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首页> 外文期刊>Hydrobiologia >Using a phylogeographic approach to investigate the diversity and determine the distributional range of an isopod (Crustacea: Peracarida), Stenosoma nadejda (Rezig, 1989) in the Atlantic-Mediterranean region
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Using a phylogeographic approach to investigate the diversity and determine the distributional range of an isopod (Crustacea: Peracarida), Stenosoma nadejda (Rezig, 1989) in the Atlantic-Mediterranean region

机译：使用植物学方法研究大西洋-地中海地区等脚足纲动物（甲壳纲：Peracarida），纳氏天牛纲（Rezig，1989年）的多样性并确定其分布范围

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摘要

The genus Stenosoma comprises 13 species in the NE Atlantic, Mediterranean and Black Sea. Recent studies have improved knowledge on the distributional patterns of the genus, reducing species ranges and allowing the identification of cryptic species. Lacking a free-swimming life-stage, Stenosoma typically display small- to medium-sized ranges, with the exception of S. nadejda which occurs in the Atlantic-Mediterranean region. In this study, we build upon previous work and examine phylogeographic patterns of S. nadejda throughout its entire range to assess levels of genetic differentiation and evidence of cryptic species. While Elongation Factor 1 alpha gene sequences revealed an almost absence of genetic and geographic structure across the entire distribution of S. nadejda, the Cytochrome c oxidase subunit I gene sequences revealed a phylogenetic split defining two Mediterranean clades. Our results confirm the wide distribution of S. nadejda in the Atlantic/Mediterranean region and show that the distribution of the two Mediterranean clades does not match the east-west break in genetic continuity typically displayed by many species. This pattern is probably a consequence of sporadic long-distance dispersal by rafting. Conversely, an almost absence of shared haplotypes at the local level, conforms to the recognized poor ability of peracarids for autonomous dispersal.
机译：Stenosoma属包括东北大西洋，地中海和黑海的13种。最近的研究提高了有关属的分布方式的知识，减少了物种的范围，并允许鉴定隐性物种。由于没有自由游动的生命周期，因此，肉食蛾通常表现出中小型范围，除了大西洋地中海地区的纳德链球菌。在这项研究中，我们以先前的工作为基础，研究了纳德氏链球菌在其整个范围内的系统谱，以评估遗传分化水平和隐性物种的证据。尽管延伸因子1α基因序列揭示了整个Nadejda分布中几乎没有遗传和地理结构，但细胞色素C氧化酶亚基I基因序列揭示了系统发育分裂，定义了两个地中海进化枝。我们的结果证实了S. nadejda在大西洋/地中海地区的广泛分布，并表明两个地中海进化枝的分布与许多物种通常表现出的遗传连续性的东西向断裂不匹配。这种模式可能是漂流导致的零星长距离分散的结果。相反，在地方一级几乎没有共享的单倍型，这与公认的peracarids自主分散能力差有关。

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