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Registros recuperados: 7
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A dynamic and mechanistic model of PCB bioaccumulation in the European hake (Merluccius merluccius) ArchiMer
Bodiguel, Xavier; Maury, Olivier; Mellon-duval, Capucine; Roupsard, Francois; Le Guellec, Anne-marie; Loizeau, Veronique.
Bioaccumulation is difficult to document because responses differ among chemical compounds, with environmental conditions, and physiological processes characteristic of each species. We use a mechanistic model, based on the Dynamic Energy Budget (DEB) theory, to take into account this complexity and study factors impacting accumulation of organic pollutants in fish through ontogeny. The bioaccumulation model proposed is a comprehensive approach that relates evolution of hake PCB contamination to physiological information about the fish, such as diet, metabolism, reserve and reproduction status. The species studied is the European hake (Merluccius merluccius, L. 1758). The model is applied to study the total concentration and the lipid normalised...
Tipo: Text Palavras-chave: Dynamic Energy Budget (DEB) Bioaccumulation model; Bioenergetic Polychlorinated biphenyls (PCB) Demersal fish Merluccius merluccius.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6789.pdf
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Biogeography of tuna and billfish communities ArchiMer
Reygondeau, Gabriel; Maury, Olivier; Beaugrand, Gregory; Fromentin, Jean-marc; Fonteneau, Alain; Cury, Philippe.
Aim The aims of this study were: (1) to identify global communities of tuna and billfish species through quantitative statistical analyses of global fisheries data; (2) to describe the spatial distribution, main environmental drivers and species composition of each community detected; and (3) to determine whether the spatial distribution of each community could be linked to the environmental conditions that affect lower trophic levels by comparing the partitions identified in this study with Longhursts biogeochemical provinces. Location The global ocean from 60 degrees S to 65 degrees N. Methods We implemented a new numerical procedure based on a hierarchical clustering method and a nonparametric probabilistic test to divide the oceanic biosphere into...
Tipo: Text Palavras-chave: Biogeochemical provinces; Global ocean; Istiophorus; Katsuwonus; Macroecology; Makaira; Marine biogeography; Tetrapturus; Thunnus; Xiphias.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00060/17141/14716.pdf
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Differing marine animal biomass shifts under 21st century climate change between Canada’s three oceans ArchiMer
Bryndum-buchholz, Andrea; Prentice, Faelan; Tittensor, Derek P.; Blanchard, Julia L.; Cheung, William W.l.; Christensen, Villy; Galbraith, Eric D.; Maury, Olivier; Lotze, Heike K.; Favaro, Brett.
Under climate change, species composition and abundances in high-latitude waters are expected to substantially reconfigure with consequences for trophic relationships and ecosystem services. Outcomes are challenging to project at national scales, despite their importance for management decisions. Using an ensemble of six global marine ecosystem models we analyzed marine ecosystem responses to climate change from 1971 to 2099 in Canada’s Exclusive Economic Zone (EEZ) under four standardized emissions scenarios. By 2099, under business-as-usual emissions (RCP8.5) projected marine animal biomass declined by an average of −7.7% (±29.5%) within the Canadian EEZ, dominated by declines in the Pacific (−24% ± 24.5%) and Atlantic (−25.5% ± 9.5%) areas; these were...
Tipo: Text Palavras-chave: Climate change; Ensemble modeling; Marine ecosystem models; Canada Exclusive Economic Zone; Fish-MIP; Projection uncertainty.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00613/72464/71425.pdf
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Indian Ocean Dipole and El Nino/Southern Oscillation impacts on regional chlorophyll anomalies in the Indian Ocean ArchiMer
Currie, J. C.; Lengaigne, M.; Vialard, Jerome; Kaplan, David; Aumont, Olivier; Naqvi, S. W. A.; Maury, Olivier.
