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首页> 外文期刊>Zoological Science >Phylogenetic relationships and intraspecific variations of loaches of the genus Lefua (Balitoridae, Cypriniformes)
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Phylogenetic relationships and intraspecific variations of loaches of the genus Lefua (Balitoridae, Cypriniformes)

机译：系统发育关系和种内变异的Lefua属（B鱼，蛛形纲）

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摘要

Three nominal species are known in East Asian balitorid loaches of the genus Lefua, i.e. L. echigonia, L. nikkonis, and L. costata. Lefua echigonia, with large morphological variations was recently separated into two groups, L. echigonia including the holotype and L. sp., based on morphological and ecological traits. We performed protein and DNA analyses to elucidate phylogenetic relationships among loaches of the genus Lefua and to settle the taxonomic status of L. sp. We also investigated intraspecific variations in L. echigonia s. str. to shed light on the process of formation of freshwater fish fauna in Japan. Protein analyses using two-dimensional gel electrophoresis showed that genetic distances between L. sp. and L. echigonia s. str. and between L. sp. and L. nikkonis were as large as that between L. echigonia s. str. and L. nikkonis. DNA analyses of the mitochondrial D-loop region showed that L. sp. and L. echigonia s. str. were monophyletic, respectively, while neither L. nikkonis nor L. costata was monophyletic and these species formed together a clade. The results supported the specific status of L. sp. and proposed reevaluation of the taxonomic status of L. nikkonis and L. costata. DNA analyses also showed that L. sp. was more closely related to L. echigonia s. str. than to the L. nikkonis-L. costata complex, and four local populations were distinguished in L. echigonia s. str. Distribution patterns of the four local populations of L. echigonia s. str. in Japan were approximately congruent with those of the medaka, Oryzias latipes, suggesting that differentiation in the two distantly related fishes have a common historical background.
机译：在Lefua属的东亚鱼泥ache中，已知有三种标称物种，即沙门氏菌（L. echigonia），尼康氏菌（L. nikkonis）和哥氏乳杆菌（L. costata）。基于形态和生态特征，形态学差异较大的Lefua echigonia最近被分为两组，包括整型的L. echigonia和L. sp.。我们进行了蛋白质和DNA分析，以阐明Lefua属泥ache之间的系统发生关系，并确定L. sp。的分类状态。我们还调查了沙门氏菌的种内变异。海峡阐明日本淡水鱼类区系的形成过程。使用二维凝胶电泳的蛋白质分析显示，L。sp。之间的遗传距离。和L. echigonia s。海峡和L. sp。之间和L. nikkonis和L. echigonia s一样大。海峡和尼康尼斯线粒体D环区域的DNA分析表明，L。sp。和L. echigonia s。海峡它们分别是单种的，而尼康乳酸菌和肋骨的L.都不是单种的，并且这些物种一起形成了进化枝。结果支持了L. sp。的特定状态。并建议重新评估尼康湖和科斯塔湖的分类学地位。 DNA分析还显示出L.sp。与L. echigonia s密切相关。海峡比L. nikkonis-L costata复合体，和四个地方人口在L. echigonia s。海峡沙门氏菌4个当地种群的分布格局。海峡在日本与med（Moryaka）的稻（Oryzias latipes）大致一致，这表明两种远缘鱼类的分化具有共同的历史背景。

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