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首页> 外文期刊>Marine biology >Deconstructing an assemblage of 'turtle' barnacles: species assignments and fickle fidelity in Chelonibia
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Deconstructing an assemblage of 'turtle' barnacles: species assignments and fickle fidelity in Chelonibia

机译：解构“乌龟”藤壶组合：Chelonibia中的物种分配和善变的忠诚

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Barnacles in the genus Chelonibia are commensal with a variety of motile marine animals including sea turtles, crustaceans, and sirenians. We conducted a worldwide molecular phylogenetic survey of Chelonibia collected from nearly all known hosts to assess species relationships, host-fidelity, and phylogeographic structure. Using DNA sequences from a protein-coding mitochon-drial gene (COI), a mitochondrial rRNA gene (12S), and one nuclear rRNA gene (28S), we found that of four species, three (C. testudinaria, C. patula, and C. manati) are genetically indistinguishable. In addition, we show each utilizes a rare androdioecious mode of reproduction involving complemental males. In contrast, the fourth species (C. caretta), which is hermaphroditic and specializes on turtles, is genetically distinct-leading to the conclusion that the three former taxa are morphotypes of the same species and should be synonymized under C. testudinaria. Phylogenetic analysis resulted in three geographic clades (Atlantic, Indian Ocean/western Pacific, and eastern Pacific) with haplotype parsimony networks revealing no shared hap-lotypes among geographic regions. Analysis of molecular variance detected significant differences among sequences by region (p ＜ 0.005); conversely, there were no significant differences among sequences when grouped by host or taxonomic designation. Average pairwise genetic distances were lower between the eastern Pacific and Atlantic clades (0.053 ± 0.006) than between the eastern Pacific and Indian Ocean/western Pacific clades (0.073 ± 0.008), suggesting Atlantic and eastern Pacific populations were connected more recently, perhaps until the rise of the Isthmus of Panama. Host use by Chelonibia morphotypes is discussed along with speculation on possible ancestral hosts and support for a "turtle-first" hypothesis.
机译：Chelonibia属的藤壶与包括海龟，甲壳类动物和海妖类在内的多种活动性海洋动物相称。我们对从几乎所有已知寄主收集的白粉病进行了全球分子系统发育调查，以评估物种之间的关系，寄主保真度和系统地理结构。使用来自蛋白质编码线粒体干燥基因（COI），线粒体rRNA基因（12S）和一个核rRNA基因（28S）的DNA序列，我们发现了四个物种，其中三个（C. testudinaria，C. patula，和C. manati）在遗传上是无法区分的。此外，我们显示了每种都利用一种罕见的雄雄生殖繁殖方式，涉及互补的雄性。相比之下，第四种（C. caretta）是雌雄同体的，专门研究乌龟，在遗传上截然不同，从而得出以下结论：前三个分类群是同一物种的形态型，应该在C. testudinaria下成为同义词。系统发育分析得出三个地理进化枝（大西洋，印度洋/西太平洋和东太平洋），其单倍型简约网络揭示了地理区域之间没有共享的单倍型。分子方差分析检测到区域之间序列之间存在显着差异（p ＜0.005）；相反，按宿主或分类学名称分组时，序列之间无显着差异。东太平洋和大西洋进化枝之间的平均成对遗传距离（0.053±0.006）比东太平洋和印度洋/西太平洋进化枝之间的平均成对遗传距离（0.073±0.008）低，这表明大西洋和东太平洋种群之间的联系最近，也许直到巴拿马地峡的崛起。讨论了Chelonibia形态型对宿主的使用，以及对可能的祖先宿主的推测以及对“乌龟优先”假说的支持。

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  • 来源
    《Marine biology》 |2014年第1期|45-59|共15页
  • 作者

    John D. Zardus; David T. Lake; Michael G. Frick; Paul D. Rawson;

  • 作者单位

    Department of Biology, The Citadel, 171 Moultrie Street,Charleston, SC 29407, USA;

    Department of Biology, The Citadel, 171 Moultrie Street,Charleston, SC 29407, USA,University of South Carolina School of Medicine,6439 Garners Ferry Rd, Columbia,SC 29208, USA;

    Archie Carr Center for Sea Turtle Research, Department of Biology, University of Florida, Gainesville, FL 32611, USA;

    School of Marine Sciences, University of Maine,5751 Murray Hall, Orono, ME 04469, USA;

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