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首页> 外文期刊>Zoological Science >Genetic Structure and Demographic History of the Endangered and Endemic Schizothoracine Fish Gymnodiptychus pachycheilus in Qinghai-Tibetan Plateau
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Genetic Structure and Demographic History of the Endangered and Endemic Schizothoracine Fish Gymnodiptychus pachycheilus in Qinghai-Tibetan Plateau

机译：青藏高原濒危和地方特有的裂殖壶cine鱼裸胸肉的遗传结构和人口史

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摘要

The endangered schizothoracine fish Gymnodiptychus pachycheilus is endemic to the Qinghai-Tibetan Plateau (QTP), but very little genetic information is available for this species. Here, we accessed the current genetic divergence of G. pachycheilus population to evaluate their distributions modulated by contemporary and historical processes. Population structure and demographic history were assessed by analyzing 1811-base pairs of mitochondrial DNA from 61 individuals across a large proportion of its geographic range. Our results revealed low nucleotide diversity, suggesting severe historical bottleneck events. Analyses of molecular variance and the conventional population statistic F-ST (0.0435, P = 0.0215) confirmed weak genetic structure. The monophyly of G. pachycheilus was statistically well-supported, while two divergent evolutionary clusters were identified by phylogenetic analyses, suggesting a microgeographic population structure. The consistent scenario of recent population expansion of two clusters was identified based on several complementary analyses of demographic history (0.096 Ma and 0.15 Ma). This genetic divergence and evolutionary process are likely to have resulted from a series of drainage arrangements triggered by the historical tectonic events of the region. The results obtained here provide the first insights into the evolutionary history and genetic status of this little-known fish.
机译：濒临灭绝的裂殖壶cine鱼Gymnodiptychus pachycheilus是青藏高原的特有物种，但是该物种的遗传信息很少。在这里，我们访问了G. pachycheilus种群的当前遗传差异，以评估其受当代和历史进程调节的分布。通过分析来自61个个体的1811个碱基的线粒体DNA的很大一部分地理区域，评估了其种群结构和人口历史。我们的结果表明核苷酸多样性低，提示严重的历史瓶颈事件。分子变异分析和传统的人口统计F-ST（0.0435，P = 0.0215）证实了其较弱的遗传结构。在统计学上有很好的支持G. pachycheilus的单一性，同时通过系统进化分析确定了两个不同的进化簇，这表明了微观地理种群结构。根据对人口历史的一些补充分析（0.096 Ma和0.15 Ma），确定了两个集群近期人口膨胀的一致情况。这种遗传差异和进化过程可能是由于该地区的历史构造事件触发了一系列排水安排而导致的。此处获得的结果提供了对这种鲜为人知的鱼的进化历史和遗传状态的初步见解。

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