Genetic diversity, structure, and demography of Pandanus boninensis (Pandanaceae) with sea drifted seeds, endemic to the Ogasawara Islands of Japan: Comparison between young and old islands
Genetic diversity, structure, and demography of Pandanus boninensis (Pandanaceae) with sea drifted seeds, endemic to the Ogasawara Islands of Japan: Comparison between young and old islands
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DOI：
10.1111/mec.15383
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发表时间：
2020-02
影响因子：
4.9
通讯作者：
S. Setsuko;Kyoko Sugai;I. Tamaki;Koji Takayama;H. Kato;H. Yoshimaru
中科院分区：
文献类型：
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作者：
S. Setsuko;Kyoko Sugai;I. Tamaki;Koji Takayama;H. Kato;H. Yoshimaru
小笠原露兜树（Pandanus boninensis）是日本小笠原群岛的特有种，分布于小笠原群岛的老小笠原岛和新小火山岛。在这项研究中，我们进行了种群遗传分析的P. boninensis在这些岛屿上，以检查人口的多样性和结构在老岛和年轻的岛屿，评估潜在的差异，人口统计与岛屿年龄，并收集任何证据之间的迁移老岛和年轻的岛屿。结果表明，幼岛的微卫星（SSR）标记的遗传多样性、核DNA序列的核苷酸多样性和叶绿体DNA单倍型多样性均低于老岛。EST-SSR的聚类分析表明，老岛屿上的种群与年轻岛屿上的种群有很大的差异。EST-SSR的近似贝叶斯计算分析表明，人口增长发生在老岛屿，而人口减少发生在年轻的岛屿。我们还发现了古老岛屿之间的移民证据（主要是从南到北），而古老岛屿和年轻岛屿之间的移民事件似乎很少。这些差异可能是由于年轻的岛屿在地理上往往是孤立的，并且支持较短时间前从有限的创始人开始的较小人口。从进化的角度来看，火山群岛上的P. boninensis种群是有趣的，因为它们构成了海洋岛屿上有效种群规模小和遗传多样性低的渐进殖民早期阶段的经典例子。
Pandanus boninensis, endemic to the Ogasawara Islands, Japan, is distributed on both the older Bonin and younger Volcano Islands. In this study, we conducted population genetic analyses of P. boninensis on these islands to examine the population diversity and structure across old and young islands, to assess potential differences in population demography with island age, and to collect any evidence of migration between old and young islands. We found that the genetic diversity of expressed sequence tag (EST)–based microsatellite (SSR) markers, the nucleotide diversity of nuclear DNA sequences, and the haplotype diversity of chloroplast DNA on young islands were lower than those on old islands. Clustering analyses of EST‐SSR indicated that populations on old islands were strongly diverged from those on young islands. Approximate Bayesian computation analysis of EST‐SSR suggested that population expansion occurred on old islands while population reduction occurred on young islands. We also found evidence of migration among old islands (mostly from south to north), while it appears that there have been very few migration events between old and young islands. These differences could be due to the fact that young islands tend to be geographically isolated and support smaller populations that began a shorter time ago from limited founders. The P. boninensis populations on the Volcano Islands are interesting from an evolutionary perspective as they constitute a classic example of the early stages of progressive colonization on oceanic islands with small effective population sizes and low genetic diversity.