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Phytoplankton composition and selective feeding of the pearl oyster Pinctada margaritifera in the Takapoto lagoon (Tuamotu Archipelago, French Polynesia): in situ study using optical microscopy and HPLC pigment analysis ArchiMer
Loret, P; Pastoureaud, Annie; Bacher, Cedric; Delesalle, B.
The in situ diet of the pearl oyster Pinctada margarifera was determined in the lagoon of Takapoto Atoll by comparing the phytoplankton composition of water and bivalve gut contents using 2 different methods, optical microscopy and HPLC pigment analysis. In order to evaluate the available food resources for pearl oysters in the water column, a new method for estimating the pigment/chlorophyll a (chl a) ratio (based on an inverse analysis) was developed which allowed us to determine the contribution of the main phytoplanktonic groups in terms of chi a. In the water, picocyanobacteria and nanoflagellates predominated, the latter being mainly chlorophytes and prymnesiophytes. Comparisons between the results obtained by the 2 methods of investigation indicated...
Tipo: Text Palavras-chave: Pearl oyster Pinctada margaritifera; Selective feeding; Natural diet; Phytoplankton pigments; Coral reefs; French Polynesia.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00000/10992/7606.pdf
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