Bourjea J, Lapègue S, Gagnevin L, Broderick D, Mortimer J A, Ciccione S, Roos D, Taquet C, Grizel H
Institut Français de Recherche pour l'Exploitation de la Mer (Ifremer) de La Réunion, Rue Jean Bertho, BP 60, 97 822 Le Port Cedex, Ile de La Réunion, France.
Mol Ecol. 2007 Jan;16(1):175-86. doi: 10.1111/j.1365-294X.2006.03122.x.
Patterns of mitochondrial DNA (mtDNA) variation were used to analyse the population genetic structure of southwestern Indian Ocean green turtle (Chelonia mydas) populations. Analysis of sequence variation over 396 bp of the mtDNA control region revealed seven haplotypes among 288 individuals from 10 nesting sites in the Southwest Indian Ocean. This is the first time that Atlantic Ocean haplotypes have been recorded among any Indo-Pacific nesting populations. Previous studies indicated that the Cape of Good Hope was a major biogeographical barrier between the Atlantic and Indian Oceans because evidence for gene flow in the last 1.5 million years has yet to emerge. This study, by sampling localities adjacent to this barrier, demonstrates that recent gene flow has occurred from the Atlantic Ocean into the Indian Ocean via the Cape of Good Hope. We also found compelling genetic evidence that green turtles nesting at the rookeries of the South Mozambique Channel (SMC) and those nesting in the North Mozambique Channel (NMC) belong to separate genetic stocks. Furthermore, the SMC could be subdivided in two different genetic stocks, one in Europa and the other one in Juan de Nova. We suggest that this particular genetic pattern along the Mozambique Channel is attributable to a recent colonization from the Atlantic Ocean and is maintained by oceanic conditions in the northern and southern Mozambique Channel that influence early stages in the green turtle life cycle.
线粒体DNA（mtDNA）变异模式被用于分析印度洋西南部绿海龟（蠵龟）种群的群体遗传结构。对mtDNA控制区396 bp的序列变异分析显示，来自印度洋西南部10个筑巢地点的288只个体中有7种单倍型。这是首次在任何印度-太平洋筑巢种群中记录到大西洋单倍型。先前的研究表明，好望角是大西洋和印度洋之间的主要生物地理屏障，因为在过去150万年中尚未出现基因流动的证据。本研究通过对该屏障附近的地点进行采样，证明最近有基因流从大西洋经好望角流入印度洋。我们还发现了令人信服的遗传学证据，表明在莫桑比克海峡南部（SMC）筑巢的绿海龟和在莫桑比克海峡北部（NMC）筑巢的绿海龟属于不同的遗传种群。此外，SMC可细分为两个不同的遗传种群，一个在欧罗巴岛，另一个在新胡安岛。我们认为，莫桑比克海峡沿线这种特殊的遗传模式归因于最近从大西洋的殖民，并且是由莫桑比克海峡北部和南部影响绿海龟生命周期早期阶段的海洋条件所维持的。
