-1753. [PMID: 27610002 DOI: 10.1002/2014gb005008.received] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 07/28/2015] [Accepted: 09/02/2015] [Indexed: 05/23/2023]
Abstract
In less than 15 years, the Amazon region experienced three major droughts. Links between droughts and fires have been demonstrated for the 1997/1998, 2005, and 2010 droughts. In 2010, emissions of 510 ± 120 Tg C were associated to fire alone in Amazonia. Existing approaches have, however, not yet disentangled the proportional contribution of multiple land cover sources to this total. We develop a novel integration of multisensor and multitemporal satellite-derived data on land cover, active fires, and burned area and an empirical model of fire-induced biomass loss to quantify the extent of burned areas and resulting biomass loss for multiple land covers in Mato Grosso (MT) state, southern Amazonia-the 2010 drought most impacted region. We show that 10.77% (96,855 km2) of MT burned. We estimated a gross carbon emission of 56.21 ± 22.5 Tg C from direct combustion of biomass, with an additional 29.4 ± 10 Tg C committed to be emitted in the following years due to dead wood decay. It is estimated that old-growth forest fires in the whole Brazilian Legal Amazon (BLA) have contributed to 14.81 Tg of C (11.75 Tg C to 17.87 Tg C) emissions to the atmosphere during the 2010 fire season, with an affected area of 27,555 km2. Total C loss from the 2010 fires in MT state and old-growth forest fires in the BLA represent, respectively, 77% (47% to 107%) and 86% (68.2% to 103%) of Brazil's National Plan on Climate Change annual target for Amazonia C emission reductions from deforestation.
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Affiliation(s)
- Liana Oighenstein Anderson
- National Center for Monitoring and Early Warning of Natural Disasters São José dos Campos Brazil; Environmental Change Institute University of Oxford Oxford UK; Remote Sensing Division National Institute for Space Research São José dos Campos Brazil
| | - Luiz E O C Aragão
- Remote Sensing Division National Institute for Space Research São José dos Campos Brazil; College of Life and Environmental Sciences University of Exeter Exeter UK
| | - Manuel Gloor
- School of Geography University of Leeds Leeds UK
| | - Egídio Arai
- Remote Sensing Division National Institute for Space Research São José dos Campos Brazil
| | - Marcos Adami
- Remote Sensing Division National Institute for Space Research São José dos Campos Brazil
| | - Sassan S Saatchi
- Jet Propulsion Laboratory California Institute of Technology Pasadena California USA; Institute of Environment University of California Los Angeles California USA
| | - Yadvinder Malhi
- Environmental Change Institute University of Oxford Oxford UK
| | - Yosio E Shimabukuro
- Remote Sensing Division National Institute for Space Research São José dos Campos Brazil
| | - Jos Barlow
- Lancaster Environment Centre Lancaster University Lancaster UK
| | - Erika Berenguer
- Lancaster Environment Centre Lancaster University Lancaster UK
| | - Valdete Duarte
- Remote Sensing Division National Institute for Space Research São José dos Campos Brazil
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20
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Affiliation(s)
- A M Grunewald
- Dermatological Clinic of Karlsruhe Municipal Hospital, Germany
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21
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Espírito-Santo FDB, Gloor M, Keller M, Malhi Y, Saatchi S, Nelson B, Oliveira Junior RC, Pereira C, Lloyd J, Frolking S, Palace M, Shimabukuro YE, Duarte V, Mendoza AM, López-González G, Baker TR, Feldpausch TR, Brienen RJW, Asner GP, Boyd DS, Phillips OL. Corrigendum: Size and frequency of natural forest disturbances and the Amazon forest carbon balance. Nat Commun 2015; 6:6638. [PMID: 25833221 PMCID: PMC4396392 DOI: 10.1038/ncomms7638] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
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22
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Mitchard ETA, Feldpausch TR, Brienen RJW, Lopez-Gonzalez G, Monteagudo A, Baker TR, Lewis SL, Lloyd J, Quesada CA, Gloor M, ter Steege H, Meir P, Alvarez E, Araujo-Murakami A, Aragão LEOC, Arroyo L, Aymard G, Banki O, Bonal D, Brown S, Brown FI, Cerón CE, Chama Moscoso V, Chave J, Comiskey JA, Cornejo F, Corrales Medina M, Da Costa L, Costa FRC, Di Fiore A, Domingues TF, Erwin TL, Frederickson T, Higuchi N, Honorio Coronado EN, Killeen TJ, Laurance WF, Levis C, Magnusson WE, Marimon BS, Marimon Junior BH, Mendoza Polo I, Mishra P, Nascimento MT, Neill D, Núñez Vargas MP, Palacios WA, Parada A, Pardo Molina G, Peña-Claros M, Pitman N, Peres CA, Poorter L, Prieto A, Ramirez-Angulo H, Restrepo Correa Z, Roopsind A, Roucoux KH, Rudas A, Salomão RP, Schietti J, Silveira M, de Souza PF, Steininger MK, Stropp J, Terborgh J, Thomas R, Toledo M, Torres-Lezama A, van Andel TR, van der Heijden GMF, Vieira ICG, Vieira S, Vilanova-Torre E, Vos VA, Wang O, Zartman CE, Malhi Y, Phillips OL. Markedly divergent estimates of Amazon forest carbon density from ground plots and satellites. Glob Ecol Biogeogr 2014; 23:935-946. [PMID: 26430387 PMCID: PMC4579864 DOI: 10.1111/geb.12168] [Citation(s) in RCA: 73] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
AIM The accurate mapping of forest carbon stocks is essential for understanding the global carbon cycle, for assessing emissions from deforestation, and for rational land-use planning. Remote sensing (RS) is currently the key tool for this purpose, but RS does not estimate vegetation biomass directly, and thus may miss significant spatial variations in forest structure. We test the stated accuracy of pantropical carbon maps using a large independent field dataset. LOCATION Tropical forests of the Amazon basin. The permanent archive of the field plot data can be accessed at: http://dx.doi.org/10.5521/FORESTPLOTS.NET/2014_1. METHODS Two recent pantropical RS maps of vegetation carbon are compared to a unique ground-plot dataset, involving tree measurements in 413 large inventory plots located in nine countries. The RS maps were compared directly to field plots, and kriging of the field data was used to allow area-based comparisons. RESULTS The two RS carbon maps fail to capture the main gradient in Amazon forest carbon detected using 413 ground plots, from the densely wooded tall forests of the north-east, to the light-wooded, shorter forests of the south-west. The differences between plots and RS maps far exceed the uncertainties given in these studies, with whole regions over- or under-estimated by > 25%, whereas regional uncertainties for the maps were reported to be < 5%. MAIN CONCLUSIONS Pantropical biomass maps are widely used by governments and by projects aiming to reduce deforestation using carbon offsets, but may have significant regional biases. Carbon-mapping techniques must be revised to account for the known ecological variation in tree wood density and allometry to create maps suitable for carbon accounting. The use of single relationships between tree canopy height and above-ground biomass inevitably yields large, spatially correlated errors. This presents a significant challenge to both the forest conservation and remote sensing communities, because neither wood density nor species assemblages can be reliably mapped from space.
