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Alonso Aller E, Eklöf JS, Gullström M, Kloiber U, Linderholm HW, Nordlund LM. Temporal variability of a protected multispecific tropical seagrass meadow in response to environmental change. Environ Monit Assess 2019; 191:774. [PMID: 31773384 PMCID: PMC6879446 DOI: 10.1007/s10661-019-7977-z] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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: 05/17/2019] [Accepted: 11/13/2019] [Indexed: 06/10/2023]
Abstract
In a changing environment, there is an increasing interest to monitor ecosystems to understand their responses to environmental change. Seagrass meadows are highly important ecosystems that are under constant pressure from human activities and climate impacts, with marked declines observed worldwide. Despite increasing efforts, monitoring of multispecific tropical seagrass meadows is scarce, particularly in low-income regions. Based on data from a monitoring programme in a marine protected area in Zanzibar (Tanzania), we assessed temporal changes in seagrass cover and species composition during a 10-year period in relation to local variability in environmental variables. We observed a strong, gradual decline in seagrass cover and changes in species composition, followed by a period of recovery. However, the timing and length of these temporal patterns varied in space (between transects). Multiple environmental variables-cloud cover, temperature, storm occurrence, sunspot activity, and tidal amplitude and height-influenced seagrass cover, although only to a minor extent, suggesting that the monitored seagrass meadow may be influenced by other unmeasured factors (e.g. water currents and sediment movement). Our results show that seagrass meadows can be highly dynamic at small (10-50 m) spatial scales, even in the absence of major local anthropogenic impacts. Our findings suggest that high-resolution monitoring programmes can be highly valuable for the detection of temporal changes in multispecific seagrass meadows; however, to understand the causes of change, there is a need of long-term (> 10 years) data series that include direct measurements of environmental variables and extreme events.
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Affiliation(s)
- E Alonso Aller
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - J S Eklöf
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
| | - M Gullström
- Department of Ecology, Environment and Plant Sciences, Stockholm University, Stockholm, Sweden
- Department of Biological and Environmental Sciences, University of Gothenburg, Kristineberg, Fiskebäckskil, Sweden
| | - U Kloiber
- Chumbe Island Coral Park (CHICOP), Zanzibar, Tanzania
| | - H W Linderholm
- Regional Climate Group, Department of Earth Sciences, Gothenburg University, Gothenburg, Sweden
| | - L M Nordlund
- Natural Resources and Sustainable Development, Department of Earth Sciences, Campus Gotland, Uppsala University, Uppsala, Sweden.
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Mazzuca S, Björk M, Beer S, Felisberto P, Gobert S, Procaccini G, Runcie J, Silva J, Borges AV, Brunet C, Buapet P, Champenois W, Costa MM, D’Esposito D, Gullström M, Lejeune P, Lepoint G, Olivé I, Rasmusson LM, Richir J, Ruocco M, Serra IA, Spadafora A, Santos R. Establishing research strategies, methodologies and technologies to link genomics and proteomics to seagrass productivity, community metabolism, and ecosystem carbon fluxes. Front Plant Sci 2013; 4:38. [PMID: 23515425 PMCID: PMC3601598 DOI: 10.3389/fpls.2013.00038] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 02/12/2013] [Indexed: 05/03/2023]
Abstract
A complete understanding of the mechanistic basis of marine ecosystem functioning is only possible through integrative and interdisciplinary research. This enables the prediction of change and possibly the mitigation of the consequences of anthropogenic impacts. One major aim of the European Cooperation in Science and Technology (COST) Action ES0609 "Seagrasses productivity. From genes to ecosystem management," is the calibration and synthesis of various methods and the development of innovative techniques and protocols for studying seagrass ecosystems. During 10 days, 20 researchers representing a range of disciplines (molecular biology, physiology, botany, ecology, oceanography, and underwater acoustics) gathered at The Station de Recherches Sous-marines et Océanographiques (STARESO, Corsica) to study together the nearby Posidonia oceanica meadow. STARESO is located in an oligotrophic area classified as "pristine site" where environmental disturbances caused by anthropogenic pressure are exceptionally low. The healthy P. oceanica meadow, which grows in front of the research station, colonizes the sea bottom from the surface to 37 m depth. During the study, genomic and proteomic approaches were integrated with ecophysiological and physical approaches with the aim of understanding changes in seagrass productivity and metabolism at different depths and along daily cycles. In this paper we report details on the approaches utilized and we forecast the potential of the data that will come from this synergistic approach not only for P. oceanica but for seagrasses in general.
