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首页> 美国卫生研究院文献>Scientific Reports >Contributions of historical and contemporary geographic and environmental factors to phylogeographic structure in a Tertiary relict species Emmenopterys henryi (Rubiaceae)
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Contributions of historical and contemporary geographic and environmental factors to phylogeographic structure in a Tertiary relict species Emmenopterys henryi (Rubiaceae)

机译：历史和当代地理及环境因素对第三遗迹种（Emmenopterys henryi）的植物地理结构的贡献

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Examining how historical and contemporary geographic and environmental factors contribute to genetic divergence at different evolutionary scales is a central yet largely unexplored question in ecology and evolution. Here, we examine this key question by investigating how environmental and geographic factors across different epochs have driven genetic divergence at deeper (phylogeographic) and shallower (landscape genetic) evolutionary scales in the Chinese Tertiary relict tree Emmenopterys henryi. We found that geography played a predominant role at all levels – phylogeographic clades are broadly geographically structured, the deepest levels of divergence are associated with major geological or pre-Quaternary climatic events, and isolation by distance (IBD) primarily explained population genetic structure. However, environmental factors are clearly also important – climatic fluctuations since the Last Interglacial (LIG) have likely contributed to phylogeographic structure, and the population genetic structure (in our AFLP dataset) was partly explained by isolation by environment (IBE), which may have resulted from natural selection in environments with divergent climates. Thus, historical and contemporary geography and historical and contemporary environments have all shaped patterns of genetic structure in E. henryi, and, in fact, changes in the landscape through time have also been critical factors.
机译：研究历史和当代地理和环境因素如何在不同的进化尺度上促进遗传差异是生态学和进化中一个核心但很大程度上尚未探讨的问题。在这里，我们通过调查不同时期的环境和地理因素如何在中国第三纪遗物树Emmenopterys henryi的较深（地理学）和较浅（景观遗传）进化尺度上驱动遗传差异，来研究这个关键问题。我们发现地理在所有层次上都起着主要作用-地理进化枝的地理结构广泛，最深的差异与主要的地质或第四纪前的气候事件有关，而按距离隔离（IBD）主要解释了种群的遗传结构。但是，环境因素显然也很重要-自上次冰间期（LIG）以来的气候波动可能有助于系统地理结构，而种群遗传结构（在我们的AFLP数据集中）部分是通过环境隔离（IBE）来解释的，是在气候变化的环境中自然选择的结果。因此，历史和当代地理学以及历史和当代环境都具有亨氏大肠杆菌的遗传结构的所有形态，事实上，随着时间的推移，景观的变化也是关键因素。

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