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Affiliation(s)
- Edward T A Mitchard
- School of GeoSciences, University of EdinburghEdinburgh, EH9 3JN, UK
- *Correspondence: Edward T. A. Mitchard, School of GeoSciences, University of Edinburgh, Crew Building, The King's Buildings, Edinburgh, EH9 3JN, UK., E-mail:
| | - Ted R Feldpausch
- School of Geography, University of LeedsLeeds, LS2 9JT, UK
- Geography, College of Life and Environmental Sciences, University of ExeterExeter, EX4 4RJ, UK
| | | | | | | | | | - Simon L Lewis
- School of Geography, University of LeedsLeeds, LS2 9JT, UK
- Department of Geography, University College LondonUK
| | - Jon Lloyd
- Faculty of Natural Sciences, Department of Life Sciences, Imperial CollegeLondon, UK
| | | | - Manuel Gloor
- School of Geography, University of LeedsLeeds, LS2 9JT, UK
| | - Hans ter Steege
- Naturalis Biodiversity CenterLeiden, the Netherlands
- Institute of Environmental Biology, Utrecht UniversityUtrecht, the Netherlands
| | - Patrick Meir
- School of GeoSciences, University of EdinburghEdinburgh, EH9 3JN, UK
- Research School of Biology, Australian National UniversityCanberra, ACT, 0200, Australia
| | - Esteban Alvarez
- Jardín Botánico de Medellín, Grupo de Investigación en Servicios Ecosistémicos y Cambio ClimáticoMedellin, Colombia
| | - Alejandro Araujo-Murakami
- Museo de Historia Natural Noel Kempff Mercado, Universidad Autónoma Gabriel René MorenoCasilla 2489, Av. Irala 565, Santa Cruz, Bolivia
| | - Luiz E O C Aragão
- Geography, College of Life and Environmental Sciences, University of ExeterExeter, EX4 4RJ, UK
- Remote Sensing Division, National Institute for Space Research – INPESão José dos Campos, SP, Brazil
| | - Luzmila Arroyo
- Museo de Historia Natural Noel Kempff Mercado, Universidad Autónoma Gabriel René MorenoCasilla 2489, Av. Irala 565, Santa Cruz, Bolivia
| | - Gerardo Aymard
- UNELLEZ-Guanare, Programa de Ciencias del Agro y el Mar, Herbario Universitario (PORT)Mesa de Cavacas, Estado Portuguesa, 3350, Venezuela
| | - Olaf Banki
- IBED, University of AmsterdamPOSTBUS 94248, 1090 GE, Amsterdam, the Netherlands
| | - Damien Bonal
- L'Institut National de la Recherche AgronomiqueUMR 1137 EEF, 54280, Champenoux, France
| | - Sandra Brown
- Ecosystem Services Unit, Winrock InternationalArlington, VA, 22202, USA
| | - Foster I Brown
- Woods Hole Research CenterFalmouth, MA, USA
- Universidade Federal do Acre, Centro de Ciências Biológicas e da NaturezaRio Branco, AC, 69910-900, Brazil
| | - Carlos E Cerón
- Herbario Alfredo Paredes (QAP), Universidad Central del EcuadorQuito, Ecuador
| | | | - Jerome Chave
- Université Paul Sabatier, Laboratoire EDBbâtiment 4R3, 31062, Toulouse, France
| | | | - Fernando Cornejo
- Universidad Nacional Agraria La Molina, Facultad de Ciencias ForestalesLima, Peru
| | | | - Lola Da Costa
- Geociencias, Universidade Federal de ParaBelem, Brazil
| | | | | | - Tomas F Domingues
- FFCLRP-USP, Department of Biology, Universidade de São Paulo05508-090, Brazil
| | - Terry L Erwin
- Department of Entomology, Smithsonian InstitutionP.O. Box 37012, MRC 187, Washington, DC, 20013-7012, USA
| | | | - Niro Higuchi
- Instituto Nacional de Pesquisas da AmazôniaManaus, Brazil
| | - Euridice N Honorio Coronado
- School of Geography, University of LeedsLeeds, LS2 9JT, UK
- Instituto de Investigaciones de la Amazonía PeruanaAv. José A. Quiñones km. 2.5, Iquitos, Peru
| | - Tim J Killeen
- World Wildlife Fund1250 24th Street, N.W., Washington, DC, 20037, USA
| | - William F Laurance
- Centre for Tropical Environmental and Sustainability Science (TESS), School of Marine and Tropical Biology, James Cook UniversityCairns, Queensland, 4878, Australia
| | - Carolina Levis
- Instituto Nacional de Pesquisas da AmazôniaManaus, Brazil
| | | | - Beatriz S Marimon
- Universidade do Estado de Mato Grosso, Campus de Nova XavantinaCaixa Postal 08, CEP 78.690-000, Nova Xavantina, MT, Brazil
| | - Ben Hur Marimon Junior
- Universidade do Estado de Mato Grosso, Campus de Nova XavantinaCaixa Postal 08, CEP 78.690-000, Nova Xavantina, MT, Brazil
| | - Irina Mendoza Polo
- Jardín Botánico de Medellín, Grupo de Investigación en Servicios Ecosistémicos y Cambio ClimáticoMedellin, Colombia
| | - Piyush Mishra
- Department of Civil Engineering, Indian Institute of TechnologyRoorkee, Uttarakhand, 247667, India
