From glacial refugia to wide distribution range: demographic expansion of Loropetalum chinense (Hamamelidaceae) in Chinese subtropical evergreen broadleaved forest
From glacial refugia to wide distribution range: demographic expansion of Loropetalum chinense (Hamamelidaceae) in Chinese subtropical evergreen broadleaved forest
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从冰川避难所到广泛分布范围：中国亚热带常绿阔叶林中檵木（金缕梅科）的种群扩张
DOI：
10.1007/s13127-015-0252-4
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发表时间：
2016-03-01
影响因子：
1.6
通讯作者：
Zhang, Dianxiang
中科院分区：
文献类型：
--
作者：
Gong, Wei;Liu, Wanzhen;Zhang, Dianxiang
中国亚热带万年青阔叶林是世界上最具多样性和生物学意义的森林系统之一。长期以来，人们一直在争论这一地区是否在更新世冰期和冰消期受到了巨大的影响，例如，范围大小和物种丰富度的变化。本文报道了一个大比例尺的植物地理学研究，重点研究了中国植物群落的一个广泛分布的典型组成种--红瓣木（Loropetalum chinense（R.（英国）奥利弗（金缕梅科）。共收集到56个分布于整个分布区的居群。chinense进行了分析。利用叶绿体DNA序列变异和AFLP分子标记技术，结合生态位模型（ENM），研究了水稻品种的遗传多样性。ENM结果表明，L.中华绒螯蟹种群数量显著减少，大部分种群向南退缩。根据ENM、cpDNA单倍型的地理分布模式和AFLP遗传聚类分析，在中国南方南岭山地区发现了一个冰川避难所，在重庆三峡地区和大巴山地区发现了第二个冰川避难所。除了ENM之外，通过不匹配分布分析和贝叶斯天际线图，还推断人口扩张约为10.6 kya。目前遗传变异的地理分布格局可能是分别沿沿着南岭和武夷山向北和向东扩展形成的。此外，这两条山脉被认为是限制南方和北方人口之间基因流动的地理屏障。因此，我们的目标是进一步贡献一个案例研究，这将有助于提高更深入地了解过去的植被动态和植物区系的演变途径，中国STEBF的植被类型的地理历史。
The subtropical evergreen broadleaved forest (STEBF) in China is globally one of the most diverse and biologically important forest systems. There has been a long-term debate whether this region was affected dramatically during Pleistocene glaciation and deglaciation cycles, e.g., in terms of range dimensions and changes in species richness. Here we report a large-scale phylogeographic study, focusing on a widespread and typical constituent species of the Chinese STEBF, Loropetalum chinense (R. Br.) Oliver (Hamamelidaceae). In total, 56 populations spanning the entire distribution range of L. chinense were analyzed. Chloroplast DNA sequence variation and AFLPs as molecular marker systems were used in combination with ecological niche modeling (ENM). ENM indicated that the distribution ranges of L. chinense were contracted remarkably and most populations retreated southward. Thereby, based on ENM, geographical distribution pattern of cpDNA haplotypes, and AFLP genetic clusters, one glacial refuge was inferred in the Nanling Mountains in southern China, and a second glacial refuge was identified in Three Gorges Area and Dabashan Mountains in Chongqing Province, southwestern China. In addition to ENM, with mismatch distribution analysis and Bayesian skyline plots, demographic expansion was inferred to take place about 10.6 kya. The current geographic distribution pattern of genetic variation might be shaped by northward and eastward expansion along Nanling Mountains and Wuyishan Mountains, respectively. Additionally, the two mountain ranges were supposed to act as geographical barriers restricting gene flow between the southern and northern populations. Herewith, we aim to further contribute a case study of the phylogeographic history of this vegetation type, which will help to improve deeper understanding of past vegetation dynamics and floristic evolutionary pathways of the Chinese STEBF.