Geological and ecological factors drive cryptic speciation of yews in a biodiversity hotspot
Geological and ecological factors drive cryptic speciation of yews in a biodiversity hotspot
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地质和生态因素驱动生物多样性热点地区红豆杉的神秘物种形成
DOI：
10.1111/nph.12336
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发表时间：
2013-09-01
期刊：
影响因子：
9.4
通讯作者：
Li, De-Zhu
中科院分区：
文献类型：
--
作者：
Liu, Jie;Moeller, Michael;Li, De-Zhu
喜马拉雅—横断山区地形隆升与气候变化的相互作用在物种形成和人口统计中起着关键作用。为了进一步了解这些过程，我们结合分子系统地理学和物种分布模型研究了它们对红豆杉的影响。对43个居群进行了分子分析。19个气候变量与遗传不连续一起进行了分析。进行物种分布建模，预测潜在的过去分布范围。鉴定出两个不同的谱系，它们分化于c. 4.2（2.0-6）。与气候变量的相关性也表明，生态因素可能进一步加强了这两个谱系的分离。在最后一次冰河时期，这两个谱系都经历了人口扩张。高遗传分化、长期隔离和生态分化表明，黄颡鱼的隐种形成与HHM地区的地质和气候变化有关。我们的发现也挑战了HHM最后一次冰期期间总体人口“收缩”的概念。
The interplay of orographic uplift and climatic changes in the Himalaya-Hengduan Mountains region (HHM) have had a key role in speciation and population demography. To gain further insight into these processes, we investigated their effects on Taxus wallichiana by combining molecular phylogeography and species distribution modeling.Molecular data were obtained from 43 populations of T. wallichiana. Nineteen climatic variables were analyzed alongside genetic discontinuities. Species distribution modeling was carried out to predict potential past distribution ranges.Two distinct lineages were identified, which diverged c. 4.2 (2.0-6.5) million years ago (Ma), a timescale that corresponds well with the recent uplift of the Qinghai-Tibet Plateau and subsequent climatic changes of the region. Correlations with climatic variables also suggest that ecological factors may have further reinforced the separation of the two lineages. Both lineages experienced population expansion during the last glaciation.The high genetic divergence, long-term isolation and ecological differentiation suggest a scenario of cryptic speciation in T. wallichiana associated with geological and climatic changes in the HHM. Our findings also challenge the notion of general population 'contraction' during the last glaciation in the HHM.