| | - Marcelo T Nascimento
- Centro de Biociências e Biotecnologia, Universidade Estadual do Norte FlumineseCampos dos Goytacazes, RJ, Brasil
| | - David Neill
- Puyo, Universidad Estatal AmazónicaPaso lateral km 2½ via a Napo, Pastaza, Ecuador
| | | | - Walter A Palacios
- Escuela de Ingeniería Forestal, Universidad Técnica del NorteEcuador
| | - Alexander Parada
- Museo de Historia Natural Noel Kempff Mercado, Universidad Autónoma Gabriel René MorenoCasilla 2489, Av. Irala 565, Santa Cruz, Bolivia
| | | | - Marielos Peña-Claros
- Forest Ecology and Forest Management Group, Wageningen UniversityP.O. Box 47, 6700 AA, Wageningen, the Netherlands
- Instituto Boliviano de Investigación ForestalSanta Cruz, Bolivia
| | - Nigel Pitman
- Center for Tropical Conservation, Duke UniversityBox 90381, Durham, NC, 27708, USA
| | - Carlos A Peres
- Centre for Biodiversity Research, School of Environmental Sciences, University of East AngliaNorwich, NR4 7JT, UK
| | - Lourens Poorter
- Forest Ecology and Forest Management Group, Wageningen UniversityP.O. Box 47, 6700 AA, Wageningen, the Netherlands
| | - Adriana Prieto
- Instituto de Ciencias Naturales, Universidad Nacional de ColombiaBogota, Colombia
| | | | - Zorayda Restrepo Correa
- Jardín Botánico de Medellín, Grupo de Investigación en Servicios Ecosistémicos y Cambio ClimáticoMedellin, Colombia
| | - Anand Roopsind
- Department of Biology, University of FloridaP.O. 118526, 511 Bartram Hall, Gainesville, FL, 32611-8526, USA
| | | | | | - Rafael P Salomão
- Museu Paraense Emilio GoeldiAv. Magalhães Barata, 376, São Braz, 66040-170, Belém, PA, Brazil
| | | | - Marcos Silveira
- Universidade Federal do Acre, Centro de Ciências Biológicas e da NaturezaRio Branco, AC, 69910-900, Brazil
| | | | - Marc K Steininger
- Center for Applied Biodiversity Science, Conservation InternationalWashington, DC, USA
| | - Juliana Stropp
- Institute for Environment and Sustainability, Joint Research Centre of the European CommissionVia Enrico Fermi, 2748 TP 440, I-21027, Ispra, Italy
| | - John Terborgh
- Nicholas School of the Environment, Duke UniversityBox 90381, Durham, NC, 27708, USA
| | - Raquel Thomas
- Iwokrama International Centre77 High Street Kingston, Georgetown, Guyana
| | - Marisol Toledo
- Instituto Boliviano de Investigación ForestalSanta Cruz, Bolivia
- Universidad Autónoma Gabriel René MorenoSanta Cruz, Bolivia
| | | | | | - Geertje M F van der Heijden
- University of Wisconsin-MilwaukeeP.O Box 413, Milwaukee, WI, 53201, USA
- Smithsonian Tropical Research InstituteApartado, Postal 0843-03092, Panamá, Panama
| | - Ima C G Vieira
- Museu Paraense Emilio GoeldiAv. Magalhães Barata, 376, São Braz, 66040-170, Belém, PA, Brazil
| | - Simone Vieira
- Núcleo de Estudos e Pesquisas Ambientais, Universidade Estadual de CampinasCampinas, Brazil
| | | | - Vincent A Vos
- Escuela de Ingeniería Forestal, Universidad Técnica del NorteEcuador
| | - Ophelia Wang
- Lab of Landscape Ecology and Conservation Biology, Northern Arizona UniversityFlagstaff, AZ, USA
| | | | - Yadvinder Malhi
- School of Geography and the Environment, University of OxfordOxford, UK
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Hafner P, Bonati U, Neuhaus C, Rutz E, Frank S, Erne B, Gloor M, Fischmann A, Sinnreich M, Fischer D. O7: Successful pilot trial of L-arginine and metformin in Duchenne’s muscular dystrophy. Clin Neurophysiol 2014. [DOI: 10.1016/s1388-2457(14)50113-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Brienen RJW, Hietz P, Wanek W, Gloor M. Oxygen isotopes in tree rings record variation in precipitation δ18O and amount effects in the south of Mexico. J Geophys Res Biogeosci 2013; 118:1604-1615. [PMID: 26213660 PMCID: PMC4508921 DOI: 10.1002/2013jg002304] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2013] [Revised: 10/25/2013] [Accepted: 10/31/2013] [Indexed: 06/06/2023]
Abstract
