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首页> 外文期刊>Polar biology >Analyzing drivers of speciation in the Southern Ocean using the sea spider species complex Colossendeis megalonyx as a test case
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Analyzing drivers of speciation in the Southern Ocean using the sea spider species complex Colossendeis megalonyx as a test case

机译：利用海蜘蛛物种复杂巨型巨型巨大巨型南海海洋司机的分析为试验箱

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摘要

Colossendeis megalonyx Hoek, 1881 has the broadest distribution of all sea spiders in the Southern Ocean. Previous studies have detected several evolutionarily young lineages within this taxon and interpreted them as a result of allopatric speciation in a few shelf refuges during glacial maxima. However, alternative scenarios such as ecological speciation in sympatry have rarely been considered or tested. Here, we generated the most extensive genomic and morphometric data set on the C. megalonyx species complex to (i) comprehensively describe species diversity, (ii) explore intraspecific connectivity between populations located around Antarctica, and (iii) systematically test for positive selection indicative of adaptive speciation. We successfully applied a target hybrid enrichment approach and recovered all 1607 genes targeted. Phylogenomic analysis was consistent with previous findings and, moreover, increased the resolution of branching within lineages. We found specimens of phylogenetically well-separated lineages occurring in sympatry to be genetically distinct from each other and gene flow between geographically separated populations of the same lineages to be restricted. Evidence for positive selection was found for four genes associated with structural and neuronal functions. Hence, there is an indication for positive selection in the C. megalonyx species complex, yet its specific contribution to the speciation process remains to be explored further. Finally, morphometric analyses revealed multiple significant differences between lineages, but a clear separation proved difficult. Our study highlights the relevance of positive selection as a potential driver for speciation in the Southern Ocean.
机译：Colossendeis Megalonyx Hoek，1881年，在南方海洋中的所有海蜘蛛都有广泛的分布。以前的研究在这个分类群中发现了几种进化的年轻谱系，并在冰川最大值期间的几个货架避难所的各种货物形态来解释它们。但是，诸如Sympatry的生态形态等替代方案很少被考虑或测试。在这里，我们在C. Megalonyx物种复合物上设定了最广泛的基因组和形态学数据，以全面描述物种多样性，（ii）探讨位于南极洲周围的人群之间的内部连接性，（iii）系统地测试正面选择自适应形态。我们成功地应用了目标混合浓缩方法，并恢复了目标的所有1607个基因。文学组织分析与先前的发现一致，而且，增加了谱系内分支的分辨率。我们发现在Sympatry中发生的系统良好分离的分离谱系的标本，以彼此逐种不同，并且在地理分离的相同谱系的地理分离群之间的基因流动被限制。发现与结构和神经元功能相关的四种基因发现阳性选择的证据。因此，在C.巨龙种类复合物中存在阳性选择，但其对物种过程的具体贡献仍有待进一步探讨。最后，形态学分析显示谱系之间的多重显着差异，但难以分离难以。我们的研究突出了积极选择作为南洋南海的潜在驾驶员的相关性。

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  • 来源
    《Polar biology》 |2020年第4期|319-342|共24页
  • 作者

    Doemel Jana S.; Dietz Lars; Macher Till-Hendrik; Rozenberg Andrey; Mayer Christoph; Spaak Johanna M.; Melzer Roland R.; Leese Florian;

  • 作者单位

    Univ Duisburg Essen Fac Biol Aquat Ecosyst Res Univ Str 5 D-45141 Essen Germany;

    Zool Res Museum Alexander Koenig Stat Phylogenet & Phylogen Adenauerallee 160 D-53113 Bonn Germany|Univ Bonn Fac Math & Nat Sci D-53012 Bonn Germany;

    Univ Duisburg Essen Fac Biol Aquat Ecosyst Res Univ Str 5 D-45141 Essen Germany;

    Technion Israel Inst Technol Fac Biol IL-3200003 Haifa Israel;

    Zool Res Museum Alexander Koenig Stat Phylogenet & Phylogen Adenauerallee 160 D-53113 Bonn Germany|Univ Bonn Fac Math & Nat Sci D-53012 Bonn Germany;

    Univ Waikato Sch Sci Biol Sci Hamilton 3216 New Zealand;

    SNSB Bavarian State Collect Zool Muenchhausenstr 21 D-81247 Munich Germany|Ludwig Maximilians Univ Munchen Dept Biol 2 Grosshaderner Str 2 Planegg Martinsried Germany|Ludwig Maximilians Univ Munchen GeoBioCtr Richard Wagner Str 10 D-80333 Munich Germany;

    Univ Duisburg Essen Fac Biol Aquat Ecosyst Res Univ Str 5 D-45141 Essen Germany|Univ Duisburg Essen Ctr Water & Environm Res ZWU Univ Str 2 D-45141 Essen Germany;

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  • 正文语种 eng
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  • 关键词

    Antarctic benthos; Target hybrid enrichment; Positive selection; Integrative taxonomy; Cryptic species;

    机译：南极Benthos;目标杂交浓缩;正面选择;综合分类;神秘的物种;

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