Unique parallel radiations of high-mountainous species of the genus Sedum (Crassulaceae) on the continental island of Taiwan
Unique parallel radiations of high-mountainous species of the genus Sedum (Crassulaceae) on the continental island of Taiwan
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DOI：
10.1016/j.ympev.2017.03.028
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发表时间：
2017-08-01
影响因子：
4.1
通讯作者：
Kokubugata, Goro
中科院分区：
文献类型：
--
作者：
Ito, Takuro;Yu, Chih-Chieh;Kokubugata, Goro
探讨了景天属植物的时空多样性。（景天科）在台湾的nrITS和cpDNA序列的分子分析的基础上从东亚景天属成员。我们的系统发育和祖先区域重建分析表明，台湾景天包括两个谱系，独立迁移从日本和中国东部。此外，这两个分支中的物种之间的遗传距离小于其他东亚景天分支，和台湾成员的每片林地占据了非常不同的栖息地，在高山地区相似的生态位。这些数据表明，物种多样化发生在平行的两个台湾景天谱系，这些平行的辐射可能发生在台湾的小大陆岛屿。此外，台湾佛甲草的分歧时间估计表明，这两个辐射可能已在台湾早更新世的山脉形成相关。我们认为，这些平行的辐射可能是由于台湾的地理动态和特定的生物学特性，使他们能够适应新的生态位的景天属。(C)2017爱思唯尔公司All rights reserved.
We explored the temporal and spatial diversification of the plant genus Sedum L. (Crassulaceae) in Taiwan based on molecular analysis of nrITS and cpDNA sequences from East Asian Sedum members. Our phylogenetic and ancestral area reconstruction analysis showed that Taiwanese Sedum comprised two lineages that independently migrated from Japan and Eastern China. Furthermore, the genetic distances among species in these two clades were smaller than those of other East Asian Sedum clades, and the Taiwanese members of each Glade occupy extremely varied habitats with similar niches in high-mountain regions. These data indicate that species diversification occurred in parallel in the two Taiwanese Sedum lineages, and that these parallel radiations could have occurred within the small continental island of Taiwan. Moreover, the estimated time of divergence for Taiwanese Sedum indicates that the two radiations might have been correlated to the formation of mountains in Taiwan during the early Pleistocene. We suggest that these parallel radiations may be attributable to the geographical dynamics of Taiwan and specific biological features of Sedum that allow them to adapt to new ecological niches. (C) 2017 Elsevier Inc. All rights reserved.