Demographic history of a common pioneer tree, Zanthoxylum ailanthoides, reconstructed using isolation-with-migration model.
Demographic history of a common pioneer tree, Zanthoxylum ailanthoides, reconstructed using isolation-with-migration model.
复制标题
使用隔离与迁移模型重建常见先锋树花椒的人口统计历史。
DOI：
10.1007/s11295-014-0755-8
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发表时间：
2014
影响因子：
2.4
通讯作者：
Tachida H.
中科院分区：
文献类型：
--
作者：
Yoshida T;Tamekuni M;Yahara T;Inomata;Tachida H.
花椒、花椒、花椒和花椒。(Rutaceae)，是生长在日本暖温带常绿栎林树冠空隙等干扰地区的最常见的先锋树种之一。其当前种群的强大遗传结构可能表明，除了该物种的生态特征外，亚种群的长期隔离也受到人口统计事件的影响。使用基于模型的方法对全基因组核苷酸变异进行分析对于更好地理解物种的人口历史是必要的。在这项研究中，我们分析了Z在自然种群中的核苷酸变异。使用计算机程序对人口历史进行定量推断，该程序应用了隔离-迁徙模型。分析了不同物种分布的6个群体在10个或26个核基因座上的核苷酸变异。Z的两个假设避难所中当前种群之间分歧时间的最大似然估计。大约24,000年前。出乎意料的是，祖先种群的估计规模超过了目前两个种群的规模。结果表明，这两个种群之间存在较新的分化，亚种群间迅速形成了较强的遗传结构。庞大的祖先人口可能表明，在最后一次冰川时期或之后，与简单的与世隔绝和迁徙模式所暗示的相比，人口历史更加复杂。
The Japanese prickly ash,Zanthoxylum ailanthoidesSiebold & Zucc. (Rutaceae), is one of the most common pioneer tree species that grow in disturbed areas, such as canopy gaps, in Japanese warm-temperate evergreen oak forests. The strong genetic structure of its current population might suggest long-term isolation of subpopulations by demographic events, in addition to ecological features of this species. Analyses of genome-wide nucleotide variation using model-based approaches are necessary to achieve a good understanding of the demographic history of a species. In this study, we analyzed the nucleotide variation in natural populations ofZ. ailanthoidesusing a computer program that applied the isolation-with-migration model to quantitatively infer the demographic history. Nucleotide variations at 10 or 26 nuclear loci in six populations from a wide range of the species distribution were analyzed. The maximum likelihood estimate of the divergence time between the current populations in the two hypothetical refugia ofZ. ailanthoideswas approximately 24,000 years. Unexpectedly, the estimated size of the ancestral population was larger than the sizes of the two current populations. The results suggested a relatively recent divergence of these two populations and rapid formation of strong genetic structure among subpopulations. The large ancestral population may indicate a more complex demographic history during or after the last glacial period than the simple isolation-with-migration model implies.