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Influence of oyster farming Crassostrea gigas on the phosphate cycle in an intertidal zone : the role of biodeposition ArchiMer
Sornin, Jean-marc; Feuillet, Michelle; Heral, Maurice; Fardeau, Jean-claude.
Some aspects of the phosphorus cycle were studied in the estuarine bay of Marennes, Oléron, an area of intensive cultivation of Crassostrea gigas on the west coast of France. The annual cycle of dissolved phosphorus (mineral and organic) in the water column, interstitial water and at the sediment-water interface was followed, as well as the particulate phosphorus (total and assimilable) in sediments and in suspension. A comparison of the seasonal variations in these different forms of phosphorus in the suspended matters shows a deficit in "biodeposits" (sedimented faeces and pseudofaeces from Crassostrea gigas) equivalent to 20 mg.m -2.d -1 for assimilable phosphorus in July and September-October. This may be the result of consumption by the oysters, since...
Tipo: Text Palavras-chave: Phosphore; Crassoslrea gigas; Biodéposition; Dilution isotopique; Marennes-Oléron; Phosphorus; Crassostrea gigas; Biodeposition Isotopic; Dilution; Marennes-Oléron.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/1986/publication-2973.pdf
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Ecophysiological deterministic model for Crassostrea gigas in an estuarine environment ArchiMer
Barille, Laurent; Heral, Maurice; Barilleboyer, Al.
An ecophysiological deterministic model of growth, reproduction and interactions between the bivalve and its estuarine environ ment was established for the Japanese oyster Crassostrea gigas. The environmental variables used in the model are: total particulate matter, particulate organic matter, particulate inorganic matter, chlorophyll, phaeopigments, proteins, lipids and carbohydrates. Rates of clearance, filtration, ingestion, absorption and respiration along with efficiencies of retention, selection and absorption are modelled with endogenous (dry weight of the animal, energy allocation between growth and reproduction) and exogenous variables (temperature, food quality and quantity). The model simulate the temporal evolution of two compartments: somatic...
Tipo: Text Palavras-chave: Crassoslrea gigas; Croissance; Écophysiologie; Modélisation; Turbidité; Crassostrea gigas; Ecophysiology; Growth; Modelling; Turbidity.
Ano: 1997 URL: http://archimer.ifremer.fr/doc/00038/14892/12219.pdf
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