1
|
Frenger I, Landolfi A, Kvale K, Somes CJ, Oschlies A, Yao W, Koeve W. Misconceptions of the marine biological carbon pump in a changing climate: Thinking outside the "export" box. Glob Chang Biol 2024; 30:e17124. [PMID: 38273488 DOI: 10.1111/gcb.17124] [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] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Revised: 11/10/2023] [Accepted: 11/20/2023] [Indexed: 01/27/2024]
Abstract
The marine biological carbon pump (BCP) stores carbon in the ocean interior, isolating it from exchange with the atmosphere and thereby coregulating atmospheric carbon dioxide (CO2 ). As the BCP commonly is equated with the flux of organic material to the ocean interior, termed "export flux," a change in export flux is perceived to directly impact atmospheric CO2 , and thus climate. Here, we recap how this perception contrasts with current understanding of the BCP, emphasizing the lack of a direct relationship between global export flux and atmospheric CO2 . We argue for the use of the storage of carbon of biological origin in the ocean interior as a diagnostic that directly relates to atmospheric CO2 , as a way forward to quantify the changes in the BCP in a changing climate. The diagnostic is conveniently applicable to both climate model data and increasingly available observational data. It can explain a seemingly paradoxical response under anthropogenic climate change: Despite a decrease in export flux, the BCP intensifies due to a longer reemergence time of biogenically stored carbon back to the ocean surface and thereby provides a negative feedback to increasing atmospheric CO2 . This feedback is notably small compared with anthropogenic CO2 emissions and other carbon-climate feedbacks. In this Opinion paper, we advocate for a comprehensive view of the BCP's impact on atmospheric CO2 , providing a prerequisite for assessing the effectiveness of marine CO2 removal approaches that target marine biology.
Collapse
Affiliation(s)
- Ivy Frenger
- Biogeochemical Modelling, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | | | - Karin Kvale
- Biogeochemical Modelling, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
- GNS Science, Te Pū Ao, Lower Hutt, New Zealand
| | - Christopher J Somes
- Biogeochemical Modelling, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - Andreas Oschlies
- Biogeochemical Modelling, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - Wanxuan Yao
- Biogeochemical Modelling, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| | - Wolfgang Koeve
- Biogeochemical Modelling, GEOMAR Helmholtz Centre for Ocean Research Kiel, Kiel, Germany
| |
Collapse
|
2
|
Aranciaga N, Ross AB, Morton JD, McDonald R, Gathercole JL, Berg DK. Metabolomic evolution of the postpartum dairy cow uterus. Mol Reprod Dev 2023; 90:835-848. [PMID: 37632839 DOI: 10.1002/mrd.23702] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Revised: 07/24/2023] [Accepted: 07/30/2023] [Indexed: 08/28/2023]
Abstract
High rates of early pregnancy loss are a critical issue in dairy herds, particularly in seasonal, grazing systems. Components of the uterine luminal fluid (ULF), on which the early embryo depends for sustenance and growth, partly determine early pregnancy losses. Here, changes in ULF from early to mid-postpartum in crossbred dairy cows were explored, linking them with divergent embryo development. For this, the uteri of 87 cows at Day 7 of pregnancy at first and third estrus postpartum were flushed to collect ULF. Eighteen metabolites (chiefly organic acids and sugars) significantly varied in abundance across postpartum, indicating a molecular signature of physiological recovery consistent of the upregulation of pyrimidine metabolism and glycerophospholipid metabolism, and downregulation of pentose phosphate and taurine metabolism pathways. Joint pathway analysis of metabolomics data and a previously generated proteomics data set on the same ULF samples suggests key links between postpartum recovery and subsequent successful embryo development. These include upregulation of VEGFA and downregulation of metabolism, NRF2, T-cell receptor, which appear to improve the ULF's capacity of sustaining normal embryo development, and a putative osmo-protectant role of beta-alanine. These relationships should be further investigated to develop tools to detect and reduce early pregnancy loss in dairy cows.