[1] Natural archives of oxygen isotopes in precipitation may be used to study changes in the hydrological cycle in the tropics, but their interpretation is not straightforward. We studied to which degree tree rings of Mimosa acantholoba from southern Mexico record variation in isotopic composition of precipitation and which climatic processes influence oxygen isotopes in tree rings (δ18Otr). Interannual variation in δ18Otr was highly synchronized between trees and closely related to isotopic composition of rain measured at San Salvador, 710 km to the southwest. Correlations with δ13C, growth, or local climate variables (temperature, cloud cover, vapor pressure deficit (VPD)) were relatively low, indicating weak plant physiological influences. Interannual variation in δ18Otr correlated negatively with local rainfall amount and intensity. Correlations with the amount of precipitation extended along a 1000 km long stretch of the Pacific Central American coast, probably as a result of organized storm systems uniformly affecting rainfall in the region and its isotope signal; episodic heavy precipitation events, of which some are related to cyclones, deposit strongly 18O-depleted rain in the region and seem to have affected the δ18Otr signal. Large-scale controls on the isotope signature include variation in sea surface temperatures of tropical north Atlantic and Pacific Ocean. In conclusion, we show that δ18Otr of M. acantholoba can be used as a proxy for source water δ18O and that interannual variation in δ18Oprec is caused by a regional amount effect. This contrasts with δ18O signatures at continental sites where cumulative rainout processes dominate and thus provide a proxy for precipitation integrated over a much larger scale. Our results confirm that processes influencing climate-isotope relations differ between sites located, e.g., in the western Amazon versus coastal Mexico, and that tree ring isotope records can help in disentangling the processes influencing precipitation δ18O.
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Affiliation(s)
- Roel J W Brienen
- Earth and Global Change, School of Geography, University of LeedsLeeds, UK
- Centro de Investigaciones en Ecosistemas, Universidad Nacional Autónoma de MéxicoMorelia, Mexico
| | - Peter Hietz
- Institute of Botany, University of Natural Resources and Life SciencesVienna, Austria
| | - Wolfgang Wanek
- Department of Microbiology and Ecosystem Science, Division of Terrestrial Ecosystem Research, University of ViennaVienna, Austria
| | - Manuel Gloor
- Earth and Global Change, School of Geography, University of LeedsLeeds, UK
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Brienen RJW, Helle G, Pons TL, Guyot JL, Gloor M. Oxygen isotopes in tree rings are a good proxy for Amazon precipitation and El Nino-Southern Oscillation variability. Proc Natl Acad Sci U S A 2012; 109:16957-62. [PMID: 23027960 PMCID: PMC3479466 DOI: 10.1073/pnas.1205977109] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We present a unique proxy for the reconstruction of variation in precipitation over the Amazon: oxygen isotope ratios in annual rings in tropical cedar (Cedrela odorata). A century-long record from northern Bolivia shows that tree rings preserve the signal of oxygen isotopes in precipitation during the wet season, with weaker influences of temperature and vapor pressure. Tree ring δ(18)O correlates strongly with δ(18)O in precipitation from distant stations in the center and west of the basin, and with Andean ice core δ(18)O showing that the signal is coherent over large areas. The signal correlates most strongly with basin-wide precipitation and Amazon river discharge. We attribute the strength of this (negative) correlation mainly to the cumulative rainout processes of oxygen isotopes (Rayleigh distillation) in air parcels during westward transport across the basin. We further find a clear signature of the El Niño-Southern Oscillation (ENSO) in the record, with strong ENSO influences over recent decades, but weaker influence from 1925 to 1975 indicating decadal scale variation in the controls on the hydrological cycle. The record exhibits a significant increase in δ(18)O over the 20th century consistent with increases in Andean δ(18)O ice core and lake records, which we tentatively attribute to increased water vapor transport into the basin. Taking these data together, our record reveals a fresh path to diagnose and improve our understanding of variation and trends of the hydrological cycle of the world's largest river catchment.
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Affiliation(s)
- Roel J W Brienen
- Department of Ecology and Global Change, School of Geography, University of Leeds, Leeds LS2 9JT, United Kingdom.
