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Approche de la capacité trophique dans le bassin ostréicole (Baie de Bourgneuf) ArchiMer
Haure, Joel; Baud, Jean-pierre.
A hydrobiological study coupled with the evolution of the production of cupped oysters Crassostrea gigas has been carried out from March 1990 to March 1991 on two oyster culture areas (North and South) of the Bay of Bourgneuf. - The northern area is characterized by an environment which is variable though time and composed of a high nutritive and mineral load. This high particular load (average value = 154 mg.l- 1) is linked to meteorological conditions and especially to the wind speed and direction. The individual growth of cultivated oysters is low (i.e.: 58.8 g). - The southern area shows homogenous hydrobiological characteristics throughout the year. The average phytoplanktonic biomass is 4.4 µg.l-l of chlorophyll and the particular load is low...
Tipo: Text Palavras-chave: Hydrobiology; Trophic capacity; Crassostrea gigas; Bay of Bourgneuf; Hydrobiologie; Capacité trophique; Crassostrea gigas; Baie de Bourgneuf.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/rapport-6441.PDF
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Capacité trophique du bassin de Marennes-Oléron : couplage d'un modèle de transport particulaire et d'un modèle de croissance de l'huître Crassostrea gigas ArchiMer
Bacher, Cedric.
The trophic relationship between a population of cultivated oysters and potential food was modeled in Marennes-Oleron Bay. Coupling the transport process of particulate matter with assimilation by a population of oysters was achieved through a box mode!. Transport between boxes was based on a mass conservation equation. Parameters were derived from volumes of the boxes, tidal movements and residual 110ws between boxes, and were computed from a numerical hydrodynamical model. Consumption, assimilation and respiration terms were put into an energetic budget equation which enabled simulation of growth. A result of the model was the variability of growth along an axis from North to South, which was related to the oysters' accumulated consumption of food....
Tipo: Text Palavras-chave: Marennes Oleron Bay; Growth; Energetic budget; Crassostrea gigas; Trophic capacity; Box model; Marennes Oléron; Croissance; Bilan énergétique; Crassostrea gigas; Capacité trophique; Modèle en boîtes.
Ano: 1989 URL: http://archimer.ifremer.fr/doc/1989/publication-2882.pdf
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Feeding response of the polychaete Sabellaria alveolata (Sabellariidae) to changes in seston concentration ArchiMer
Dubois, Stanislas; Barille, Laurent; Cognie, Bruno.
Sabellaria alveolata is a tube-building gregarious polychaete that constructs large biogenic reefs. In macrotidal shellfish ecosystems, this species competes for food with cultivated suspension-feeders. The suspension-feeding activity and clearance rate of S. alveolata were investigated in response to changes in seston concentration. A flow-through system was designed to study 225 cm(2) reef blocks with more than 500 individuals. The experimental conditions were characterized by increasing concentrations of suspended particulate matter ranging from 6.5 to 153.8 mg L-1, while the organic content of the diet (microalgae Skeletonema costatum) decreased inversely from 49 to 9%, to mimic the dilution of organic matter by inorganic particles, characteristic of...
Tipo: Text Palavras-chave: Bay of Mont Saint Michel; Tubiculous polychaete; Trophic capacity; Suspension feeders; Reefs; Feeding activity.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6778.pdf
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Integration of shellfish farming activies in three French coastal environments : Mont Saint-Michel Bay, Gulf of Morbihan, and Marennes-Oleron Bay ArchiMer
Mazurie, Joseph; Le Mao, Patrick; Camus, Patrick; Bacher, Cedric; Goulletquer, Philippe.
Integration of shellfish farming along the French shoreline (around 5500 km) has been progressive, as marine bivalve culture is a traditional activity in our country. The history of mussel culture relates that the "bouchot" technique (intertidal culture on wooden poles, producing annually around 60,000 tons) was developed as early as the XIIIth century, by a refugee attempting to capture birds by sticking branches of brushwood along the shore. The European flat oyster, Ostrea edulis, already appreciated at the Roman period, was first cultivated in France after Victor Coste introduced the technique of spat collection at the end of the XIXth century. The Pacific cupped oyster, genus Crassostrea, now the most-cultivated in France (around 120,000 tons marketed...
Tipo: Text Palavras-chave: Trophic capacity; Trophic resource; Nature conservation; Coastal zone management; Biodiversity; Mytilus edulis; Mussels; Integration; Ostrea edulis; Crassostrea gigas; Oysters.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/acte-3400.pdf
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