The Indian Ocean Dipole (IOD) and the El Nino/Southern Oscillation (ENSO) are independent climate modes, which frequently co-occur, driving significant interannual changes within the Indian Ocean. We use a four-decade hindcast from a coupled biophysical ocean general circulation model, to disentangle patterns of chlorophyll anomalies driven by these two climate modes. Comparisons with remotely sensed records show that the simulation competently reproduces the chlorophyll seasonal cycle, as well as open-ocean anomalies during the 1997/1998 ENSO and IOD event. Results suggest that anomalous surface and euphotic-layer chlorophyll blooms in the eastern equatorial Indian Ocean in fall, and southern Bay of Bengal in winter, are primarily related to IOD forcing....
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00166/27749/25945.pdf
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Influence of mesoscale eddies on biological production in the Mozambique Channel: Several contrasted examples from a coupled ocean-biogeochemistry model ArchiMer
Jose, Yonss; Aumont, Olivier; Machu, Eric; Penven, Pierrick; Moloney, C. L.; Maury, Olivier.
The impact of mesoscale activity on phytoplankton and nutrient distribution in the Mozambique Channel was simulated by coupling a biogeochemical model (PISCES) with a regional oceanic model (ROMS). Examples of the effects of eddies on the biogeochemistry of the Mozambique Channel are presented to illustrate the complexity of the system. In the model, several cyclonic eddies were found with low concentrations of chlorophyll at their cores, which contrasts with previous studies in the open ocean. In addition, several anticyclonic eddies were simulated with high concentrations of chlorophyll at their cores. Phytoplankton growth within these mesoscale features (both cyclonic and anticyclonic eddies) occurred in response to nutrient injection into the euphotic...
Tipo: Text Palavras-chave: Ocean physical-biogeochemical coupling; Cyclonic and anticyclonic eddies; Chlorophyll; Nutrients; Mozambique Channel.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00162/27320/25549.pdf
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The True Challenge of Giant Marine Reserves ArchiMer
Kaplan, David; Bach, Pascal; Bonhommeau, Sylvain; Chassot, Emmanuel; Chavance, Pierre; Dagorn, Laurent; Davies, Tim; Dueri, Sibylle; Fletcher, Rick; Fonteneau, Alain; Fromentin, Jean-marc; Gaertner, Daniel; Hampton, John; Hilborn, Ray; Hobday, Alistair; Kearney, Robert; Kleiber, Pierre; Lehodey, Patrick; Marsac, Francis; Maury, Olivier; Mees, Chris; Menard, Frederic; Pearce, John; Sibert, John.
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Ano: 2013 URL: http://archimer.ifremer.fr/doc/00139/25068/23186.pdf
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Un modèle d'advection-diffusion-réaction forcé par l'environnement : application à la population de thons albacores (Thunnus albacares) de l'Atlantique : étude du phénomène de surexploitation locale IRD
Maury, Olivier; Gascuel, D.; Fonteneau, Alain.
L'objet de l'article est la présentation d'un modèle spatialisé forcé par l'environnement de la population de thons albacore de l'Atlantique. Le modèle s'appuie sur des relations non linéaires estimées par modélisation additive généralisée (GAM) caractérisant, d'une part les préférences environnementales des albacores et d'autre part leur capturabilité à différents engins. Formulées analytiquement, les relations caratéristiques des préférences environnementales des albacores sont utilisées pour forcer un modèle d'advection-diffusion-réaction des albacores. Egalement formulées analytiquement, les relations caractérisant la capturabilité à différents engins permettent d'envisager l'ajustement du modèle aux captures observées. Le modèle permet de simuler la...
Tipo: Text Palavras-chave: THON; DYNAMIQUE DE POPULATION; CAPTURE; MORTALITE PAR PECHE; MORTALITE; SIMULATION; REPARTITION GEOGRAPHIQUE; PECHE THONIERE; SURPECHE; BIOTOPE; THERMOCLINE; BIOMASSE; ABONDANCE; MODELE MATHEMATIQUE; MODELISATION.
Ano: 2000 URL: http://www.documentation.ird.fr/hor/fdi:010024494
Registros recuperados: 7
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