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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Genetic structure of olive ridley sea turtles (Lepidochelys olivacea) in Ghana, West Africa
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Genetic structure of olive ridley sea turtles (Lepidochelys olivacea) in Ghana, West Africa

机译：橄榄色河口海龟（Lepidochelys Olivacea）的遗传结构在加纳，西非

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Sea turtles migrate across ocean basins to reach foraging and breeding areas but still exhibit significant population structure across nesting beaches. Although five species of sea turtles nest in West Africa, the genetic structure of many species in this region has not been adequately explored. We investigated the diversity of mitochondrial and nuclear DNA for nesting olive ridley (Lepidochelys olivacea) turtles in two coastal communities (Mankoadze and Ada Foah) in Ghana that are approximately 160 km apart. Samples were collected during four nesting seasons: 2006, 2014, 2015 and 2016. Analysis of the control region of mtDNA (n = 45) revealed six variable positions defining five haplotypes, of which one was previously undescribed (Lo91). These findings are indicative of population expansion from a small ancestral population and support the scenario of colonization of the Atlantic via founder effect. Eleven microsatellite loci were used to analyze two years (2015 and 2016) from Mankoadze. We determined these nesting cohorts were not genetically distinct (F-ST = 0.025, P = 0.286) and can therefore be considered a single population. This population was compared to six females from Ada Foah across seven loci. Individuals from the two locations were less related than expected under a model of random chance, and showed signs of outbreeding, and reflected moderate variation between the two (F-IS = -0.160, P = 1.00; F-ST = 0.104, P = 0.002). The structuring between locations indicate nesting individuals may utilize different migration mutes, foraging grounds, or breeding grounds and that Ghana may serve as a transitional area between central and west African rookeries.
机译：海龟在海洋盆地迁移，以达到觅食和繁殖区域，但仍然在嵌套海滩上表现出显着的人口结构。虽然西非的五种海龟巢，但该地区许多物种的遗传结构尚未得到充分探索。我们调查了在加纳的两个沿海社区（Mankoadze和Ada Foah）中嵌套橄榄渣（LepidoChely Olivacea）乌龟的线粒体和核DNA的多样性。在四个嵌套季节中收集样品：2006,2014,2015和2016. MTDNA（n = 45）的对照区域的分析揭示了定义五个单倍型的六个可变位置，其中预先是未思索的（LO91）。这些发现表明，来自小型祖先人口的人口扩张，并通过创始人效应支持大西洋的殖民化情景。来自Mankoadze的十一型微卫星基因座用于分析两年（2015年和2016年）。我们确定这些嵌套队列没有转基因不同的（F-ST = 0.025，P = 0.286），因此可以被认为是单一的人口。将该人群与来自七个基因座的ADA FOAH的六个女性进行比较。在随机机会模型下，两个地点的个人少于预期，并且显示出交错的迹象，两者之间的反射中等变化（f-in = -0.160，p = 1.00; f-st = 0.104，p = 0.002）。位置之间的结构化表明嵌套个体可以利用不同的迁移静脉，觅食地，或繁殖地，并且加纳可以作为中非新的新手之间的过渡区域。

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