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首页> 美国卫生研究院文献>Ecology and Evolution >Combining the least cost path method with population genetic data and species distribution models to identify landscape connectivity during the late Quaternary in Himalayan hemlock
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Combining the least cost path method with population genetic data and species distribution models to identify landscape connectivity during the late Quaternary in Himalayan hemlock

机译：将最小成本路径方法与种群遗传数据和物种分布模型相结合以识别喜马拉雅铁杉第四纪晚期的景观连通性

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Himalayan hemlock (Tsuga dumosa) experienced a recolonization event during the Quaternary period; however, the specific dispersal routes are remain unknown. Recently, the least cost path (LCP) calculation coupled with population genetic data and species distribution models has been applied to reveal the landscape connectivity. In this study, we utilized the categorical LCP method, combining species distribution of three periods (the last interglacial, the last glacial maximum, and the current period) and locality with shared chloroplast, mitochondrial, and nuclear haplotypes, to identify the possible dispersal routes of T. dumosa in the late Quaternary. Then, both a coalescent estimate of migration rates among regional groups and establishment of genetic divergence pattern were conducted. After those analyses, we found that the species generally migrated along the southern slope of Himalaya across time periods and genomic makers, and higher degree of dispersal was in the present and mtDNA haplotype. Furthermore, the direction of range shifts and strong level of gene flow also imply the existence of Himalayan dispersal path, and low area of genetic divergence pattern suggests that there are not any obvious barriers against the dispersal pathway. Above all, we inferred that a dispersal route along the Himalaya Mountains could exist, which is an important supplement for the evolutionary history of T. dumosa. Finally, we believed that this integrative genetic and geospatial method would bring new implications for the evolutionary process and conservation priority of species in the Tibetan Plateau.
机译：喜马拉雅铁杉（Tsuga dumosa）在第四纪期间经历了重新定殖事件；然而，具体的分散途径仍是未知的。最近，最小成本路径（LCP）计算与种群遗传数据和物种分布模型相结合已被用于揭示景观连通性。在这项研究中，我们使用分类LCP方法，将三个时期（最后一个冰期之间，最后一个冰川最大期和当前时期）的物种分布和局部性与共有的叶绿体，线粒体和核单倍型相结合，以确定可能的扩散途径第四纪末期T. dumosa的雕像。然后，进行了区域群之间迁移率的联合估计和遗传差异模式的建立。经过这些分析，我们发现该物种通常在各个时期和基因组制造者之间沿着喜马拉雅山南坡迁移，并且目前和mtDNA单倍型的扩散程度更高。此外，范围转移的方向和强大的基因流动水平也暗示着喜马拉雅分散路径的存在，而遗传散布图的低区域表明没有任何明显的阻碍分散路径的障碍。最重要的是，我们推断可能存在沿着喜马拉雅山脉的散布路线，这是对杜鹃花进化史的重要补充。最后，我们认为这种整合的遗传和地理空间方法将为青藏高原物种的进化过程和物种优先保护带来新的含义。

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