Recent origin and adaptive diversification of Ainsliaea (Asteraceae) in the Ryukyu Islands: molecular phylogenetic inference using nuclear microsatellite markers
Recent origin and adaptive diversification of Ainsliaea (Asteraceae) in the Ryukyu Islands: molecular phylogenetic inference using nuclear microsatellite markers
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DOI：
10.1007/s00606-012-0608-6
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发表时间：
2012-05-01
影响因子：
1.9
通讯作者：
Setoguchi, Hiroaki
中科院分区：
文献类型：
--
作者：
Mitsui, Yuki;Setoguchi, Hiroaki
我们调查了4个密切相关的兔耳风属物种（菊科）在亚洲东部的大陆琉球群岛，其中包括两个洪水适应的“rheophyte”和两个非rheophyte（内陆）的物种，基于12个核微卫星位点的植物发生和植物地理。对26个居群的420个个体进行系统发育分析表明，流生A. linearis和A. oblonga在基因上是不同的。每个物种都与发生在同一岛屿上的内陆物种聚集在一起，这表明这两种植物的祖先不同，它们是通过局部适应洪水栖息地而独立进化的。邻位连接聚类和主坐标分析结果表明，南方居群中的A. macroclinidioides是不同的谱系和祖先的北方人口以及其他多样化的物种复合体在琉球群岛。这些结果表明，殖民模式最初从亚洲大陆到南部岛屿，然后由北方岛屿通过陆桥第四纪冰川期间产生的。从南方种群隔离后，物种辐射和区域分化内的北方分支可能发生通过当地的适应和/或地理隔离的细分岛桥。
We investigated the phylogeny and phylogeography of four closely related Ainsliaea species (Asteraceae) on the continental Ryukyu Islands of eastern Asia, which consist of two flood-adapted "rheophyte" and two non-rheophyte (inland) species, based on 12 nuclear microsatellite loci. Phylogenetic analyses using 420 individuals from 26 populations showed that rheophytic A. linearis and A. oblonga are genetically distinct. Each species was clustered with the inland species that occur on the same islands, suggesting a different ancestry for the two rheophytes that evolved independently by local adaptation to flooded habitats. The results from the neighbor-joining clustering and principal coordinate analysis (PCoA) indicate that the southern populations of A. macroclinidioides are distinct lineages and ancestral to the northern populations as well as the other diverse species complex in the Ryukyus. These results suggest a pattern of colonization initially from the Asian mainland to the southern islands, followed by the northern islands via land bridges generated during the Quaternary glaciations. After isolation from southern populations, species radiation and regional differentiation within the northern clade occurred possibly via local adaptation and/or geographic isolation of the subdivided island bridge.