A molecular phylogeny of Dichocarpum (Ranunculaceae): Implications for eastern Asian biogeography.

A molecular phylogeny of Dichocarpum (Ranunculaceae): Implications for eastern Asian biogeography.
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Dichocarpum(毛茛科)的分子系统发育:对东亚生物地理学的启示。

DOI:
10.1016/j.ympev.2016.12.026
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发表时间:
2017-02
影响因子:
4.1
通讯作者:
Wei Wang
Wei Wang
中科院分区:
生物学1区
文献类型:
--
作者:
Andrey S. Erst;Sheng-Xiang Yu;Florian Jabbour;Wei Wang

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东亚的特点是物种多样性高且特有。然而,该地区生物多样性分布的生物地理模式和过程仍然知之甚少。在这项研究中,我们使用质体(matK、trnL-F 和 trnH-psbA)和核(ITS)DNA 序列来研究 Dichocarpum(毛茛科)的历史生物地理学,这是一种遍布该地区暖温带和亚热带森林的东亚特有属。系统发育分析有力地支持了 Dichocarpumas 单系,它包含两个主要分支。进化枝I对应于Hutchinsonia组,进化枝II包括DichocarpumandFargesia组。 Dichocarpuman 组及其亚组 Dalzielia 和 Dichocarpuma 不被认为是单系的。我们的研究结果表明,早中新世早期,芒草的最近共同祖先出现在中国中部和日本,从而支持日本和中国之间存在古老的替代事件。在中国大陆,三种物种水平的迁徙被假设来解释芒草从中国中部向云南东南部、横断山脉和喜马拉雅东部的扩张。这些迁徙事件发生在晚中新世至早上新世,可能与该时期青藏高原东南部的隆升以及中国亚热带森林的扩张有关。据推断,早更新世有从中国中部迁移或扩散到台湾的现象,这支持了台湾与中国大陆之间植物区系的密切联系。这项研究有助于我们了解东亚植物的历史生物地理学。
East Asia is characterized by high levels of species diversity and endemism. However, the biogeographical patterns and processes underlying the distribution of biodiversity within the area are still poorly known. In this study, we used plastid (matK,trnL-F, andtrnH-psbA) and nuclear (ITS) DNA sequences to investigate the historical biogeography ofDichocarpum(Ranunculaceae), an eastern Asian endemic genus throughout warm-temperate and subtropical forests of the area. Phylogenetic analyses strongly supportDichocarpumas monophyletic, which contains two major clades. Clade I corresponds to sectionHutchinsonia, and clade II includes sectionsDichocarpumandFargesia. SectionDichocarpumand its subsectionsDalzieliaandDichocarpumare not recognized as monophyletic. Our results suggest that the most recent common ancestor ofDichocarpumoccurred in central China and Japan in the earliest Early Miocene, and thus support an ancient vicariance event between Japan and China. Within mainland China, three migrations at the species level were hypothesized to explain the expansion ofDichocarpumfrom central China to southeastern Yunnan, Hengduan mountains, and eastern Himalaya. These migration events occurred in the Late Miocene to Early Pliocene, which may be associated with the uplift of the southeastern Qinghai-Tibetan Plateau and accordingly the expansion of subtropical forests in China around that period. A migration or dispersal from central China to Taiwan was inferred in the Early Pleistocene, which supports the close floristic affinity between Taiwan and mainland China. This study contributes to our knowledge on the historical biogeography of plants in eastern Asia.
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