Collapse
Affiliation(s)
- Nicolas Aranciaga
- Proteins and Metabolites Team, AgResearch, Christchurch, New Zealand
- Faculty of Agriculture and Life Sciences, Lincoln University, Christchurch, New Zealand
- Animal Biotechnology Team, AgResearch, Hamilton, New Zealand
| | - Alastair B Ross
- Proteins and Metabolites Team, AgResearch, Christchurch, New Zealand
| | - James D Morton
- Faculty of Agriculture and Life Sciences, Lincoln University, Christchurch, New Zealand
| | - Robin McDonald
- Animal Biotechnology Team, AgResearch, Hamilton, New Zealand
| | | | - Debra K Berg
- Animal Biotechnology Team, AgResearch, Hamilton, New Zealand
| |
Collapse
|
3
|
Fraser B, Chisholm E, Pierse N. "You're so powerless": Takatāpui/LGBTIQ+ people's experiences before becoming homeless in Aotearoa New Zealand. PLoS One 2021; 16:e0259799. [PMID: 34928948 PMCID: PMC8687556 DOI: 10.1371/journal.pone.0259799] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Accepted: 10/27/2021] [Indexed: 11/18/2022] Open
Abstract
Little is known in Aotearoa New Zealand about experiences of homelessness amongst Takatāpui/LGBTIQ+ identifying people, despite growing international literature regarding LGBTIQ+ homelessness. Using data from semi-structured interviews with eight people who identified as Takatāpui/LGBTIQ+ and had experienced homelessness, this paper explores their experiences prior to becoming homeless. These experiences are placed into the categories of: the pervasiveness of instability (especially in regards to family relationships, finances, and housing), having to grow up fast due to social and material conditions, experiences of looking for housing in stressed markets, and systems failures that resulted in a lack of autonomy. These results show that instability and systems failures are key contributors to Takatāpui/LGBTIQ+ people becoming homeless in Aotearoa New Zealand.
Collapse
Affiliation(s)
- Brodie Fraser
- He Kāinga Oranga, Department of Public Health, University of Otago, Wellington, Aoteaora New Zealand
- * E-mail:
| | - Elinor Chisholm
- He Kāinga Oranga, Department of Public Health, University of Otago, Wellington, Aoteaora New Zealand
| | - Nevil Pierse
- He Kāinga Oranga, Department of Public Health, University of Otago, Wellington, Aoteaora New Zealand
| |
Collapse
|
4
|
Bedoya CL, Brockerhoff EG, Hayes M, Leskey TC, Morrison WR, Rice KB, Nelson XJ. Brown marmorated stink bug overwintering aggregations are not regulated through vibrational signals during autumn dispersal. R Soc Open Sci 2020; 7:201371. [PMID: 33391809 PMCID: PMC7735358 DOI: 10.1098/rsos.201371] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Accepted: 10/30/2020] [Indexed: 06/12/2023]
Abstract
The brown marmorated stink bug, Halyomorpha halys (Heteroptera: Pentatomidae), is regarded as one of the world's most pernicious invasive pest species, as it feeds on a wide range of economically important crops. During the autumn dispersal period, H. halys ultimately moves to potential overwintering sites, such as human-made structures or trees where it will alight and seek out a final overwintering location, often aggregating with other adults. The cues used during this process are unknown, but may involve vibrational signals. We evaluated whether vibrational signals regulate cluster aggregation in H. halys in overwintering site selection. We collected acoustic data for six weeks during the autumn dispersal period and used it to quantify movement and detect vibrational communication of individuals colonizing overwintering shelters. Both movement and vibrational signal production increased after the second week, reaching their maxima in week four, before decaying again. We found that only males produced vibrations in this context, yet there was no correlation between movement and vibrational signals, which was confirmed through playback experiments. The cues regulating the formation of aggregations remain largely unknown, but vibrations may indicate group size.
