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首页> 外文期刊>Zoological Science >Genetic Diversity and Differentiation of the Ryukyu Endemic Frog Babina holsti as Revealed by Mitochondrial DNA
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Genetic Diversity and Differentiation of the Ryukyu Endemic Frog Babina holsti as Revealed by Mitochondrial DNA

机译：线粒体DNA揭示的琉球地方性蛙白粉病的遗传多样性和分化

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摘要

We surveyed the genetic diversity and genetic differentiation of an endangered frog, Babina holsti, endemic to Okinawajima and Tokashikijima Islands of the Ryukyus, to elucidate its divergence history and obtain basic data for its conservation. Genetic differentiation between the two island lineages is moderate (3.1% p-distance in the cyt b gene). This result suggests that the two island lineages have been isolated between the late Pliocene and the middle Pleistocene and have never migrated between the current northern part of Okinawajima and Tokashikijima Islands, which were once connected in the late Pleistocene glacial age. On Okinawajima Island, the southernmost sample was constituted by a unique haplotype, without considerable genetic distance from haplotypes detected from northern samples. This unique haplotype composition in the southernmost sample would have resulted from the restricted gene flow between the southernmost population and the other populations in Okinawajima Island. Furthermore, the absence of genetic diversity within the southernmost sample indicates that this population has recently experienced population size reduction, possibly by predation pressure from an introduced mongoose, which is more abundant in the southern part than in the northern part of the island. Lower genetic diversity in the Tokashikijima sample implies a small effective population size for mitochondrial DNA (mtDNA) in B. holsti on the island. Immediate conservation measures should be taken for the populations from the southernmost range in Okinawajima and Tokashikijima.
机译：我们调查了琉球冲绳岛和十胜岛岛特有的濒临灭绝的青蛙Babina holsti的遗传多样性和遗传分化，以阐明其发散历史并获得其保护的基础数据。两个岛谱系之间的遗传分化是中等的（cyt b基因中p距离为3.1％）。该结果表明，这两个岛谱系在上新世晚期和中更新世之间是孤立的，并且从未在现在的更新世冰川时代曾经连接的冲绳岛北部和十日岛之间迁移。在冲绳岛上，最南端的样本由独特的单倍型构成，与从北部样本中检测到的单倍型之间没有很大的遗传距离。最南端样本中这种独特的单倍型组成可能是由于冲绳岛上最南端种群与其他种群之间的基因流受限所致。此外，最南端的样本中没有遗传多样性，这表明该种群最近经历了种群减少，这可能是由于引入的猫鼬的捕食压力造成的，该猫的南部比该岛的北部丰富。 Tokashikijima样本中较低的遗传多样性意味着该岛上霍尔德氏杆菌中线粒体DNA（mtDNA）的有效种群较小。应该对冲绳岛和十k岛的最南端的居民立即采取保护措施。

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