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Houweling S, Badawy B, Baker DF, Basu S, Belikov D, Bergamaschi P, Bousquet P, Broquet G, Butler T, Canadell JG, Chen J, Chevallier F, Ciais P, Collatz GJ, Denning S, Engelen R, Enting IG, Fischer ML, Fraser A, Gerbig C, Gloor M, Jacobson AR, Jones DBA, Heimann M, Khalil A, Kaminski T, Kasibhatla PS, Krakauer NY, Krol M, Maki T, Maksyutov S, Manning A, Meesters A, Miller JB, Palmer PI, Patra P, Peters W, Peylin P, Poussi Z, Prather MJ, Randerson JT, Röckmann T, Rödenbeck C, Sarmiento JL, Schimel DS, Scholze M, Schuh A, Suntharalingam P, Takahashi T, Turnbull J, Yurganov L, Vermeulen A. Iconic CO
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Time Series at Risk. Science 2012; 337:1038-40. [DOI: 10.1126/science.337.6098.1038-b] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Affiliation(s)
- Sander Houweling
- SRON Netherlands Institute for Space Research, 3584 CA, Utrecht, Netherlands
- Institute for Marine and Atmospheric Research Utrecht, 3584 CC Utrecht, Netherlands
| | - Bakr Badawy
- Max-Planck-Institute for Biogeochemistry, 07745, Jena, Germany
| | - David F. Baker
- Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80523–1375, USA
| | - Sourish Basu
- SRON Netherlands Institute for Space Research, 3584 CA, Utrecht, Netherlands
- Institute for Marine and Atmospheric Research Utrecht, 3584 CC Utrecht, Netherlands
| | - Dmitry Belikov
- National Institute for Environmental Studies, Tsukuba, 305-8506, Japan
| | | | - Philippe Bousquet
- Laboratoire des Sciences du Climat et de l'Environnement, Unité mixte CEA, UVSQ, CNRS, 91191, Gif-sur-Yvette, France
| | - Gregoire Broquet
- Laboratoire des Sciences du Climat et de l'Environnement, Unité mixte CEA, UVSQ, CNRS, 91191, Gif-sur-Yvette, France
| | - Tim Butler
- Institute for Advanced Sustainability Studies, 14467, Potsdam, Germany
| | - Josep G. Canadell
- Global Carbon Project, Commonwealth Scientific and Industrial Research Organisation (CSIRO), Canberra, ACT 2601, Australia
| | - Jing Chen
- University of Toronto, Toronto, ON, M5S 1A7, Canada
| | - Frederic Chevallier
- Laboratoire des Sciences du Climat et de l'Environnement, Unité mixte CEA, UVSQ, CNRS, 91191, Gif-sur-Yvette, France
| | - Philippe Ciais
- Laboratoire des Sciences du Climat et de l'Environnement, Unité mixte CEA, UVSQ, CNRS, 91191, Gif-sur-Yvette, France
| | | | - Scott Denning
- Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80523–1375, USA
| | - Richard Engelen
- European Centre for Medium-Range Weather Forecasts, Shinfield Park, Reading, RG2 9AX, UK
| | - Ian G. Enting
- ARC Centre of Excellence in the Mathematics and Statistics of Complex Systems, University of Melbourne, Victoria 3010, Australia
| | - Marc L. Fischer
- Lawrence Berkeley National Laboratory, Washington, DC 20024, USA
| | | | | | - Manuel Gloor
- Earth and Biosphere Institute, School of Geography, University of Leeds, Leeds LS2 9JT, UK
| | - Andrew R. Jacobson
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA
- NOAA Earth System Research Laboratory, Boulder, CO 80305, USA
| | | | - Martin Heimann
- Max-Planck-Institute for Biogeochemistry, 07745, Jena, Germany
| | - Aslam Khalil
- Portland State University, Portland, OR 97207, USA
| | | | | | - Nir Y. Krakauer
- Department of Civil Engineering, City College of New York, New York, NY 10031, USA
| | - Maarten Krol
- SRON Netherlands Institute for Space Research, 3584 CA, Utrecht, Netherlands
- Institute for Marine and Atmospheric Research Utrecht, 3584 CC Utrecht, Netherlands
- Meteorology and Air Quality, Wageningen University and Research Center, 6708 PB Wageningen, Netherlands
| | - Takashi Maki
- Environmental and Applied Meteorology Research Department, Meteorol ogical Research Institute, Tskuba, Japan
| | - Shamil Maksyutov
- National Institute for Environmental Studies, Tsukuba, 305-8506, Japan
| | - Andrew Manning
- University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK
| | | | - John B. Miller
- Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA
- NOAA Earth System Research Laboratory, Boulder, CO 80305, USA
| | | | - Prabir Patra
- Research Institute for Global Change, Japan Agency for Marine-Earth Science and Technology, Yokohama, 236-0001, Japan
| | - Wouter Peters
- Meteorology and Air Quality, Wageningen University and Research Center, 6708 PB Wageningen, Netherlands
| | - Philippe Peylin
- Laboratoire des Sciences du Climat et de l'Environnement, Unité mixte CEA, UVSQ, CNRS, 91191, Gif-sur-Yvette, France
| | | | | | | | - Thomas Röckmann
- Institute for Marine and Atmospheric Research Utrecht, 3584 CC Utrecht, Netherlands
| | | | | | | | | | - Andrew Schuh
- Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO 80523–1375, USA
| | | | - Taro Takahashi
- Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964–8000, USA
| | | | - Leonid Yurganov
- University of Maryland Baltimore County, Baltimore, MD 21250, USA
| | - Alex Vermeulen
- Energieonderzoek Centrum Nederland, 1755 ZG Petten, Netherlands
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Gloor M, Scheffler K, Bieri O. Intrascanner and interscanner variability of magnetization transfer-sensitized balanced steady-state free precession imaging. Magn Reson Med 2010; 65:1112-7. [DOI: 10.1002/mrm.22694] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2010] [Revised: 07/26/2010] [Accepted: 09/24/2010] [Indexed: 11/11/2022]
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Garcia M, Gloor M, Wetzel S, Radue EW, Scheffler K, Bieri O. Characterization of normal appearing brain structures using high-resolution quantitative magnetization transfer steady-state free precession imaging. Neuroimage 2010; 52:532-7. [DOI: 10.1016/j.neuroimage.2010.04.242] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2010] [Revised: 04/14/2010] [Accepted: 04/19/2010] [Indexed: 11/28/2022] Open
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Gloor M, Oschmann H, Schmidt E, Friederich H. Beitrag zur quantitativen Bestimmung der Hautoberflächenlipide in der Praxis. Dermatology 2009. [DOI: 10.1159/000252030] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Gloor M, Schulz U, Wieland G, Wiegand I, Friederich H. Beitrag zur quantitativen Bestimmung der Hautoberflächenlipide in der Praxis. Dermatology 2009. [DOI: 10.1159/000252132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