Collapse
Affiliation(s)
- Carol L. Bedoya
- School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
| | - Eckehard G. Brockerhoff
- School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
- Scion (New Zealand Forest Research Institute), Christchurch, New Zealand
- Swiss Federal Research Institute WSL, Birmensdorf, Switzerland
| | - Michael Hayes
- Department of Electrical and Computer Engineering, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
| | - Tracy C. Leskey
- USDA, Agricultural Research Service, Appalachian Fruit Research Station, Kearneysville, WV, USA
| | - William R. Morrison
- USDA-ARS, Center for Animal Health and Grain Research, 1515 College Ave, Manhattan, KS 66502, USA
| | - Kevin B. Rice
- Division of Plant Sciences, University of Missouri, 1-33 Agriculture Building, Columbia MO 65211, USA
| | - Ximena J. Nelson
- School of Biological Sciences, University of Canterbury, Private Bag 4800, Christchurch, New Zealand
| |
Collapse
|
5
|
Burrow K, Young W, Hammer N, Safavi S, Scholze M, McConnell M, Carne A, Barr D, Reid M, Bekhit AED. The Effect of the Supplementation of a Diet Low in Calcium and Phosphorus with Either Sheep Milk or Cow Milk on the Physical and Mechanical Characteristics of Bone using A Rat Model. Foods 2020; 9:E1070. [PMID: 32784633 PMCID: PMC7466322 DOI: 10.3390/foods9081070] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2020] [Revised: 08/04/2020] [Accepted: 08/05/2020] [Indexed: 11/16/2022] Open
Abstract
This study assessed the effect of cow milk (CM) and sheep milk (SM) consumption on the micro-structure, mechanical function, and mineral composition of rat femora in a male weanling rat model. Male weanling rats were fed a basal diet with a 50% reduction in calcium and phosphorus content (low Ca/P-diet) supplemented with either SM or CM. Rats were fed for 28 days, after which the femora were harvested and stored. The femora were analyzed by μ-CT, three-point bending, and inductively coupled plasma-mass spectrometry (ICP-MS). The addition of either milk to the low Ca/P-diet significantly increased (p < 0.05) trabecular bone volume, trabecular bone surface density, trabecular number, cortical bone volume, and maximum force, when compared to rats that consumed only the low Ca/P-diet. The consumption of either milk resulted in a significant decrease (p < 0.05) in trabecular pattern factor, and cortical bone surface to volume ratio when compared to rats that consumed only the low Ca/P-diet. The results were achieved with a lower consumption of SM compared to that of CM (p < 0.05). This work indicates that SM and CM can help overcome the effects on bone of a restriction in calcium and phosphorus intake.
Collapse
Affiliation(s)
- Keegan Burrow
- Department of Wine, Food and Molecular Biosciences, Lincoln University, PO Box 85084, Lincoln 7647, New Zealand
| | - Wayne Young
- AgResearch Ltd, Grasslands Research Centre, Private Bag 11008, Manawatu Mail Centre, Palmerston North 4442, New Zealand;
- Riddet Institute, Massey University, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
| | - Niels Hammer
- Department of Macroscopic and Clinical Anatomy, Medical University of Graz, 8010 Graz, Austria;
- Department of Orthopaedic and Trauma Surgery, University of Leipzig, Liebigstraße 20, 04103 Leipzig, Germany
- Fraunhofer IWU, Nöthnitzer Straße 44, 01187 Dresden, Germany
| | - Sarah Safavi
- Department of Anatomy, University of Otago, PO Box 56, Dunedin 9054, New Zealand;
| | - Mario Scholze
- Institute of Materials Science and Engineering, Chemnitz University of Technology, Straße der Nationen, 62, 09111 Chemnitz, Germany;
| | - Michelle McConnell
- Department of Microbiology and Immunology, University of Otago, PO Box 56, Dunedin 9054, New Zealand;
| | - Alan Carne
- Department of Biochemistry, University of Otago, PO Box 56, Dunedin 9054, New Zealand;
| | - David Barr
- Department of Chemistry, University of Otago, PO Box 56, Dunedin 9054, New Zealand; (D.B.); (M.R.)
| | - Malcolm Reid
- Department of Chemistry, University of Otago, PO Box 56, Dunedin 9054, New Zealand; (D.B.); (M.R.)
