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Dynamique de la diversité fonctionnelle des communautés de poissons (lagune de Terminos, Mexique) ArchiMer
Villeger, Sébastien.
One of the main challenges in ecology is to understand how global changes affect biodiversity and what are the consequences on ecosystem functioning. In this perspective, the functional diversity of communities is a cornerstone since it allows linking environment, community structure and ecosystem properties. The aim of this thesis is thus to improve the understanding of functional diversity dynamic (i) in relation to natural variability of environmental conditions and (ii) under anthropogenic disturbances. As a first step we have developed a new methodological framework allowing to (1) describe fish functional niches based on functional traits, and (2) to quantify functional diversity within (α) and among (β) sites thanks to new indices....
Tipo: Text Palavras-chave: Gulf of Mexico; Nekton; Teleostian; Global changes; Environmental gradient; Estuarine ecosystem; Functional diversity indices; Functional traits; Golfe du Mexique; Necton; Téléostéens; Changements globaux; Gradient environnemental; Écosystème estuarien; Indices de diversité fonctionnelle; Traits fonctionnels.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6178.pdf
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Evolution and challenges of dynamic global vegetation models for some aspects of plant physiology and elevated atmospheric CO2. Repositório Alice
REZENDE, L. F. C.; ARENQUE, B. C.; AIDAR, S. de T.; MOURA, M. S. B. de; RANDOW, C. V.; TOURIGNY, E.; MENEZES, R. S. C.; OMETTO, J. P. H. B..
Dynamic global vegetation models (DGVMs) simulate surface processes such as the transfer of energy, water, CO2, and momentum between the terrestrial surface and the atmosphere, biogeochemical cycles, carbon assimilation by vegetation, phenology, and land use change in scenarios of varying atmospheric CO2 concentrations. DGVMs increase the complexity and the Earth system representation when they are coupled with atmospheric global circulation models (AGCMs) or climate models. However, plant physiological processes are still a major source of uncertainty in DGVMs. The maximum velocity of carboxylation (Vcmax), for example, has a direct impact over productivity in the models. This parameter is often underestimated or imprecisely defined for the various plant...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: DGVMs; Vegetação; Mudanças climáticas; Global changes; Maximumvelocity of carboxylation; Acclimation.
Ano: 2016 URL: http://www.alice.cnptia.embrapa.br/handle/doc/1053980
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Spatial variations in biomarkers of Mytilus edulis mussels at four polluted regions spanning the Northern Hemisphere ArchiMer
Gagne, F; Burgeot, Thierry; Hellou, J; St Jean, S; Farcy, E; Blaise, C.
Economic and social developments have taken place at the expense of the health of the environment, both locally and on a global scale. In an attempt to better understand the large-scale effects of pollution and other stressors like climate change on the health status of Mytilus edulis, mussels were collected during the first two weeks of June 2005 at three sites (one pristine and two affected by pollution) located in each of the regions of the Canadian West Coast, the St. Lawrence estuary, the Atlantic East Coast and the northwestern coast of France, covering a total distance of some I 1000 km. The mussels were analyzed for morphologic integrity (condition factor), gametogenic activity (gonado-somatic and gonad maturation index, vitellogenin(Vtg)-like...
Tipo: Text Palavras-chave: Health status; Mytilus edulis; Global changes; Pollution; Biomarkers.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4342.pdf
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