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首页> 外文期刊>Zoological Science >Phylogeography of white-spotted charr (Salvelinus leucomaenis) inferred from mitochondrial DNA sequences
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Phylogeography of white-spotted charr (Salvelinus leucomaenis) inferred from mitochondrial DNA sequences

机译：从线粒体DNA序列推断出白点炭疽（Salvelinus leucomaenis）的系统记录

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摘要

The white-spotted charr (Salvelinus leucomaenis) is a coldwater-adapted fish distributed in far-eastern Asia. To assess phylogeographic patterns of this species over most of its range in the Japanese archipelago and Sakhalin Island, Russia, we examined nucleotide sequences of the mitochondrial DNA (mtDNA) cytochrome b region (557 bp) in 141 individuals from 50 populations. A total of 33 (5.5%) nucleotide positions were polymorphic and defined 29 haplotypes. Phylogenetic analysis assigned the observed haplotypes to four main clades, which were characterized by the idiosyncrasies and discontinuity of geographic distributions. The nested clade analyses revealed that the geographical distribution patterns of some haplotypes and clades were explained by historical event such as past fragmentation. Although substantial genetic differentiation was found among the four main clades, their geographic distributions overlapped extensively in several regions. Since white-spotted charr can potentially use both freshwater and marine environments, coexistence among different lineages can be attributed to secondary contact through range expansion by migratory individuals during multiple glacial periods after interglacial isolation. Finally, our data demonstrate that the current subspecies designation does not reflect the phylogeography of this species based on mtDNA analysis. Hierarchical analysis (AMOVA) also showed that genetic variation was far more pronounced within subspecies than among subspecies (i.e., among discrete regions). These results suggest that each population, rather than each subspecies, must be treated as an evolutionarily significant unit.
机译：白点黑鲑（Salvelinus leucomaenis）是一种适应冷水的鱼类，分布在远东亚洲。为了评估该物种在日本群岛和俄罗斯萨哈林岛的大部分范围内的植物地理特征，我们在50个种群的141个个体中检查了线粒体DNA（mtDNA）细胞色素b区（557 bp）的核苷酸序列。共有33个（5.5％）核苷酸位置具有多态性，并定义了29个单倍型。系统发育分析将观察到的单倍型分配给四个主要进化枝，其特征是地理分布的特质和不连续性。巢式进化枝分析表明，某些单倍型和进化枝的地理分布模式是由历史事件（例如过去的碎片化）解释的。尽管在四个主要进化枝之间发现了显着的遗传分化，但它们的地理分布在几个区域广泛重叠。由于白点鲑鱼有可能在淡水和海洋环境中使用，因此不同世系之间的共存可归因于在冰川间隔离后的多个冰川时期中，迁徙者通过范围扩大而形成的二次接触。最后，我们的数据表明，根据mtDNA分析，当前的亚种名称不能反映该物种的系统地理。层次分析（AMOVA）还显示，亚种内的遗传变异远比亚种间（即离散区域间）更为明显。这些结果表明，必须将每个种群而不是每个亚种视为一个进化上重要的单位。

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