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首页> 外文期刊>Molecular phylogenetics and evolution >Global mitochondrial DNA phylogeography and biogeographic history of the antitropically and longitudinally disjunct marine bryozoan Membranipora membranacea L. (Cheilostomata): Another cryptic marine sibling species complex?
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Global mitochondrial DNA phylogeography and biogeographic history of the antitropically and longitudinally disjunct marine bryozoan Membranipora membranacea L. (Cheilostomata): Another cryptic marine sibling species complex?

机译：反向和纵向分离的海洋苔藓动物Membranipora membranacea L.（Cheilostomata）的全球线粒体DNA系谱和生物地理史：另一种神秘的海洋同胞物种复合体？

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摘要

The origin of disjunct distributions in high dispersal marine taxa remains an important evolutionary question as it relates to the formation of new species in an environment where barriers to gene flow are not always obvious. To reconstruct the relationships and phylogeographic history of the antitropically and longitudinally disjunct bryozoan Membranipora membranacea populations were surveyed with mtDNA cytochrome oxidase 1 (COI) sequences across its cosmopolitan range. Maximum parsimony, maximum likelihood and Bayesian genealogies revealed three deep clades in the North Pacific and one monophyletic clade each in the southeast Pacific (Chile), southwest Pacific (Australia/New Zealand), North Atlantic and southeast Atlantic (South Africa). Human-mediated dispersal has not impacted M. membranacea's large-scale genetic structure. M. membranacea did not participate in the trans-arctic interchange. Episodic long-distance dispersal, combined with climatic vicariance can explain the disjunct distribution. Dispersal led southward across the tropics perhaps 13 mya in the East Pacific and again northwards perhaps 6 mya in the Eastern Atlantic to colonize the North Atlantic from the South, and along the West Wind Drift to colonize Australia. The clades differentiated over evolutionary time in their respective ocean region, potentially forming a sibling species complex. The taxonomic status of the clades is discussed. (C) 2008 Elsevier Inc. All rights reserved.
机译：高分散海洋生物分类中分离分布的起源仍然是一个重要的进化问题，因为它涉及在基因流障碍并不总是很明显的环境中新物种的形成。为了重建亲缘关系和纵向分离的苔藓Membranipora membranacea种群的关系和系统地理史，使用了跨大都会范围的mtDNA细胞色素氧化酶1（COI）序列进行了调查。最大简约度，最大似然和贝叶斯谱系揭示了北太平洋三个深部进化枝，东南太平洋（智利），西南太平洋（澳大利亚/新西兰），北大西洋和东南大西洋（南非）各有一个单系进化枝。人类介导的扩散并没有影响膜分枝杆菌的大规模遗传结构。 M. membranacea没有参加跨北极的交流。情景上的长距离分散，再加上气候变化可以解释分离分布。分散带向南穿越热带，在东太平洋地区可能达13米亚，然后又向北穿越东大西洋，可能达6米亚，从而从南方殖民北大西洋，并沿着西风漂移殖民澳大利亚。进化枝在其各自的海洋区域中随着演化时间而分化，可能形成同胞物种复合体。讨论了进化枝的分类学地位。 （C）2008 Elsevier Inc.保留所有权利。

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