Origin of the two major distinct mtDNA clades of the Japanese population of the oriental weather loach Misgurnus anguillicaudatus (Teleostei: Cobitidae)
Origin of the two major distinct mtDNA clades of the Japanese population of the oriental weather loach Misgurnus anguillicaudatus (Teleostei: Cobitidae)
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DOI：
10.25225/fozo.v60.i4.a12.2011
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发表时间：
2011-12
期刊：
影响因子：
--
通讯作者：
T. Kitagawa;Y. Fujii;N. Koizumi
中科院分区：
文献类型：
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作者：
T. Kitagawa;Y. Fujii;N. Koizumi
摘要。东方天气泥鳅（泥鳅科：泥鳅科）生活在包括日本群岛在内的东亚水域。日本鳗鲡种群包括两个主要的线粒体DNA （mtDNA）分支，但它们的进化起源尚不清楚。在这项研究中，我们基于mtDNA细胞色素b序列对鳗鲡进行了系统地理学分析，以阐明两个不同mtDNA分支的进化起源。这些新获得的数据与先前研究中获得的mtDNA序列数据整合并重新分析。结果表明，其中一个主要进化支起源于一种泥鳅属泥鳅的mtDNA渗入。携带非渐渗mtDNA的种群的地理分布范围往往局限于日本列岛的外围地区，而携带渐渗mtDNA的种群的分布范围则遍布日本列岛的广大地区。这些分布和分化模式表明，携带渐异mtDNA的鳗鲡种群已经扩散并取代了携带非渐异mtDNA的鳗鲡种群。
Abstract. The oriental weather loach Misgurnus anguillicaudatus (Teleostei: Cobitidae) inhabits the waters of East Asia including Japanese Islands. The Japanese population of M. anguillicaudatus includes two major mitochondrial DNA (mtDNA) clades, but their evolutionary origin is unknown. In this study, we conducted phylogeographic analyses of M. anguillicaudatus that were based on mtDNA cytochrome b sequences to clarify the evolutionary origin of the two distinct mtDNA clades. This newly obtained data were integrated with the mtDNA sequence data obtained in previous studies and reanalysed. The results showed that one major clade originated because of mtDNA introgression from a loach of the genus Cobitis. The geographic range of the populations carrying non-introgressed mtDNA tended to be limited to the peripheral areas of the Japanese Islands, whereas the range of the populations carrying introgressed mtDNA was spread over wide regions of the Japanese Islands. These distribution and divergence patterns suggested that M. anguillicaudatus populations carrying introgressed mtDNA have spread and replaced the range of populations carrying non-introgressed mtDNA.