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首页> 外文期刊>Marine biology >Molecular phylogeny of obligate fish parasites of the family Cymothoidae (Isopoda, Crustacea): evolution of the attachment mode to host fish and the habitat shift from saline water to freshwater
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Molecular phylogeny of obligate fish parasites of the family Cymothoidae (Isopoda, Crustacea): evolution of the attachment mode to host fish and the habitat shift from saline water to freshwater

机译：葫芦科（Isopoda，甲壳纲）专性鱼类寄生虫的分子系统发育：寄主鱼的附着方式的演变和栖息地从盐水到淡水的转变

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In host-parasite coevolution, parasite innovations including the acquisition of new habitats and novel traits can trigger evolutionary breakthroughs and enhance parasite diversification via accumulation of new hosts. All species of the family Cymothoidae are obligate fish parasites, attaching to exterior body surfaces of fish, the buccal or opercular cavities, or burrowing into abdominal muscle tissue. In the present study, we constructed a molecular phylogeny of 27 cymothoid species that parasitise 38 fish species, combined with 2 prior cymothoid datasets, based on the sequences of mitochondrial 16S rRNA and COI genes. We explored the evolution of the host attachment mode, and the habitat shift from saline water to freshwater. Our evolutionary trees include two freshwater clades, an abdominal burrower clade, and cymothoid clades that are closer to the base of Cymothoidae than those initially analysed. We found that the basal clade of Cymothoidae was Elthusa sacciger, which is parasitic in the opercular cavity of synaphobranchid eels. This result suggests that cymothoids may have originated in deep seas, subsequently expanded to shallow seas, and then to brackish and/or freshwater, by shifting host species. Invasion of freshwater habitats has occurred at least twice; freshwater abdominal muscle burrowers living on armoured catfish constitute a clade allied to E. sacciger. The ancestral host attachment site, based on our dataset, was the opercular cavity, followed (sequentially) by buccal colonisation and attachment to the external body.
机译：在寄主－寄生虫的共同进化中，包括获得新的栖息地和新颖性状在内的寄生虫创新可引发进化突破，并通过积累新寄主而增强寄生虫的多样性。 Cy科的所有物种均为专性鱼类寄生虫，附着于鱼类的外表，颊颊或腹腔，或钻入腹肌组织。在本研究中，我们基于线粒体16S rRNA和COI基因的序列，构建了寄生于38种鱼类的27种拟蝶类物种的分子系统发育，并结合了2种先前的拟蝶类数据集。我们探索了宿主依附模式的演变，以及栖息地从盐水转移到淡水的过程。我们的进化树包括两个淡水进化枝，一个腹地洞穴进化枝和一个环状拟卵进化枝，它们比最初分析的更接近于食蛾科的基部。我们发现，食蟹科的基部进化枝是Elthusa sacciger，它寄生在突触性鳗鱼的腹腔中。该结果表明，通过移动寄主物种，类ym骨类可能起源于深海，随后扩展至浅海，然后扩展至微咸水和/或淡水。淡水生境的入侵至少发生了两次；生活在装甲cat鱼上的淡水腹肌穴居人构成了与E. Sacciger结盟的进化枝。根据我们的数据集，祖先的宿主附着位点是腹腔，其次是颊部定植并附着在体外。

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  • 来源
    《Marine biology》 |2017年第5期|105.1-105.15|共15页
  • 作者

    Hata Hiroki; Sogabe Atsushi; Tada Shinya; Nishimoto Ryohei; Nakano Reina; Kohya Nobuhiko; Takeshima Hirohiko; Kawanishi Ryota;

  • 作者单位

    Ehime Univ, Grad Sch Sci & Engn, 2-5 Bunkyo, Matsuyama, Ehime 7908577, Japan;

    Hirosaki Univ, Fac Agr & Life Sci, Dept Biol, I-1 Bunkyo, Hirosaki, Aomori 0368560, Japan;

    Ehime Univ, Grad Sch Sci & Engn, 2-5 Bunkyo, Matsuyama, Ehime 7908577, Japan;

    Ehime Univ, Dept Biol, Fac Sci, 2-5 Bunkyo, Matsuyama, Ehime 7908577, Japan;

    Ehime Univ, Dept Biol, Fac Sci, 2-5 Bunkyo, Matsuyama, Ehime 7908577, Japan;

    Ehime Univ, Dept Biol, Fac Sci, 2-5 Bunkyo, Matsuyama, Ehime 7908577, Japan;

    Res Inst Humanity & Nat, Kita Ku, 457-4 Motoyama, Kyoto 6038047, Japan;

    Hokkaido Univ, Fac Environm Earth Sci, Kita Ku, N10W5, Sapporo, Hokkaido 0600810, Japan;

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