The evolutionary history and global phylogeography of the green turtle (Chelonia mydas)
The evolutionary history and global phylogeography of the green turtle (Chelonia mydas)
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DOI：
10.1111/jbi.13483
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发表时间：
2019-05-01
影响因子：
3.9
通讯作者：
Dutton, Peter H.
中科院分区：
文献类型：
--
作者：
Jensen, Michael P.;FitzSimmons, Nancy N.;Dutton, Peter H.
目的：研究濒危绿色海龟Chelonia mydas的遗传结构和全球生态地理，根据过去的气候事件和当前的保护需求。位置：世界各地的热带和亚热带海滩。方法：我们分析了来自全球127个rookeries的4，878个个体筑巢绿色海龟样本的线粒体（mt）DNA控制区的386个碱基对。我们使用地理分析，以评估人口的历史，分散和障碍，基因流导致了目前的分布mtDNA lineage.Results：我们确定了11个不同的血统，与特定的地理区域。系统发育分析揭示了以印度太平洋为中心的物种的古老起源，以及中/东太平洋和大西洋盆地最近的殖民化。总的来说，海洋地理结构是强大的，但有一个明确的模式，区域之间的连接栖息地。大的遗传分离被发现在有明显的障碍扩散，如大西洋和太平洋之间和跨太平洋，以及不太明显的障碍扩散。混合物的mtDNA单倍型谱系被检测到在纬度的极端横跨印度洋和西太平洋，导致这些地区的核苷酸多样性热点。西南太平洋、西北太平洋、西南印度洋和西北印度洋的区域遗传多样性和地方性丰富度最高。主要结论：过去的气候波动极大地影响了高度洄游绿色海龟遗传多样性的分布。我们的数据表明，过去的气候事件以不同的方式影响当地人口和物种似乎已经在多个冰川避难所的最后一次冰川生存。
Aim: To examine the genetic structure and global phylogeography of the endangered green sea turtle, Chelonia mydas, in light of past climatic events and current conservation needs.Location: Tropical and subtropical beaches around the world.Methods: We analysed 386 base pairs of the mitochondrial (mt) DNA control region of 4,878 individual nesting green turtle samples from 127 rookeries globally. We used phylogeographic analysis to assess how demographic history, dispersal and barriers to gene flow have led to the current distribution of mtDNA lineages.Results: We identified 11 divergent lineages that were tied to specific biogeographical regions. The phylogenetic analyses revealed an ancient origin for the species centred in the Indo-Pacific and more recent colonization of the Central/Eastern Pacific as well as the Atlantic Basin. Overall the phylogeographic structure was strong but with a clear pattern of regional connectivity among rookeries. A Large genetic separation was found where there were obvious barriers to dispersal such as between the Atlantic and Pacific oceans and across the Pacific Ocean, as well as less obvious barriers to dispersal. Admixture of mtDNA haplotype lineages was detected at latitudinal extremes across the Indian Ocean and western Pacific Ocean resulting in these areas being nucleotide diversity hotspots. The highest regional genetic diversity and high endemic richness was observed in the SW Pacific, NW Pacific, SW Indian and NW Indian oceans.Main conclusions: Past climatic fluctuations greatly affected the distribution of genetic diversity in the highly migratory green turtle. Our data suggest that past climatic events influenced local populations in different ways and the species appears to have survived the last glaciations in multiple glacial refugia.