Molecular phylogeny and evolution of the freshwater eels genus Anguilla based on the whole mitochondrial genome sequences
Molecular phylogeny and evolution of the freshwater eels genus Anguilla based on the whole mitochondrial genome sequences
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DOI：
10.1016/j.ympev.2004.09.003
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发表时间：
2005-01-01
影响因子：
4.1
通讯作者：
Tsukamoto, K
中科院分区：
文献类型：
--
作者：
Minegishi, Y;Aoyama, J;Tsukamoto, K
对安圭拉鳗鲡属18个种/亚种的线粒体全基因组序列进行了分子系统发育分析，以推测其系统发育关系，并对安圭拉鳗鲡属可能的传播途径进行了推测。利用线粒体DNA序列的15187个位点进行贝叶斯分析和最大似然分析表明，a . mossambica是鳗鲡最基础的物种，其他物种（除a . borneensis外）形成了三个地理分支：大西洋（2种）、大洋洲（3种）和印度-太平洋（1种）。目前的研究清楚地表明大西洋和大洋洲物种之间存在姐妹关系，这两个物种现在在地理分布上相距甚远。这表明，以往根据鳗鲡物种的地理分布来估计鳗鲡进入大西洋的传播路线的假设，不支持目前更完整的分析。另外，安圭拉属现今物种的独特地理分布似乎是由多次分散事件造成的。虽然根据硬骨鱼类的7.3 x 10（-4）个替换/位点/百万年的校准，鳗类鳗的物种形成开始的年龄初步估计为2000万年前，但由于这些鱼类的生态特征，这一分化时间可能被低估了。本文的研究结果表明，对安圭拉属的传播路线和分化时间的假设应该重新考虑。(C) 2004爱思唯尔公司版权所有。
Molecular phylogenetic analyses were conducted using the whole mitochondrial genome sequences of all 18 species/subspecies of the freshwater eels genus Anguilla to infer their phylogenetic relationships and to evaluate hypotheses about the possible dispersal routes of this genus. The Bayesian and maximum likelihood analyses using a total of 15,187 sites of mitochondrial DNA sequences suggested that A. mossambica was the most basal species of anguillid eel, and that the other species (except for A. borneensis) formed three geographic clades: Atlantic (two species), Oceania (three species), and Indo-Pacific (I I species). The present study clearly indicated a sister relationship between the Atlantic and Oceanian species, which now have distantly separated geographic distributions. This suggests that the previous hypotheses to estimate the dispersal route of anguillid eels into the Atlantic Ocean based on the current geographic distribution of species are unsupported by the present more complete analysis. Alternatively, the unique geographic distribution of the present day species in the genus Anguilla appears to have resulted from multiple dispersal events. Although the age of the beginning of speciation among anguillid eels was tentatively estimated as 20 million years ago using a calibration for bony fishes of 7.3 x 10(-4) substitutions/site/million years, it is possible that this divergence time was underestimated because of the ecological characteristics of these fishes. The results of the present study suggest that the hypotheses for the dispersal route and divergence time of the genus Anguilla should be reconsidered. (C) 2004 Elsevier Inc. All rights reserved.