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Can fish morphology determine its diet? ArchiMer
Chambord, Sophie; Villanueva, Ching-maria; Ernande, Bruno; Lefebvre, Sébastien.
Biodiversity is a concept that covers a lot of issues that can elucidate diversity-related functional roles to understand ecological ecosystem functioning. Biodiversity can shape ecosystem structure and functioning especially if we focus on predator-prey interactions. Moreover, the mechanisms governing prey-predator relationships will shape the emergent food web structure just as individuals’ characteristics determine the emergent demographic structure of a population. We determined the trophic ecology of fish species in the eastern English Channel by combining gut-content and geomorphometric analyses. We inferred the mechanisms of resource utilisation by Atlantic seabass and plaice by coupling measured geomorphometric determinants of prey-predator...
Tipo: Text Palavras-chave: Biodiversity; Predator-prey interaction; Eastern English Channel Stomach content analysis Geomorphometry Fish.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00143/25416/23567.pdf
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Modelling the influence of environmental factors on the physiological status of the Pacific oyster Crassostrea gigas in an estuarine embayment; The Baie des Veys (France) ArchiMer
Grangere, Karine; Menesguen, Alain; Lefebvre, Sébastien; Bacher, Cedric; Pouvreau, Stephane.
It is well known that temporal changes in bivalve body mass are strongly correlated with temporal variations in water temperature and food supply. In order to study the influence of the year-to-year variability of environmental factors on oyster growth, we coupled a biogeochemical sub-model, which simulates trophic resources of oysters (i.e. phytoplankton biomass via chlorophyll a), and an ecophysiological sub-model, which simulates growth and reproduction (i.e. gametogenesis and spawning), using mechanistic bases. The biogeochemical sub-model successfully simulated phytoplankton dynamics using river nutrient inputs and meteorological factors as forcing functions. Adequate simulation of oyster growth dynamics requires a relevant food quantifier compatible...
Tipo: Text Palavras-chave: Baie des Veys; Normandy; France; Physiological Status; Phytoplankton Carbon Concentration; Food Supply; Temperature; Dynamic Energy Budget model; Biogeochemical Model.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6809.pdf
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Open-air treatment of wastewater from land-based marine fish farms in extensive and intensive systems: current technology and future perspectives ArchiMer
Hussenot, Jerome; Lefebvre, Sébastien; Brossard, Nicolas.
Marine land-based fish farms located in coastal wetlands (salt-pond zones, lagoon banks, etc.), whether extensive or intensive, send farm effluents directly to the sea or after short periods of stocking in retention reservoirs. The aims of our investigation have been to compare the efficiency of current and potential water treatment procedures in open-air. Wastewater retention ponds in commercial farms (Atlantic coasts of France) are efficient in removing up to 1 metric ton of particulate material (dry weight) per hectare and per day (faeces and unconsumed feed), but are inefficient in reducing dissolved wastes, both organic (urea, amino acids, protein) and inorganic (total ammonia nitrogen, phosphates). Forthcoming outdoor technology to treat these forms...
Tipo: Text Palavras-chave: Traitement de l'eau; Effluent; Décantation; Sédimentation; Écumage; Microalgue; Huître; Water treatment; Effluent; Aquaculture; Sedimentation; Foam fractionation; Microalgae; Oyster.
Ano: 1998 URL: https://archimer.ifremer.fr/doc/1998/publication-873.pdf
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Small-scale spatial variability of food partitioning between cultivated oysters and associated suspension-feeding species, as revealed by stable isotopes ArchiMer
Dubois, Stanislas; Orvain, Francis; Marin Leal, Julio César; Ropert, Michel; Lefebvre, Sébastien.
Oyster culture structures support a host of epibionts belonging to the same suspension-feeding guild, which are considered to be potential competitors for food with cultivated oysters. In an intertidal shellfish ecosystem on the northern French coast, an approach based on stable isotopes (C-13 and N-15) was used to investigate intra- and interspecific food resource partitioning among cultivated oysters and the main associated wild sessile epibionts such as polychaetes, barnacles, mussels and ascidians. The main objective of the present study was to determine inter- and intraspecific food partitioning, along with small-scale spatial variability, within the guild of suspension feeders. We demonstrated that interspecific competition was limited among...
Tipo: Text Palavras-chave: Trophic plasticity; Spatial variability; Stable isotopes; Sessile epibionts; Oysters; Shellfish.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-2626.pdf
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