The leatherback sea turtle (Dermochelys coriacea) population that nests in Brazil is restricted to a few individuals, but high densities of pelagic individuals are observed along the southern and southeastern Brazilian coast. We investigated the diversity of the mitochondrial DNA (mtDNA) control region in order to understand the relationship between nesting and pelagic leatherbacks from Brazil and elsewhere. High-quality 711-bp sequences were generated, analyzed, and compared with published data from worldwide populations. We detected the presence of shared haplotypes between nesting and pelagic aggregates from Brazil, as well as haplotypes shared with other nesting areas from the Atlantic and Pacific. Furthermore, the use of longer control region sequences allowed the subdivision of the common Atlantic haplotype A into 3 different haplotypes (A1, A3, and A4), thus improving the resolution of mtDNA-based leatherback phylogeography. The use of longer sequences partially supported a closer association between nesting and pelagic individuals from Brazil and pointed to a complex origin for the pelagic individuals in the Brazilian coast.

译文

:在巴西筑巢的棱皮海龟(Dermochelys coriacea)种群仅限于少数个体,但是在巴西南部和东南部沿海观察到高密度的浮游鱼类。我们研究了线粒体DNA(mtDNA)控制区的多样性,以了解来自巴西和其他地方的筑巢和中上皮棱皮动物之间的关系。生成,分析了高质量的711-bp序列,并将其与来自全球人群的已发布数据进行了比较。我们检测到来自巴西的巢穴和中上层骨料之间存在共享的单体型,以及与来自大西洋和太平洋的其他巢穴区域共享的单体型。此外,使用更长的控制区序列可以将常见的大西洋单倍型A细分为3种不同的单倍型(A1,A3和A4),从而提高了基于mtDNA的棱皮植物系统学的分辨率。较长序列的使用部分地支持了来自巴西的中上层个体与筑巢个体之间的紧密联系,并指出了巴西海岸中上层个体的复杂起源。

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