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Gehse M, Küster S, Gloor M. Über die effektive Hornschichthemmtiefe von Ciclopiroxolamin und Naftifin in Abhängigkeit von der galenischen Zubereitung. On the Effective Dimension of Inhibition of Ciclopiroxolamine and Naftifine in the Horny Layer with Regard to the Galenic Preparatio. Mycoses 2009. [DOI: 10.1111/j.1439-0507.1987.tb04397.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Gehse M, Blesch A, Gloor M, Braun KJ. Intestinaler Hefepilzbefall: Ergebnisse einer 10tägigen Therapie mit Nystatin. Intestinal Yeast Colonization: Results of a Treatment with Nystatin over a Period of 10 Days. Mycoses 2009. [DOI: 10.1111/j.1439-0507.1987.tb04384.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Crevoisier C, Shevliakova E, Gloor M, Wirth C, Pacala S. Drivers of fire in the boreal forests: Data constrained design of a prognostic model of burned area for use in dynamic global vegetation models. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd008372] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Abstract
It is well known that, in Switzerland, communal grazing of livestock on alpine pastures plays an important role in the spread of BVD virus. Analogously, we might expect that the communal raising on farms specialising in raising heifers of animals born on different farms would also favour the spread of BVDV. This study investigated whether a persistently infected (PI) breeding heifer kept on this type of farm over a period of 26 months would put the other animals at risk of being infected. The PI-animal was in contact with 75 heifers (here defined as contact animals) on this farm. Thirty-two of the contact animals that were probably pregnant (animals at risk of giving birth to a PI-calf) were moved to 8 different breeding farms (here defined as farms at risk). On these 8 farms, 246 calves were found to be at risk of being infected with BVDV. We examined 78 calves and investigated whether the move of the pregnant animals from their original farm had permitted the virus to spread to these 8 other farms. The contact animals had a seroprevalence of 92% and the animals at risk a seroprevalence of 100%. Only one PI-animal was found on the farms at risk. This BVD infection, however, occurred independently of the PI-breeding animal. Seropositive calves were found only on 2 farms. This study did not provide any proof for a spread of BVDV with the PI-breeding animal as a source; likewise, no persistent infection was proven to exist on the farms at risk. This result is likely to be representative for the endemic situation of BVD in Switzerland. Thus, PI-animals present on heifer raising farms infect calves well before servicing. Hence, no new PI-animals are generated, and the infection becomes self-limiting. When we reconstructed the animal movements between the farms and determined the animals to be examined with the aid of the Swiss national animal traffic database (TVD) we found the data of 37% of the heifers to be incomplete and failed to successfully establish the whereabouts of 3 animals.
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Affiliation(s)
- M Gloor
- Wiederkäuerklinik, Universität Bern
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Gloor M, Dlugokencky E, Brenninkmeijer C, Horowitz L, Hurst DF, Dutton G, Crevoisier C, Machida T, Tans P. Three-dimensional SF6data and tropospheric transport simulations: Signals, modeling accuracy, and implications for inverse modeling. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2006jd007973] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Peylin P, Bréon FM, Serrar S, Tiwari Y, Chédin A, Gloor M, Machida T, Brenninkmeijer C, Zahn A, Ciais P. Evaluation of Television Infrared Observation Satellite (TIROS-N) Operational Vertical Sounder (TOVS) spaceborne CO2estimates using model simulations and aircraft data. ACTA ACUST UNITED AC 2007. [DOI: 10.1029/2005jd007018] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Gloor M, Klumpp G. Welche Akzeptorphase ist am ehesten repräsentativ für die Hornschicht bei in vitro‐Messungen der Wirkstoffabgabe aus Externa? ACTA ACUST UNITED AC 2006. [DOI: 10.1002/lipi.19810830308] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- M. Gloor
- Universitäts‐Hautklinik, Heidelberg
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Affiliation(s)
- M. Gloor
- Dermatologischen Klinik und Poliklinik der Philipps‐Universität Marburg a. d. Lahn
| | - W. J. Döring
- Dermatologischen Klinik und Poliklinik der Philipps‐Universität Marburg a. d. Lahn
| | - D. Kümpel
- Dermatologischen Klinik und Poliklinik der Philipps‐Universität Marburg a. d. Lahn
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Karstens U, Gloor M, Heimann M, Rödenbeck C. Insights from simulations with high-resolution transport and process models on sampling of the atmosphere for constraining midlatitude land carbon sinks. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd006278] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Tiwari YK, Gloor M, Engelen RJ, Chevallier F, Rödenbeck C, Körner S, Peylin P, Braswell BH, Heimann M. Comparing CO2retrieved from Atmospheric Infrared Sounder with model predictions: Implications for constraining surface fluxes and lower-to-upper troposphere transport. ACTA ACUST UNITED AC 2006. [DOI: 10.1029/2005jd006681] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
Emulsifying agents in aqueous solution lead to dehydration of the horny layer of the epidermis and damage to the barrier. This is only partly true if emulsifying agents are constituents of emulsions. Water-in-oil (W/O) emulsions cause an improvement in the hydration of the horny layer and barrier function. In the case of an additional effect of wash solutions, a partial or complete abolition of the drying out and barrier-damaging effect of the wash solution results. Oil-in-water (O/W) emulsions without glycerol have no effect on the moisture of the horny layer or indeed increase it, but they lead to considerable damage to the barrier and irritation. In wash tests, they do not induce any protective effect. With micro-emulsions this is still more the case and, moreover, they can also lead to exsiccation. As a result of the addition of glycerol, the barrier-damaging effect can be abolished. Also in stress tests with wash solutions, the damage to the horny layer is reduced by glycerol-containing O/W emulsions. Whereas the penetration-promoting effect of O/W emulsions without glycerol is best, only W/O emulsions or glycerol-containing O/W emulsions are suitable for atopic dermatitis. A hydrating effect on the stratum corneum was also found in a propylene glycol ointment.
