FN Archimer Export Format PT J TI Quality Trait Signature at Archipelago Scale of the Cultured Pearls Produced by the Black-Lipped Pearl Oyster (Pinctada margaritifera Var. cumingi) in French Polynesia BT AF KY, Chin-Long OKURA, Retsu NAKASAI, Seiji DEVAUX, Dominique AS 1:1;2:2;3:3;4:2,3; FF 1:PDG-RBE-RMPF;2:;3:;4:; C1 IFREMER, UMR 241, EIO, Labex Corail,Ctr Pacifique, BP 7004, F-98719 Tahiti, Polynesie Franc, France. Grp Interet Econ Poe O Rikitea, BP 176, F-98755 Gambier, Polynesie Franc, France. SCA Regahiga Pearls, BP 48, F-98755 Gambier, Polynesie Franc, France. C2 IFREMER, FRANCE GRP INTERET ECON POE O RIKITEA, FRANCE SCA REGAHIGA PEARLS, FRANCE SI TAHITI SE PDG-RBE-RMPF UM EIO IN WOS Ifremer jusqu'en 2018 copubli-france IF 0.721 TC 10 UR https://archimer.ifremer.fr/doc/00357/46798/46665.pdf LA English DT Article DE ;pearl oyster;Pinctada margaritifera;large-scale geographic effects;pearl color;pearl grade;pearl shape;pearl size AB In French Polynesia, the aquaculture of Pinctada margaritifera (Linnaeus, 1758) covers a large maritime exploitation area, spread over nearly 20 degrees latitude and longitude, with numerous pearl farms located in three archipelagos (Gambier, Society, and Tuamotu). As these archipelagos have specific seasonal temperature patterns each year, pearl oysters are subject to disparate and contrasting environmental regimes. This study aimed to examine the specificity of commercial pearl quality traits (n ¼ 2,236 samples) at the archipelago scale, in such a way as to provide preliminary data to design the most appropriate strategy for the distribution of hatchery-produced phenotypes. A large and standardized grafting experiment using the same donor phenotype was designed and carried out over six grow-out locations, covering the three archipelagos. Results revealed significant differences in commercial pearl quality traits among archipelagos, giving these groups of growing sites distinctive ‘‘signatures’’: (1) more color, less circles, and higher overall pearl grade in Gambier; (2) larger size with paler pearls in Tuamotu; and (3) darker pearls with intermediate size in Society. Characteristic differences in the environment and seasonal temperature ranges among the three archipelagos, corresponding to their distinct environmental conditions, can explain the specific variations between pearl quality traits among the sites. The strong disparities at archipelago scale should be taken into account in selective breeding programs for P. margaritifera so as to choose the most appropriate pearl oyster donor phenotype for use in each environment and thus enhance site-specific qualities for pearl production. PY 2016 PD DEC SO Journal Of Shellfish Research SN 0730-8000 PU Natl Shellfisheries Assoc VL 35 IS 4 UT 000398959000010 BP 827 EP 835 DI 10.2983/035.035.0410 ID 46798 ER EF