Contributions of historical and contemporary geographic and environmental factors to phylogeographic structure in a Tertiary relict species, Emmenopterys henryi (Rubiaceae).
Contributions of historical and contemporary geographic and environmental factors to phylogeographic structure in a Tertiary relict species, Emmenopterys henryi (Rubiaceae).
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历史和当代地理和环境因素对第三纪孑遗物种香果树（茜草科）系统发育地理学结构的贡献
DOI：
10.1038/srep24041
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发表时间：
2016-05-03
影响因子：
4.6
通讯作者：
Qiu YX
中科院分区：
文献类型：
--
作者：
Zhang YH;Wang IJ;Comes HP;Peng H;Qiu YX
研究历史和当代的地理和环境因素如何在不同的进化尺度上促进遗传分化是生态学和进化中一个核心但在很大程度上尚未探索的问题。在这里，我们研究这个关键问题，通过调查不同时代的环境和地理因素如何驱动遗传分化在更深（地理）和更浅（景观遗传）的进化尺度在中国第三纪孑遗树Emperiterys henryi。我们发现，地理发挥了主导作用，在各个层面上，广泛的地理分支的地理结构，最深层次的分歧与主要的地质或前第四纪气候事件和隔离的距离（IBD）主要解释人口遗传结构。然而，环境因素显然也很重要--末次间冰期（LIG）以来的气候波动可能导致了物种的地理结构，而种群遗传结构（在我们的AFLP数据集中）部分可以用环境隔离（IBE）来解释，这可能是气候差异环境中的自然选择造成的。因此，历史和当代地理以及历史和当代环境都塑造了E.事实上，随着时间的推移，景观的变化也是关键因素。
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.