FN Archimer Export Format PT J TI Heterotrophic protists as a trophic link between picocyanobacteria and the pearl oyster Pinctada margaritifera in the Takapoto lagoon (Tuamotu Archipelago, French Polynesia) BT AF LORET, Pascale LE GALL, Solange DUPUY, Christine BLANCHOT, Jean PASTOUREAUD, Annie DELESALLE, Bruno CAISEY, Xavier JONQUIERES, Gerard AS 1:;2:;3:;4:;5:;6:;7:;8:; FF 1:;2:;3:;4:;5:PDG-DEL-ST;6:;7:PDG-DEL-PC;8:PDG-DRV-RA-DCOP-AT; C1 Univ Perpignan, URA CNRS 1453, EPHE, F-66860 Perpignan, France. CREMA, F-17137 Lhoumeau, France. Univ La Rochelle, LBEM, F-17042 La Rochelle, France. IRD, Stn Biol Roscoff, F-29682 Roscoff, France. IFREMER, COP, Tahiti, Fr Polynesia. C2 UNIV PERPIGNAN, FRANCE IFREMER, FRANCE UNIV LA ROCHELLE, FRANCE IRD, FRANCE IFREMER, FRANCE SI LA ROCHELLE SETE BREST TAHITI SE PDG-DRV-RA-CREMA PDG-DEL-ST PDG-DEL-PC PDG-DRV-RA-DCOP-AT IN WOS Ifremer jusqu'en 2018 copubli-univ-france IF 2.19 TC 33 UR https://archimer.ifremer.fr/doc/2000/publication-823.pdf LA English DT Article DE ;Trophic resource;Picoplankton;Pinctada margaritifera;Pearl oysters;Atoll lagoon;Protists AB 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. PY 2000 PD OCT SO Aquatic Microbial Ecology SN 0948-3055 PU Inter-Research VL 22 IS 3 UT 000165351700001 BP 215 EP 226 ID 823 ER EF