| Registro completo |
| Provedor de dados: |
ArchiMer
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| País: |
France
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| Título: |
Heterotrophic protists as a trophic link between picocyanobacteria and the pearl oyster Pinctada margaritifera in the Takapoto lagoon (Tuamotu Archipelago, French Polynesia)
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| Autores: |
Loret, Pascale
Le Gall, Solange
Dupuy, Christine
Blanchot, Jean
Pastoureaud, Annie
Delesalle, Bruno
Caisey, Xavier
Jonquieres, Gerard
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| Data: |
2000-10
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| Ano: |
2000
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| Palavras-chave: |
Trophic resource
Picoplankton
Pinctada margaritifera
Pearl oysters
Atoll lagoon
Protists
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| Resumo: |
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 rates (ca 20 l h(-1) g(-1)) the pearl oyster retained 85 mug C h(-1) g(-1) from ciliates and 55 mug C h(-1) g(-1) from dinoflagellates. Conversely, cyanobacteria were not efficiently retained by the bivalve and did not efficiently contribute to its diet. From our experiments, we concluded that hetero/mixotrophic protists rapidly and efficiently process the picoplanktonic resource towards filter-feeders, particularly pearl oysters.
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| Tipo: |
Text
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| Idioma: |
Inglês
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| Identificador: |
http://archimer.ifremer.fr/doc/2000/publication-823.pdf
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| Editor: |
Inter-Research
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| Relação: |
http://archimer.ifremer.fr/doc/00000/823/
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| Formato: |
application/pdf
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| Fonte: |
Aquatic Microbial Ecology (0948-3055) (Inter-Research), 2000-10 , Vol. 22 , N. 3 , P. 215-226
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| Direitos: |
2000 Inter-Research
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