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首页> 外文期刊>Marine biology >Molecular phylogeny and evolution of the pelagic copepod genus Neocalanus (Crustacea: Copepoda)
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Molecular phylogeny and evolution of the pelagic copepod genus Neocalanus (Crustacea: Copepoda)

机译：上层co足类新足类的分子系统发育和进化（甲壳纲：Co足类）

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摘要

Portions of the mitochondrial genome (ca. 4 kb), encoding three protein-coding (COI, ND4L, ND6) and two ribosomal RNA (srRNA, lrRNA) genes, were sequenced for all six currently recognized species, plus one form, of the pelagic calanoid copepod genus Neocalanus. In Neocalanus gracilis, the ND6 gene was not found in the sequenced portion of the mitochondrial genome. Unambiguously aligned sequences were subjected to Bayesian, maximum-likelihood, maximum-parsimony, and neighbor-joining analyses using Eucalanus bungii as an outgroup. The resultant tree topologies from these four methods were congruent, robust, and all nodes were supported by high bootstrap values and posterior probabilities of 92-100%. Two tropical and subtropical species (N. gracilis and N. robustior) occupied the most basal position, and a subantarctic (N. tonsus) and three subarctic Pacific species (N. cristatus, N. plumchrus, and N. flemingeri) diverged subsequently. Transequatorial dispersal of the ancestral population during glaciations is suggested for this pattern of speci-ation, in which sister clades exhibited antitropical distributions. Although the area of ocean is much broader in the subantarctic than the subarctic Pacific, a higher number of species occur in the subarctic Pacific (three) than the subantarctic (one). The possibility that marginal seas, such as Japan Sea and Okhotsk Sea, function as natal areas for the divergence of species is discussed.
机译：线粒体基因组的部分（约4 kb）编码了三个蛋白质编码（COI，ND4L，ND6）和两个核糖体RNA（srRNA，lrRNA）基因，对所有这六个目前公认的物种（加上一种形式）进行了测序。中上层颅骨co足类新Neo。在新Neo蒲中，在线粒体基因组的测序部分未发现ND6基因。明确对齐的序列进行了贝叶斯，最大似然，最大简约和邻居加入分析，使用桉木作为分组。这四种方法所生成的树拓扑是一致的，健壮的，并且所有节点都由高自举值和92-100％的后验概率支持。随后，两个热带和亚热带物种（N. gracilis和鲁棒猪笼草）占据了最基本的位置，而一个亚南极（N.tonus）和北极北极亚种（N. cristatus，N。plumchrus和N. flemingeri）分叉。对于这种规范化模式，建议了冰川期祖先种群的越赤道扩散，其中姊妹进化枝表现出相反的分布。尽管南极洲的海洋区域比北极地区的太平洋要广得多，但是北极地区的太平洋（三个）中的物种比南极洲的（一种）要多。讨论了诸如日本海和鄂霍次克海之类的边缘海可能作为物种扩散的产地的可能性。

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