Quaternary climate change drives allo-peripatric speciation and refugial divergence in the Dysosma versipellis-pleiantha complex from different forest types in China.
Quaternary climate change drives allo-peripatric speciation and refugial divergence in the Dysosma versipellis-pleiantha complex from different forest types in China.
复制标题
第四纪气候变化驱动中国不同森林类型八角茴香-五角莲复合体的异域物种形成和避难所分化
DOI：
10.1038/srep40261
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发表时间：
2017-01-11
影响因子：
4.6
通讯作者：
Qiu YX
中科院分区：
文献类型：
--
作者：
Wang YH;Comes HP;Cao YN;Guo R;Mao YR;Qiu YX
中国亚热带地区拥有世界上最多样化的温带植物群，但人们对该地区异常高水平的物种多样性和特有性背后的地理和生态气候因素的作用知之甚少。在这里，我们解决这个关键问题，通过调查的时空和生态过程中的分歧八角莲-多花种复合体，特有的亚热带中国。我们的cpDNA同源性分析表明，这一单系群的林下草本植物是来自上新世晚期的青藏高原（QTP）/中国西南地区的祖先。遗传和ENM数据结合生态位分化分析支持D. versipellis和D. pleiantha进行通过allo-peripatric物种形成，可能引发了早更新世气候变化，而随后的气候引起的周期范围收缩/扩张增强了生态地理隔离的两个类群。此外，群体遗传数据的建模表明，主要的谱系分歧内D。versipellis可能是由于在末次冰期/间冰期期间，在多个局部避难所中长期异地种群隔离的结果，这反过来又促进了特有种的形成（D. difformis、异花盾蚧D. majoensis）内的D.中国西南部的一个属。这些研究结果表明，第四纪气候变化在触发这组在亚热带中国的森林限制植物物种的异域（初期）物种形成的压倒一切的作用。
Subtropical China harbours the world’s most diverse temperate flora, but little is known about the roles of geographical and eco-climatic factors underlying the region’s exceptionally high levels of species diversity and endemism. Here we address this key question by investigating the spatio-temporal and ecological processes of divergence within the Dysosma versipellis-pleiantha species complex, endemic to subtropical China. Our cpDNA phylogeny showed that this monophyletic group of understory herbs is derived from a Late Pliocene ancestor of the Qinghai-Tibetan Plateau (QTP)/Southwest China. Genetic and ENM data in conjunction with niche differentiation analyses support that the early divergence of D. versipellis and D. pleiantha proceeded through allo-peripatric speciation, possibly triggered by Early Pleistocene climate change, while subsequent climate-induced cycles of range contractions/expansions enhanced the eco-geographical isolation of both taxa. Furthermore, modelling of population-genetic data indicated that major lineage divergences within D. versipellis likely resulted from long-term allopatric population isolation in multiple localized refugia over the last glacial/interglacial periods, and which in turn fostered endemic species formation (D. difformis, D. majoensis) from within D. versipellis in Southwest China. These findings point to an overriding role of Quaternary climate change in triggering essentially allopatric (incipient) speciation in this group of forest-restricted plant species in subtropical China.