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首页> 外文期刊>Environmental Biology of Fishes >High intra-population genetic variability and inter-population differentiation in a plateau specialized fish, Triplophysa orientalis
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High intra-population genetic variability and inter-population differentiation in a plateau specialized fish, Triplophysa orientalis

机译：高原特化鱼类东方三叶蝉的高种群内遗传变异性和种群间分化

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摘要

Triplophysa orientalis (Herzenstein) is one of the Nemacheilinae (Cypriniformes: Balitoridae) fish species distributed in the Tibetan Plateau area. In order to understand the impact of plateau uplift on population history and the isolation effect of plateau lakes on T. orientalis, we examined its genetic structure and phylogenetic relationships. A total of 98 individuals from five wild populations, three from plateau lakes and two from branch rivers in upper reaches of the Yangtze River, in the eastern peripheral of the Tibetan Plateau were sampled. An 848 base pair fragment from the mitochondrial DNA (mtDNA) control region was sequenced for analyses. Overall, very high intra-population genetic variability was found in all populations except for one lake population (Rannicuo); nucleotide diversity ranged from 0.0025 to 0.0159 and haplotype diversity ranged from 0.641 to 0.879. Furthermore, the genetic distance between river populations (0.0326) was much higher than that among lake populations (Rannicuo and Barencuo 0.0035, Bannicuo and Yibicuo 0.0038, Rannicuo and Yibicuo 0.0049). Additionally, the analysis of molecular variance demonstrated that most of the observed genetic variability occurred among populations, accompanied with significant Fst values except for that between the Yibicuo and Barencuo populations. This evidence suggested a strong population structure of the species and a lack of inter-population connection. Lastly, the rate of migration indicated there were large historic gene flows among lake populations. Demographic analysis also indicated there were bottlenecks or expansions in three lake populations, suggesting a potential isolation effect of plateau lakes on population differentiation. Molecular dating of intra-specific divergence showed the plateau uplift has shaped the genetic structure of T. orientalis.
机译：Triplophysa Orientalis（Herzenstein）是分布在青藏高原地区的Nemacheilinae（Cypriniformes：Balitoridae）鱼类之一。为了了解高原隆升对种群历史的影响以及高原湖泊对东方侧柏的隔离作用，我们检查了其遗传结构和系统发育关系。在青藏高原东部外围，共采集了来自五个野生种群的98个人，其中三个来自高原湖泊，两个来自支流河。对来自线粒体DNA（mtDNA）控制区的848个碱基对片段进行测序以进行分析。总体而言，除一个湖泊种群（Rannicuo）外，所有种群的种群内遗传变异性都很高。核苷酸多样性的范围为0.0025至0.0159，单倍型多样性的范围为0.641至0.879。此外，河流种群之间的遗传距离（0.0326）远高于湖泊种群之间的遗传距离（Rannicuo和Barencuo为0.0035，Bannicuo和Yibicuo为0.0038，Rannicuo和Yibicuo为0.0049）。此外，分子变异分析表明，大多数观察到的遗传变异发生在种群之间，并伴随着显着的Fst值，除了宜比可和巴伦库种群之间的值。该证据表明该物种的种群结构很强，并且缺乏种群间的联系。最后，迁移速度表明湖泊种群之间有大量的历史基因流。人口统计学分析还表明，三个湖泊种群存在瓶颈或扩张，这表明高原湖泊对种群分化具有潜在的隔离作用。种内差异的分子测年表明，高原隆升已塑造了东方侧柏的遗传结构。

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