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Construction et étude d'un modèle de réseau trophique de la vasière de Brouage (bassin de marennes Oléron, France). Prise en compte de la saisonnalité et des échanges physiques pour la synthèse constructive des connaissances sur une zone intertidale d'une région tempérée. ArchiMer
Leguerrier, Dephine.
In order to better understand the functioning of the Brouage intertidal mudflat (Marennes- Oléron Basin, France), its carbon-based trophic web has been modelled and analyzed. The foodweb building is based on the 4 step method of Inverse Analysis: 1) conceive an a priori model as the graph of compartments (nodes) between which exist fluxes of material (vertices). These vertices are the unknowns for the problem; 2) gather all the existing knowledge about the ecosystem and translate it into linear equations and inequalities involving the fluxes; 3) complete this set of data by common knowledge on the behaviour of the compartments and translate it into inequalities, 4) solve the obtained linear system under the parsimony principle to find a unique solution...
Tipo: Text Palavras-chave: Brouage Mudflat; Box Model; Seasonality; Dynamic Model; Static Model; Monte Carlo; Markov Chains; Network Analysis; Intertidal Mudflat; Food Web; Inverse Analysis; Vasière de Brouage; Modèle en boîtes; Saisonnalité; Modèle Dynamique; Modèle Statique; Monte Carlo; Chaînes de Markov; Analyse des Réseaux; Vasière Intertidale; Réseau Trophique; Analyse Inverse.
Ano: 2005 URL: http://archimer.ifremer.fr/doc/2005/these-2260.pdf
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Dynamics of an estuarine nursery ground: the spatio-temporal relationship between the river flow and the food web of the juvenile common sole (Solea solea, L.) as revealed by stable isotopes analysis ArchiMer
Kostecki, Caroline; Le Loc'H, F.; Roussel, J. -m.; Desroy, Nicolas; Huteau, D.; Riera, Pascal; Le Bris, H.; Le Pape, Olivier.
Estuaries are essential fish habitats because they provide nursery grounds for a number of marine species. Previous studies in the Bay of Vilaine (part of the Bay of Biscay, France) have underlined the estuarine dependence of juvenile common sole (Solea solea, L) and shown that the extent of sole nursery grounds was positively influenced by the variability of the river flow. In the present study, stable carbon and nitrogen isotopes were used to describe the trophic network until the young-of-the-year sole and to compare interannual variations in the dominant trophic pathways in the sole nursery areas in this bay. Particulate organic matter (POM), sediment organic matter (SOM), microphytobenthos, benthic invertebrate sole prey and young-of-the-year common...
Tipo: Text Palavras-chave: Juvenile Common Sole; Stable Isotopes; Estuarine Nursery Grounds; Food Web; Eastern Atlantic.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00008/11923/8641.pdf
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