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The accumulation of biodeposits brings about geochemical modifications of the underlying sediment, that are noticeable. The increase can reach 83% of the amount of organic carbon. By catching the deposits on the spot and by gathering them directly from the oyster tables we get a daily deposit that...Contributeur (s):
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Dans un bassin aquacole fermé (claires à huîtres), l'évolution qualitative et quantitative des matières en suspension subit des variations saisonnières directement liées aux capacité de production planctonique. Ainsi, à la fin du printemps et en été, le réchauffement des eaux s'accompagne...Contributeur (s):
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Martin, Jean-louis / Sornin, Jean-marc / Delmas, Daniel / El Sayed, Mohamed A. / Berthet, Brigitte - 1989Au cours de cette étude, nous avons étudié l'impact de la biodéposition sur les bassins conchylicoles. La biodéposition constitue un "concentrateur" de particules fines au niveau du sédiment. Cet impact est particulièrement évident sur les sédiments sableux et concerne la...Contributeur (s):
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Sornin, Jean-marc - 1981Elevated shelLfish cultures plants disturb hydrological conditions : bottom current is reduced by a factor of 2 betweeji the rack of oysters farm and by a factor of 3 between the pales of mussels farm. The amplitude of wave is also reduced. These modifications influence the sedimentary process :...Contributeur (s):
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Razet, Daniel / Heral, Maurice / Prou, Jean / Legrand, Jacqueline / Sornin, Jean-marc - 1990The continuous obtention of current (speed and direction) turbidity and phytoplanktonic fluorescence was achieved for 9 successive days during the month of May 1988. Each two hours, during the day, the faeces and pseudofaeces productions of 7 oysters have been sampled individualy. The filtration...Contributeur (s):
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Sornin, Jean-marc - 1982Most shellfish farms are located in sheltered areas which enable farmers to work whatever the weather is like as well as to limit the damages caused by storms. But these areas get some important natural sediment deposits. Looking at the height of some muddy elevations which can ruin traditional on-...Contributeur (s):
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The biodeposition was quantified on the field with sediment traps. All over the year, the biodeposition was the lowest for Crepidula fornicata. Mytilus edulis rejected more biodeposits during winter, and Crassostrea gigas during spring and autumn. The percentage of organic matter sonsumed and...Contributeur (s):
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Feuillet-girard, Michelle / Heral, Maurice / Sornin, Jean-marc / Deslous-paoli, Jean-marc / Robert, Jean-michel / Mornet, Francoise / Razet, Daniel - 1988The respective influences of the sediment and of oyster (Crassostrea gigas) farming on the accumulation and the recycling of different forms of organic and inorganic nitrogen are described. Fluxes of dissolved inorganic and organic forms of nitrogen were studied between the water column, the water...Contributeur (s):
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Sornin, Jean-marc / Collos, Yves / Delmas, Daniel / Feuillet-girard, Michèle / Gouleau, Daniel - 1990The oyster pond under study has a natural sediment bottom and water is changed only once or twice every month depending on tidal height. Between successive water renewals, the pond is a closed system, equivalent to a batch culture in which sinking and biodeposition of particulate matter are the...Contributeur (s):
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Martin, Jean-louis / Sornin, Jean-marc / Delmas, Daniel / El Sayed, Mohamed A. / Berthet, Brigitte - 1989Au cours de cette étude, nous avons étudié l'impact de la biodéposition sur les bassins conchylicoles. La biodéposition constitue un "concentrateur" de particules fines au niveau du sédiment. Cet impact est particulièrement évident sur les sédiments sableux et concerne la...Contributeur (s):
-
Dans un bassin aquacole fermé (claires à huîtres), l'évolution qualitative et quantitative des matières en suspension subit des variations saisonnières directement liées aux capacité de production planctonique. Ainsi, à la fin du printemps et en été, le réchauffement des eaux s'accompagne...Contributeur (s):
-
Sornin, Jean-marc - 1982Most shellfish farms are located in sheltered areas which enable farmers to work whatever the weather is like as well as to limit the damages caused by storms. But these areas get some important natural sediment deposits. Looking at the height of some muddy elevations which can ruin traditional on-...Contributeur (s):
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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-...Contributeur (s):
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The accumulation of biodeposits brings about geochemical modifications of the underlying sediment, that are noticeable. The increase can reach 83% of the amount of organic carbon. By catching the deposits on the spot and by gathering them directly from the oyster tables we get a daily deposit that...Contributeur (s):
-
Razet, Daniel / Heral, Maurice / Prou, Jean / Legrand, Jacqueline / Sornin, Jean-marc - 1990The continuous obtention of current (speed and direction) turbidity and phytoplanktonic fluorescence was achieved for 9 successive days during the month of May 1988. Each two hours, during the day, the faeces and pseudofaeces productions of 7 oysters have been sampled individualy. The filtration...Contributeur (s):