Laboratório de Conservação e Biologia Evolutiva, Instituto de Estudos Costeiros, Campus de Bragança, Universidade Federal do Pará, Bragança, PA Brazil.
Genet Mol Biol. 2010 Jul;33(3):564-72. doi: 10.1590/S1415-47572010000300030. Epub 2010 Sep 1.
Oysters (Ostreidae) manifest a high degree of phenotypic plasticity, whereby morphology is of limited value for species identification and taxonomy. By using molecular data, the aim was to genetically characterize the species of Crassostrea occurring along the Brazilian coast, and phylogenetically relate these to other Crassostrea from different parts of the world. Sequencing of the partial cytochrome oxidase c subunit I gene (COI), revealed a total of three species of Crassostrea at 16 locations along the Brazilian coast. C. gasar was found from Curuçá (Pará state) to Santos (São Paulo state), and C. rhizophorae from Fortim (Ceará state) to Florianópolis (Santa Catarina state), although small individuals of the latter species were also found at Ajuruteua beach (municipality of Bragança, Pará state). An unidentified Crassostrea species was found only on Canela Island, Bragança. Crassostrea gasar and C. rhizophorae grouped with C. virginica, thereby forming a monophyletic Atlantic group, whereas Crassostrea sp. from Canela Island was shown to be more similar to Indo-Pacific oysters, and either arrived in the Atlantic Ocean before the convergence of the Isthmus of Panama or was accidentally brought to Brazil by ship.
牡蛎（Ostreidae）表现出高度的表型可塑性，因此形态学在物种鉴定和分类学方面的价值有限。本研究旨在利用分子数据对巴西沿海的牡蛎进行遗传特征分析，并将这些物种与世界其他地区的其他牡蛎进行系统发育关系分析。对部分细胞色素氧化酶亚基 I 基因（COI）的测序，在巴西沿海的 16 个地点共发现了 3 种牡蛎。Crassostrea gasar 从帕拉州的库里奇巴（Curuçá）到圣保罗州的桑托斯（Santos），C. rhizophorae 从塞阿拉州的福蒂姆（Fortim）到圣卡塔琳娜州的弗洛里亚诺波利斯（Florianópolis），尽管在帕拉州的阿茹图埃瓦海滩（Ajuruteua beach）也发现了后者的小个体。在布拉干萨的卡内拉岛（Canela Island）只发现了一种未鉴定的牡蛎。Crassostrea gasar 和 C. rhizophorae 与 C. virginica 聚在一起，形成一个单系的大西洋群，而卡内拉岛的牡蛎与印度洋-太平洋牡蛎更为相似，要么是在巴拿马地峡合拢之前就已经到达大西洋，要么是偶然被船只带到巴西。
