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Phylogeographical patterns of the gastropod Siphonaria pectinata (Linnaeus, 1758)

机译：腹足类动物Siphonaria pectinata的系统谱（Linnaeus，1758）

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摘要

Siphonaria pectinata is a marine gastropod distributed across the shores of the Western and Eastern Atlantic. Although previous studies have indicated that the species could be a recent introduction to Central and North America from Western Africa and Europe, other authors have questioned this statement. In fact, a recent study has shown that individuals from both sides of the Atlantic are genetically disconnected, rejecting the idea of a recent invasion. However, genetic information on this species is very scarce and based only on a single study using a limited number of specimens and sites. The data reported in the present study represent one step forward, collecting information from 119 specimens from 22 sites that cover the entire distributional range of the species. Populations from the Western Atlantic separated from eastern ones around 1.4−1.9 Mya, whereas the centre of dispersion is located on the eastern side of the Atlantic. Siphonaria pectinata should be considered native to the Western Atlantic and cannot be considered as a species with an amphi-atlantic distribution owing to the lack of genetic connection between both sides of the Atlantic, as previous authors have pointed out. The presence of a star-shaped phylogeny is discussed in the context of Plio-Pleistocene glaciations.
机译：南美白对虾（Siphonaria pectinata）是分布在西大西洋和​​东大西洋沿岸的一种海洋腹足动物。尽管先前的研究表明该物种可能是最近从西非和欧洲引入中美洲和北美洲的物种，但其他作者对此说法提出了质疑。实际上，最近的一项研究表明，大西洋两岸的人在基因上是脱节的，拒绝了最近入侵的想法。但是，有关该物种的遗传信息非常稀缺，仅基于一项使用有限数量的标本和位点的研究得出。本研究报告的数据代表了向前的一步，从22个覆盖整个物种分布范围的地点的119个标本中收集信息。来自西大西洋的人口在1.4-1.9 Mya左右与东部的人口分开，而分散中心位于大西洋的东部。正如先前的作者所指出的，由于南方大西洋两岸之间缺乏遗传联系，因此应将西洋槐（Siphonaria pectinata）视为原生于西大西洋，并且不能被视为具有两大西洋分布的物种。在上新世冰川期的背景下讨论了星状系统发育的存在。

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