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Affiliation(s)
- M Gloor
- Dermatological Department, City Hospital of Karlsruhe, Karlsruhe, Germany.
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Gloor M, Hauth A, Gehring W. O/W emulsions compromise the stratum corneum barrier and improve drug penetration. Pharmazie 2003; 58:709-15. [PMID: 14609282] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
BACKGROUND W/O emulsions improve the stratum corneum barrier, while microemulsions tend to compromise it. We, therefore, were interested to explore the effects of O/W emulsions on the stratum corneum barrier. METHODS Aqueous Cream BP 2001, Clioquinol Cream BP 1999 without clioquinol, Nonionic Hydrophilic Cream DAB 2001 without glycerol, Hydrophilic Skin Emulsion Base NRF S. 25., point of time 2001, without glycerol, and Base Cream DAC were tested versus untreated controls in 29 healthy volunteers for 7 days. Outcome measures included transepidermal water loss (TEWL), skin redness (chromametry a*-value) and erythrocyte circulation in the subpapillary vessels (laser Doppler). Barrier compromise was subsequently explored by performing the hydrocortisone blanching test using Hydrocortisone Cream 0.5% NRF 11.36. (outcome measure: a*-value) in 15 subjects and the sodium lauryl sulfate (SLS) irritation test (outcome measures: TEWL, a*-value, laser Doppler) in 14 subjects. RESULTS Pretreatment with the test emulsions produced increases in TEWL (statistically significant for all test emulsions), a*-value (statistically significant for Aqueous Cream BP 2001 and Base Cream DAC), and laser Doppler value (statistically significant for all emulsions except Base Cream DAC). Hydrocortisone penetration was statistically significantly increased with all test emulsions versus untreated contols. SLS irritation was mostly statistically significantly increased versus untreated controls when analyzing the study endpoint-baseline difference. CONCLUSIONS O/W emulsions may compromise the stratum corneum barrier and improve drug penetration.
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Affiliation(s)
- M Gloor
- Department of Dermatology, Klinikum der Stadt Karlsruhe GmbH, Germany.
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Abstract
Antibiotic therapy directed against Propionibacterium acnes has been a mainstay of treatment for more than 40 years. Despite years of widespread use of systemic tetracyclines and erythromycin, change in P. acnes sensitivity to antibiotics was not seen until the early 1980s. The first clinically relevant changes in P. acnes antibiotic sensitivity were found in the USA shortly after the introduction of topical formulations of erythromycin and clindamycin. By the late 1980s, P. acnes strains with very high MIC levels for erythromycin and elevated MICs for tetracycline were increasingly found in the UK and the USA. Mutations in the genes encoding the 23S and 16S subunits of ribosomal RNA were first identified in the UK and also seen in a recent survey from clinics in Europe, Japan, Australia and the USA. In addition, strains were found in which these known mutations could not be identified, indicating that as yet unidentified resistance mechanisms have evolved. These findings indicate the need to develop strategies to minimize the use of antibiotics in acne therapy.
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Abstract
BACKGROUND AND OBJECTIVE Erythromycin-sensitive and/or clindamycin-sensitive strains of Propionibacterium acnes show a reduced lipase production at levels below the minimal growth-inhibitory concentration (MIC). The objective of this study was to determine whether erythromycin and clindamycin concentrations far below the MIC inhibit lipase production in P. acnes strains resistant to these antibiotics. METHODS Of 42 P. acnes strains, 10 showed an MIC >256 micro g/ml for erythromycin. Two strains showed MICs of 0.19 and 0.25 micro g/ml, while the MIC of the remaining strains was <or=0.016 micro g/ml. Lipase activity was determined up to a concentration of 192 micro g/ml by cultivation on spirit blue agar + lipase reagent. The 10 strains whose erythromycin MIC was >256 micro g/ml were also tested for lipase inhibition by clindamycin. While this method fails to differentiate between inhibition of lipase production and inhibition of lipase activity, the absence of inhibition of lipase activity rules out inhibition of lipase production. RESULTS Inhibition of lipolysis by sub-MIC concentrations was demonstrated only for clindamycin in 3 P. acnes strains. However, lipase inhibition was seen only at the dilution level immediately below the MIC. CONCLUSIONS Resistant P. acnes strains with high erythromycin and/or clindamycin MICs can be ruled out to show in vitro inhibition of lipase production at antibiotic concentrations far below the MIC.
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Affiliation(s)
- M Gloor
- Department of Dermatology, Klinikum der Stadt Karlsruhe, Germany.
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Abstract
OBJECTIVE To compare the keratolytic activities of a drug-free hydrophilic microemulsion (ME) and a drug-free lipophilic ME with water, and with regard to the hydrophilic ME also with a 5% salicylic acid gel on the sole of the foot. METHODS Twenty healthy volunteers had their plantar forefoot, midfoot, and rearfoot stratum corneum blackened with silver nitrate and a photographic developer, and a chromameter was used to determine the extent of removal of this black dye by a* value and L value measurement at 24 and 48 h. RESULTS Both drug-free MEs produced significantly greater increases in a* value and L value than water, and the hydrophilic ME was also more effective than 5% salicylic acid gel. CONCLUSION The irritating effect of MEs is rather negligible on the sole of the foot because of the thick plantar stratum corneum. Both MEs therefore appear suitable for the elimination or prevention of plantar desquamative and hyperkeratotic skin changes.