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Affiliation(s)
- Silvia Mazzuca
- Department of Chemistry and Technology, University of CalabriaRende, Italy
- *Correspondence: Silvia Mazzuca, Department of Chemistry and Technologies building 12 C, Ponte Bucci University of Calabria, 87036 Rende, Italy. e-mail: ; Rui Santos, Marine Plant Ecology (ALGAE), Center of Marine Sciences, University of Algarve Gambelas, 8005-139 Faro, Portugal. e-mail:
| | - M. Björk
- Department of Ecology, Environment and Plant Sciences, Stockholm UniversityStockholm, Sweden
| | - S. Beer
- Department of Plant Sciences, Tel Aviv UniversityTel Aviv, Israel
| | | | - S. Gobert
- Département de Biologie, Ecologie et Evolution, MARE, Université de LiègeLiège, Belgium
| | | | - J. Runcie
- School of Biological Sciences, University of SydneySydney, NSW, Australia
| | - J. Silva
- Marine Plant Ecology (ALGAE), Center of Marine Sciences, University of AlgarveFaro, Portugal
| | - A. V. Borges
- Chemical Oceanography Unit, Université de LiègeLiège, Belgium
| | - C. Brunet
- Stazione Zoologica Anton DohrnNaples, Italy
| | - P. Buapet
- Department of Ecology, Environment and Plant Sciences, Stockholm UniversityStockholm, Sweden
| | - W. Champenois
- Chemical Oceanography Unit, Université de LiègeLiège, Belgium
| | - M. M. Costa
- Marine Plant Ecology (ALGAE), Center of Marine Sciences, University of AlgarveFaro, Portugal
| | | | - M. Gullström
- Department of Ecology, Environment and Plant Sciences, Stockholm UniversityStockholm, Sweden
| | - P. Lejeune
- STARESO SAS, Pointe RevellataCalvi, France
| | - G. Lepoint
- Département de Biologie, Ecologie et Evolution, MARE, Université de LiègeLiège, Belgium
| | - I. Olivé
- Marine Plant Ecology (ALGAE), Center of Marine Sciences, University of AlgarveFaro, Portugal
| | - L. M. Rasmusson
- Department of Ecology, Environment and Plant Sciences, Stockholm UniversityStockholm, Sweden
| | - J. Richir
- Département de Biologie, Ecologie et Evolution, MARE, Université de LiègeLiège, Belgium
| | - M. Ruocco
- Stazione Zoologica Anton DohrnNaples, Italy
| | - I. A. Serra
- Department of Chemistry and Technology, University of CalabriaRende, Italy
| | - A. Spadafora
- Department of Chemistry and Technology, University of CalabriaRende, Italy
| | - Rui Santos
- Marine Plant Ecology (ALGAE), Center of Marine Sciences, University of AlgarveFaro, Portugal
- *Correspondence: Silvia Mazzuca, Department of Chemistry and Technologies building 12 C, Ponte Bucci University of Calabria, 87036 Rende, Italy. e-mail: ; Rui Santos, Marine Plant Ecology (ALGAE), Center of Marine Sciences, University of Algarve Gambelas, 8005-139 Faro, Portugal. e-mail:
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Abstract
AIMS To assess the effect of metformin on insulin sensitivity, glucose tolerance and components of the metabolic syndrome in patients with impaired glucose tolerance (IGT). METHODS Forty first-degree relatives of patients with Type 2 diabetes fulfilling WHO criteria for IGT and participating in the Botnia study in Finland were randomized to treatment with either metformin 500 mg b.i.d. or placebo for 6 months. An oral glucose tolerance test (OGTT) and a euglycaemic hyperinsulinaemic clamp in combination with indirect calorimetry was performed at 0 and 6 months. The patients were followed after stopping treatment for another 6 months in an open trial and a repeat OGTT was performed at 12 months. RESULTS Metformin treatment resulted in a 20% improvement in insulin-stimulated glucose metabolism (from 28.7 +/- 13 to 34.4 +/- 10.7 micromol/kg fat-free mass (FFM)/min) compared with placebo (P = 0.01), which was primarily due to an increase in glucose oxidation (from 16.6 +/- 3.6 to 19.1 +/- 4.4 micromol/kg FFM; P = 0.03) These changes were associated with a minimal improvement in glucose tolerance, which was maintained after 12 months. CONCLUSIONS Metformin improves insulin sensitivity in subjects with IGT primarily by reversal of the glucose fatty acid cycle. Obviously large multicentre studies are needed to establish whether these effects are sufficient to prevent progression to manifest Type 2 diabetes and associated cardiovascular morbidity and mortality. Diabet. Med. 18, 578-583 (2001)
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Affiliation(s)
- M Lehtovirta
- Department of Medicine, Helsinki University Hospital, Helsinki, Finland
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Lehto M, Tuomi T, Mahtani MM, Widén E, Forsblom C, Sarelin L, Gullström M, Isomaa B, Lehtovirta M, Hyrkkö A, Kanninen T, Orho M, Manley S, Turner RC, Brettin T, Kirby A, Thomas J, Duyk G, Lander E, Taskinen MR, Groop L. Characterization of the MODY3 phenotype. Early-onset diabetes caused by an insulin secretion defect. J Clin Invest 1997; 99:582-91. [PMID: 9045858 PMCID: PMC507838 DOI: 10.1172/jci119199] [Citation(s) in RCA: 139] [Impact Index Per Article: 5.1] [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: 02/03/2023] Open
Abstract
Maturity-onset diabetes of the young (MODY) type 3 is a dominantly inherited form of diabetes, which is often misdiagnosed as non-insulin-dependent diabetes mellitus (NIDDM) or insulin-dependent diabetes mellitus (IDDM). Phenotypic analysis of members from four large Finnish MODY3 kindreds (linked to chromosome 12q with a maximum lod score of 15) revealed a severe impairment in insulin secretion, which was present also in those normoglycemic family members who had inherited the MODY3 gene. In contrast to patients with NIDDM, MODY3 patients did not show any features of the insulin resistance syndrome. They could be discriminated from patients with IDDM by lack of glutamic acid decarboxylase antibodies (GAD-Ab). Taken together with our recent findings of linkage between this region on chromosome 12 and an insulin-deficient form of NIDDM (NIDDM2), the data suggest that mutations at the MODY3/NIDDM2 gene(s) result in a reduced insulin secretory response, that subsequently progresses to diabetes and underlines the importance of subphenotypic classification in studies of diabetes.
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Affiliation(s)
- M Lehto
- Department of Endocrinology, Wallenberg Laboratory, Malmö University Hospital, Sweden
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