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| Loret, Pascale; Le Gall, Solange; Dupuy, Christine; Blanchot, Jean; Pastoureaud, Annie; Delesalle, Bruno; Caisey, Xavier; Jonquieres, Gerard. |
| Pearl oysters are farmed in oligotrophic tropical atoll lagoons where planktonic communities are dominated by production from cyanobacteria smaller than 2 pm. Paradoxically, the pearl oyster Pinctada margaritifera only retains particles larger than 2 Pm. In this study, we assess the relative contribution of hetero/mixotrophic microbiota to the available planktonic resource. In Takapoto Atoll, picocyanobacteria are the dominant biomass (20 mug C l(-1)). The carbon biomass of ciliates and dinoflagellates ranges from 1 to 24 and 0.5 to 5 mug C l(-1) respectively, with a mean of 6 mug C l(-1) for ciliates and 2 mug C l(-1) for dinoflagellates. The possible retention by P. margaritifera on a natural protist suspension was investigated. Due to its high clearance... |
| Tipo: Text |
Palavras-chave: Trophic resource; Picoplankton; Pinctada margaritifera; Pearl oysters; Atoll lagoon; Protists. |
| Ano: 2000 |
URL: http://archimer.ifremer.fr/doc/2000/publication-823.pdf |
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| Loret, Pascale. |
| Until now, the diet preferences study of the pearl oyster Pinctada margaritifera was carried out on animais maintained in the peripheric lagoon of a volcanic island (Vairao, Tahiti). In this study, the diet was assessed in the natural habitat of the pearl oyster (Iagoon of the Takapoto atoll). Analysis and sampling procedures were specifically adapted to the method of data analysis employed. The phytoplanctonic species panel available for the pearl oyster was determined by the detailed analysis of water samples.The midgut contents faeces and pseudofaeces were compared between each othre and with the seawater floristic composition. The pearl oyster was found to actively select its food. |
| Tipo: Text |
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| Ano: 1995 |
URL: http://archimer.ifremer.fr/doc/00424/53549/54410.pdf |
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