Population genetic patterns revealed by microsatellite data challenge the mitochondrial DNA based taxonomy of Astyanax in Mexico (Characidae, Teleostei)
Population genetic patterns revealed by microsatellite data challenge the mitochondrial DNA based taxonomy of Astyanax in Mexico (Characidae, Teleostei)
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DOI：
10.1016/j.ympev.2011.03.009
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发表时间：
2011-07-01
影响因子：
4.1
通讯作者：
Strecker, Ulrike
中科院分区：
文献类型：
--
作者：
Hausdorf, Bernhard;Wilkens, Horst;Strecker, Ulrike
Astyanax已成为洞穴动物进化研究的重要模式系统。研究了微卫星数据显示的种群遗传模式与线粒体DNA序列显示的系统地理模式的相关性，以提高对这种新热带鱼在中北美的殖民历史的认识，并评估最近的分类分类。核基因型的分布与线粒体进化支的分布不一致。混合分析表明，在由不同线粒体分支定义的流行人群之间存在核基因流动。微卫星数据表明，洞穴种群从邻近种群中捕获了线粒体。此外，不同核基因型集群的居群之间也存在基因流动。这表明，核基因型集群和线粒体分支都不代表独立的进化单位，尽管线粒体差异很高，并且在不同鱼类的特征范围内。这一结论得到了形态中间形式存在的支持。我们的分析表明，跨墨西哥火山带限制了基因的流动，但已经被Astyanax穿越了几次。在尤卡坦半岛，没有明显的地理障碍，细胞核和线粒体标记物分布不一致；反映了由洪水或海侵引起的随机殖民事件，导致随机的系统地理断裂。因此，关于系统地理历史甚至物种划分的结论不应该基于单一的遗传标记。(C) 2011爱思唯尔公司版权所有。
Astyanax has become an important model system for evolutionary studies of cave animals. We investigated correlations of population genetic patterns revealed by microsatellite data and phylogeographic patterns shown by mitochondrial DNA sequences in Mexican cave and surface fish of the genus Astyanax (Characidae, Teleostei) to improve the understanding of the colonization history of this neotropical fish in Central and North America and to assess a recent taxonomic classification. The distribution of nuclear genotypes is not congruent with that of the mitochondrial clades. Admixture analyses suggest there has been nuclear gene flow between pop ulations defined by different mitochondrial clades. The microsatellite data indicate that there was mitochondrial capture of a cave population from adjacent: populations. Furthermore, gene flow also occurred between populations belonging to different nuclear genotypic clusters. This indicates that neither the nuclear genotypic clusters nor the mitochondrial clades represent independent evolutionary units, although the mitochondrial divergences are high and in a range usually characteristic for different fish species. This conclusion is supported by the presence of morphologically intermediate forms. Our analyses show that the Trans-Mexican Volcanic Belt limited gene flow, but has been crossed by Astyanax several times. In Yucatan, where obvious geographic barriers are missing, the incongruence between the distribution of nuclear and mitochondrial marker; reflects random colonization events caused by inundations or marine transgressions resulting in random phylogeographic breaks. Thus, conclusions about the phylogeographic history and even more about the delimitation of species should not be based on single genetic markers. (C) 2011 Elsevier Inc. All rights reserved.