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Affiliation(s)
- M Gloor
- Department of Dermatology, Karlsruhe Municipal Medical Center, Karlsruhe, Germany.
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Abstract
The appearance of the skin depends greatly on the hydration of the stratum corneum which is regulated by water binding substances of the corneocytes and also by the quality of the stratum corneum lipids. Furthermore these lipids are responsible for the barrier function. In patients with atopic dermatitis, the water binding capacity and the barrier function of the stratum corneum are reduced even in clinically healthy skin areas. Emollients can damage the stratum corneum and lead to desiccation and a disturbance of the barrier. This effect is a result of an increased permeability of the barrier lipids and direct damage to the keratinocytes and corneocytes. The degree of damage of the barrier caused by emollients in dermatological vehicles has not been sufficiently investigated. As suggested by hypothetical considerations, such an effect is not expected and cannot be demonstrated in water-in-oil-emulsions. Oil-in-water-emulsions without glycerol as well as lipophilic and hydrophilic microemulsions do damage the barrier function. Both types of microemulsions additionally lead to a dehydration of the stratum corneum. The damaging effect of oil-in-water-emulsions can be reduced by the addition of glycerol and urea.
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Affiliation(s)
- M Gloor
- Hautklinik am Klinikum der Stadt Karlsruhe gGmbH.
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Gloor M, Becker A, Wasik B, Kniehl E. [Triclosan, a topical dermatologic agent. In vitro- and in vivo studies on the effectiveness of a new preparation in the New German Formulary]. Hautarzt 2002; 53:724-9. [PMID: 12402134 DOI: 10.1007/s00105-002-0416-y] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVE Triclosan (2,4,4'-trichloro-2'-hydroxydiphenyl ether) is an antiseptic suitable for formulation as a W/O emulsion. The objective of the present study was to explore its potential utility in atopic dermatitis and prophylactic skin care following leg eczema and leg ulcer treatment. SUBJECTS AND METHODS We performed in vitro susceptibility testing using the agar diffusion test on 602 isolates from swabs of our institution's Division of Dermatology. Additionally in an in vivo study with 15 healthy volunteers, the occlusion test and the expanded flora test were performed following the application of Hydrophobic Triclosan Cream 2% NRF (New German Formulary) 11.122. (TC) versus untreated, triclosan-free vehicle, 1% chlorhexidine digluconate solution, and ethanol 70%. RESULTS In vitro susceptibility testing showed excellent activity against Staphylococcus aureus, Klebsiella species, and Proteus species. TC had little or no effect on Pseudomonas, beta-hemolytic streptococci, enterococci, and Candida species. In the in vivo study, TC produced a highly significant, quantitatively substantial reduction in aerobic bacterial counts versus untreated and versus vehicle. The 1% chlorhexidine digluconate solution was significantly more effective than TC in the expanded flora test. CONCLUSIONS As S. aureus is a relevant pathogen in atopic dermatitis, and gram-negative organisms, including Klebsiella and Proteus species, as well as S. aureus play a major role in the prophylactic skin care after leg eczema and leg ulcer treatment, TC appears to be suitable for maintenance therapy in these indications.
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Affiliation(s)
- M Gloor
- Hautklinik am Klinikum der Stadt Karlsruhe, Germany.
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Gloor M, Senger B, Gehring W. Wirkt eine Kombination von Dexpanthenol und Glycerin stärker hydratisierend als die Einzelkomponenten allein? Akt Dermatol 2002. [DOI: 10.1055/s-2002-36132] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Gloor M, Reichling J, Wasik B, Holzgang HE. Antiseptic effect of a topical dermatological formulation that contains Hamamelis distillate and urea. Complement Med Res 2002; 9:153-9. [PMID: 12119511 DOI: 10.1159/000064265] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
OBJECTIVE To determine the antimicrobial activity of a distillate of Hamamelis (Aqua Hamamelidis ), United States Pharmacopoeia (USP) 23, and urea formulated as a topical dermatological preparation that contains both active ingredients. METHODS Using the simple occlusion test and expanded flora test, we conducted in vivo studies in 15 healthy volunteers. We also performed in vitro studies using the agar diffusion test. RESULTS The occlusion test and expanded flora test demonstrated significant antimicrobial activity for a product containing the Hamamelis distillate (90%) and urea (5%) among other ingredients. The expanded flora test demonstrated significant antimicrobial activity for both Hamamelis distillate and urea. The simple occlusion test showed the same tendency, but results were not significant. The agar diffusion test showed inhibition of Staphylococcus aureus and Candida albicans, among other organisms. Comparison with earlier studies of chlorhexidine digluconate and fuchsine using the same method showed that the antimicrobial activities of Hamamelis distillate and urea were relatively weak. This finding is supported by the weak inhibitory activity observed in the agar diffusion test (using 100% of the finished dosage form). CONCLUSION Formulations of Hamamelis distillate and urea are mainly used for their antiinflammatory, hydrating, and barrier-stabilizing effects in dermatitis maintenance therapy. As bacterial colonization has a central role in the pathogenesis of atopic dermatitis and intertrigo, the antimicrobial activity of such products is considered a welcome, added benefit.
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Affiliation(s)
- M Gloor
- Hautklinik, Städtisches Klinikum Karlsruhe, Germany.
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