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Lack of population genetic structure in the marine nematodes Ptycholaimellus pandispiculatus and Terschellingia longicaudata in beaches of the Persian Gulf, Iran

机译:伊朗波斯湾海滩海洋线虫Ptycholaimellus pandispiculatus和Terschellingia longicaudata种群遗传结构的缺乏

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摘要

We investigated genetic diversity and population genetic structure of two common benthic nematode species, Ptycholaimellus pandispiculatus and Terschellingia longicaudata, from sandy beaches in the area of Bandar Abbas (Iran), Persian Gulf. Based upon partial mitochondrial cytochrome oxidase c subunit 1 (COI) gene data, 17 and two haplotypes were found for P.pandispiculatus and Te.longicaudata, respectively. Analysis of molecular variance did not reveal a significant population genetic structure for either species. The absence of genetic structuring indicates substantial dispersal and gene flow in our study area. To assess the species structure of Te.longicaudata at a larger geographic scale, we compared 18S rDNA and COI sequences from Iran and the Scheldt Estuary in The Netherlands to ascertain whether they truly belong to the same species. Our data confirmed previous studies that Te.longicaudata likely constitutes a complex of multiple cryptic species, with one of these species having a (near) cosmopolitan distribution.
机译:我们调查了波斯湾阿巴斯港(伊朗)地区沙滩上两种常见底栖线虫物种Ptycholaimellus pandispiculatus和Terschellingia longicaudata的遗传多样性和种群遗传结构。根据部分线粒体细胞色素氧化酶c亚基1(COI)基因数据,分别发现P.pandispiculatus和Te.longicaudata的17和两个单倍型。分子变异分析没有显示出两个物种的重要种群遗传结构。基因结构的缺乏表明我们研究领域的大量分散和基因流动。为了在更大的地理范围内评估Te.longicaudata的物种结构,我们比较了来自伊朗和荷兰Scheldt河口的18S rDNA和COI序列,以确定它们是否真正属于同一物种。我们的数据证实了先前的研究,即Te.longicaudata可能构成了多个神秘物种的复合体,其中一个物种具有(近)世界性分布。

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