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首页> 外文期刊>Journal of Experimental Marine Biology and Ecology >Hierarchical analyses of genetic variation of samples from breeding and feeding grounds confirm the genetic partitioning of northwest Atlantic and South Atlantic populations of swordfish (Xiphias gladius L.)
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Hierarchical analyses of genetic variation of samples from breeding and feeding grounds confirm the genetic partitioning of northwest Atlantic and South Atlantic populations of swordfish (Xiphias gladius L.)

机译：繁殖和取食地样品遗传变异的层次分析证实了剑鱼西北大西洋和南大西洋种群的遗传划分。

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摘要

In species with high migratory potential, the genetic signal revealing population differentiation is often obscured by population admixture. To our knowledge, the explicit comparison of genetic samples from known spawning and feeding areas has not been conducted for any highly migratory pelagic fish species. This study examines the geographic heterogeneity of swordfish mitochondrial DNA (mtDNA) lineages within the Atlantic Ocean using 330 base pairs of sequence of the control region from 480 individuals. Hierarchical analyses of sequence variation were conducted to test whether samples from areas identified as the corresponding spawning and feeding grounds for the northwest (NW) Atlantic (Caribbean and Georges Banks-US northeast) and the South Atlantic (Brazil-Uruguay and Gulf of Guinea), were more closely related to each other than to samples from any other region, including the Mediterranean Sea, the Indian Ocean, and the Pacific Ocean. Phylogeographic analyses reveal that swordfish mtDNA phylogeny is characterized by incomplete lineage sorting and secondary contact of two highly divergent clades. However, despite this complex phylogenetic signature, results from an analysis of nucleotide diversity and from an analysis of molecular variance (AMOVA) were for the most part concordant and indicate that NW Atlantic and South Atlantic swordfish belong to separate populations. The mtDNA distinctiveness of NW Atlantic and South Atlantic swordfish populations is indicative of philopatric behavior in swordfish towards breeding and feeding areas.
机译：在具有高迁徙潜力的物种中，揭示种群分化的遗传信号常常被种群混合所掩盖。据我们所知，尚未对任何高度迁徙的远洋鱼类进行显式比较来自已知产卵区和取食区的遗传样品。这项研究使用来自480个个体的330个碱基对的控制区序列，检查了大西洋中箭鱼线粒体DNA（mtDNA）谱系的地理异质性。进行了序列变异的分层分析，以测试来自西北（NW）大西洋（加勒比和乔治·班克斯-美国东北）和南大西洋（巴西-乌拉圭和几内亚湾）的产卵场和觅食场的样本是否被确定与其他区域（包括地中海，印度洋和太平洋）的样本相比，彼此之间的关系更为密切。植谱分析表明，箭鱼mtDNA的系统发育特征是谱系分选不完全，以及两个高度分歧的进化枝的二次接触。但是，尽管具有复杂的系统发育特征，但核苷酸多样性分析和分子变异分析（AMOVA）的结果在大多数情况下是一致的，并表明西北大西洋和南大西洋箭鱼属于不同的种群。 NW大西洋和南大西洋箭鱼种群的mtDNA独特性表明箭鱼朝向繁殖和觅食区域的行为表现。

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