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首页> 外文期刊>Marine biology >Sympatric size variants of the microcopepod Oncaea venusta exhibit distinct lineages in DNA sequences
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Sympatric size variants of the microcopepod Oncaea venusta exhibit distinct lineages in DNA sequences

机译：微足足纲Oncaea venusta的同胞大小变异体在DNA序列中显示出独特的谱系

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摘要

We investigated the phylogenetic relationships among different size groups of the pelagic microcopepod Oncaea venusta Philippi, 1843, by comparing the patterns of genetic variation of specimens collected at five locations of the Indo-West Pacific Ocean. Phylogenetic analyses were based on sequence data obtained from two DNA markers: A 310 bp fragment of the mitochondrial cytochrome b (cyt b) gene and a 480 bp fragment of the nuclear internal transcribed spacer 1 (ITS1). The cyt b sequences showed a much higher level of variation than those from ITS1, but the conclusion from both genes was concordant. Four genetic clades could be differentiated. A small- and a large-size group were unambiguously assigned to two distinct clades or lineages. Unexpectedly, the medium-sized individuals could be divided into another two different genetic clades. All four lineages were supported by high bootstrap values. The high levels of sequence divergence under sympatric conditions indicated that at least the two main groups, the large and the small one, may be assigned to different species. For the medium-size group additional morphological studies and more sensitive nuclear markers are required to clarify their taxonomic status.
机译：通过比较在印度洋-西太平洋五个地方收集的标本的遗传变异模式，我们调查了中上层微足动物Oncaea venusta Philippi，1843年不同大小群体之间的系统发生关系。系统发生分析基于从两个DNA标记获得的序列数据：线粒体细胞色素b（cyt b）基因的310 bp片段和核内转录间隔子1（ITS1）的480 bp片段。 cyt b序列显示出比ITS1更高的变异水平，但是两个基因的结论是一致的。可以区分四个遗传进化枝。大型和小型小组被明确分配给两个不同的进化枝或血统。出乎意料的是，中型个体可以分为另外两个不同的遗传进化枝。高引导值支持所有四个谱系。在同伴条件下的高水平序列差异表明，至少两个主要的群体，即大的和小的群体，可以被分配给不同的物种。对于中型组，需要进行其他形态学研究和更敏感的核标记，以阐明其分类学地位。

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