| | - Alaa El-Din Bekhit
- Department of Food Science, University of Otago, PO Box 56, Dunedin 9054, New Zealand
| |
Collapse
|
6
|
Burrow K, Young W, McConnell M, Carne A, Barr D, Reid M, Bekhit AED. The Effect of Sheep and Cow Milk Supplementation of a Low Calcium Diet on the Distribution of Macro and Trace Minerals in the Organs of Weanling Rats. Nutrients 2020; 12:E594. [PMID: 32106433 PMCID: PMC7146164 DOI: 10.3390/nu12030594] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2020] [Revised: 02/22/2020] [Accepted: 02/22/2020] [Indexed: 01/15/2023] Open
Abstract
The aim of this study was to investigate the effect of either sheep or cow milk supplementation to a low calcium and phosphorus diet on growth and organ mineral distribution in weanling rats. Rats were fed diets consisting of either a control chow, a 50% reduced calcium and phosphorous chow (low Ca/P), low Ca/P and sheep milk, or low Ca/P and cow milk diet for 28 days. Food intake of the rats, the growth rate of the rats, and the concentrations of minerals in the soft organs and serum were determined. Rats fed the low Ca/P diet alone had lower weight gain than rats consuming either of the milk-supplemented diets (p < 0.05). Both sheep milk and cow milk supplementation overcame the effects of consuming a diet restricted in calcium and phosphorus but the sheep milk was effective at a significantly lower level of milk intake (p < 0.05). Significant differences (p < 0.05) in essential and trace mineral concentrations due to milk type were observed in the kidney, spleen, and liver. For non-essential minerals, significant differences (p < 0.05), related to diet, were observed in all organs for arsenic, cesium, rubidium, and strontium concentrations.
Collapse
Affiliation(s)
- Keegan Burrow
- Department of Food Science, University of Otago PO Box 56, Dunedin 9054, New Zealand
- Department of Wine, Food and Molecular Biosciences, Lincoln University, PO Box 85084, Lincoln 7647, New Zealand
| | - Wayne Young
- AgResearch Ltd, Grasslands Research Centre, Private Bag 11008, Manawatu Mail Centre, Palmerston North 4442, New Zealand;
- Riddet Institute, Massey University, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand
| | - Michelle McConnell
- Department of Microbiology and Immunology, University of Otago PO Box 56, Dunedin 9054, New Zealand;
| | - Alan Carne
- Department of Biochemistry, University of Otago PO Box 56, Dunedin 9054, New Zealand;
| | - David Barr
- Department of Chemistry, University of Otago PO Box 56, Dunedin 9054, New Zealand; (D.B.); (M.R.)
| | - Malcolm Reid
- Department of Chemistry, University of Otago PO Box 56, Dunedin 9054, New Zealand; (D.B.); (M.R.)
| | - Alaa El-Din Bekhit
- Department of Food Science, University of Otago PO Box 56, Dunedin 9054, New Zealand
| |
Collapse
|
7
|
Donaldson LA, Cairns M, Hill SJ. Comparison of Micropore Distribution in Cell Walls of Softwood and Hardwood Xylem. Plant Physiol 2018; 178:1142-1153. [PMID: 30217826 PMCID: PMC6236611 DOI: 10.1104/pp.18.00883] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2018] [Accepted: 09/06/2018] [Indexed: 05/16/2023]
Abstract
The porosity of wood cell walls is of interest for both understanding xylem functionality and from a wood materials perspective. The movement of water in xylem generally occurs through the macroporous networks formed in softwood by bordered pits and in hardwood by the intervessel pits and open conduits created by vessels and perforation plates. In some situations, such as cavitated xylem, water can only move through the micropores that occur in lignified tracheid and fiber cell walls; however, these micropore networks are poorly understood. Here, we used molecular microscopy analysis of radiata pine (Pinus radiata) and red beech (Nothofagus fusca) to determine the distribution of micropores in the secondary walls and middle lamellae of tracheids and fibers in relation to cell wall composition. Using two different types of probe, we identified a greater porosity of secondary cell walls and a reduced porosity of the middle lamella. Areas of reduced porosity were observed in the outer regions of the secondary cell wall of both tracheids and fibers that appear unrelated to lignification or the distribution of cellulose, mannan, and xylan. Hardwood fiber cell walls were less lignified than those of softwood tracheids and showed greater accessibility to porosity probes. Vessel cell walls were comparable to those of fibers in terms of both porosity and lignification. Lignification is probably the primary determinant of cell wall porosity in xylem. The highly lignified middle lamella, and lumen surface, act as a barrier to probe movement and, therefore, water movement in both softwood and hardwood.
Collapse
Affiliation(s)
| | - Mathew Cairns
- Victoria University of Wellington, Wellington 6140, New Zealand
| | | |
Collapse
|