FN Archimer Export Format PT J TI Trophic environments influence size at metamorphosis and recruitment performance of Pacific oysters BT AF LAGARDE, Franck RICHARD, Marion BEC, Beatrice ROQUES, Cecile MORTREUX, Serge BERNARD, Ismael CHIANTELLA, Claude MESSIAEN, Gregory NADALINI, Jean-Bruno HORI, Masakazu HAMAGUCHI, Masami POUVREAU, Stephane ROQUE D'ORBCASTEL, Emmanuelle TREMBLAY, Rejean AS 1:1,2;2:1;3:3;4:3;5:1;6:4;7:1;8:1;9:5;10:6;11:6;12:7;13:1;14:5; FF 1:PDG-ODE-LITTORAL-LERLR;2:PDG-ODE-LITTORAL-LERLR;3:;4:;5:PDG-ODE-LITTORAL-LERLR;6:;7:PDG-ODE-LITTORAL-LERLR;8:PDG-ODE-LITTORAL-LERLR;9:;10:;11:;12:PDG-RBE-PFOM-LPI;13:PDG-ODE-LITTORAL-LERLR;14:; C1 Univ Montpellier, CNRS, IRD, MARBEC Ifremer, F-34200 Sete, France. Sorbonne Univ, Coll Doctoral, F-75005 Paris, France. Univ Montpellier, CNRS, MARBEC Ifremer, IRD, F-34095 Montpellier, France. Eureka Modelisat, F-22740 Lezardrieux, France. Univ Quebec Rimouski, Rimouski, PQ 65L 2Z9, Canada. NRIFEIS, JFREA, Hiroshima 7390452, Japan. CNRS, LEMAR Ifremer, IRD, UBO, F-29280 Plouzane, France. C2 IFREMER, FRANCE UNIV SORBONNE, FRANCE UNIV MONTPELLIER, FRANCE EUREKA MODELISAT, FRANCE UNIV QUEBEC (UQAR), CANADA NRIFEIS, JAPAN IFREMER, FRANCE CNRS, FRANCE SI SETE ARGENTON SE PDG-ODE-LITTORAL-LERLR PDG-RBE-PFOM-LPI UM LEMAR MARBEC IN WOS Ifremer jusqu'en 2018 copubli-france copubli-univ-france copubli-int-hors-europe IF 2.359 TC 12 UR https://archimer.ifremer.fr/doc/00454/56613/58314.pdf https://archimer.ifremer.fr/doc/00454/56613/58334.pdf LA English DT Article DE ;Larval ecology;Recruitment;Prodissoconch II;Crassostrea gigas;Oligotrophication;Cryptophytes;Thau lagoon AB Reproduction and recruitment of benthic invertebrates are influenced by the climate and by the ecological structure of marine ecosystems, along with local anthropogenic pressures such as eutrophication or oligotrophication. Using the Pacific oyster Crassostrea gigas as a biological model, we tested the hypothesis that the variability in prodissoconch II (PII) size (i.e. size at metamorphosis) depends on ecological functioning. Settlement and recruitment were assessed at 5 sampling sites on the French Mediterranean shellfish farmed Thau lagoon during the main summer recruitment events in 3 consecutive years (2012-2014). Hydrobiological and planktonic analyses were conducted at 3 sampling sites. Our results showed that recruitment was extremely heterogeneous, ranging from 0 to 260 ± 27 SE ind. dm-2 throughout the ecosystem and was linked with variability in PII size, which ranged from 180 to 296 µm. The annual temporal pattern of PII sizes appeared to be controlled by temperature during the settlement period, whereas the spatial pattern depended on phytoplankton biomass and on the trophic functioning of the ecosystem. Smaller PII sizes were significantly correlated with the highest phytoplankton biomass, while larger PII sizes were positively correlated with mixotrophic cryptophyte abundance. We found an inverse relationship between PII size and survival after metamorphosis, showing that recruitment success was associated with smaller PII sizes. Regional climate conditions and local trophic functioning appear to be key factors in metamorphosis and consequently contribute to recruitment heterogeneity. Further studies should be performed in other ecosystems following an oligotrophication trajectory to generalize this result. PY 2018 PD AUG SO Marine Ecology Progress Series SN 0171-8630 PU Inter-research VL 602 UT 000446468000010 BP 135 EP 153 DI 10.3354/meps12666 ID 56613 ER EF