叶绿体微卫星揭示加那利岛松的定殖和集合种群动态
Chloroplast microsatellites reveal colonization and metapopulation dynamics in the Canary Island pine
摘要：
叶绿体微卫星已成为植物群体遗传学研究中越来越受欢迎的标记，但很少有人关注它们在人口统计推断方面的潜力。在这项工作中，利用叶绿体微卫星研究群体扩展进行了探索。首先，我们研究了失配分布分析和F（S）检验的功效，并结合不同人口情景的模拟。然后，我们将这些方法应用于经验数据获得的加那利群岛松（Pinus canariensis）。模拟结果表明，叶绿体微卫星对种群的突然增长十分敏感。F（S）检验的功效和人口统计学参数估计的准确性（如扩展时间）与数据内的同质性水平成比例降低。加那利群岛的松树叶绿体微卫星数据的分析表明，人口扩张，几乎所有的样本地点。岛屿一级的人口扩张可以用松树在群岛上的殖民化来解释，而岛屿内不同地点不同年龄的人口扩张则可能是地方性迁移和岛屿化动态的结果。来自P. canariensis的寄生虫象鼻虫Brachyderes rugatus的可比线粒体DNA序列数据支持这种情况，表明火山活动在加那利群岛松林群落的演变中发挥了关键作用。
英文摘要：
Chloroplast microsatellites are becoming increasingly popular markers for population genetic studies in plants, but there has been little focus on their potential for demographic inference. In this work the utility of chloroplast microsatellites for the study of population expansions was explored. First, we investigated the power of mismatch distribution analysis and the F(S) test with coalescent simulations of different demographic scenarios. We then applied these methods to empirical data obtained for the Canary Island pine (Pinus canariensis). The results of the simulations showed that chloroplast microsatellites are sensitive to sudden population growth. The power of the F(S) test and accuracy of demographic parameter estimates, such as the time of expansion, were reduced proportionally to the level of homoplasy within the data. The analysis of Canary Island pine chloroplast microsatellite data indicated population expansions for almost all sample localities. Demographic expansions at the island level can be explained by the colonization of the archipelago by the pine, while population expansions of different ages in different localities within an island could be the result of local extinctions and recolonization dynamics. Comparable mitochondrial DNA sequence data from a parasite of P. canariensis, the weevil Brachyderes rugatus, supports this scenario, suggesting a key role for volcanism in the evolution of pine forest communities in the Canary Islands.
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