Spatial patterns of genetic variation generated by different forms of dispersal during range expansion
Spatial patterns of genetic variation generated by different forms of dispersal during range expansion
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DOI：
10.1038/hdy.1996.142
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发表时间：
1996-09-01
期刊：
影响因子：
3.8
通讯作者：
Hewitt, GM
中科院分区：
文献类型：
--
作者：
Ibrahim, KM;Nichols, RA;Hewitt, GM
我们研究了三种形式的扩散，踏脚石，正常和leptokurtic，扩大人口的空间遗传结构，利用计算机模拟的影响。当扩散到邻近的族群是允许的，罕见的长距离迁移导致口袋人口的建立在主入侵前，并导致基因型的空间聚类，持续数百代。在许多动植物物种中，当扩散呈尖峰形时，斑块更为明显。这些结果是特别感兴趣的，因为人口的遗传参数，如基因流和有效的人口规模通常估计使用基因频率发散信息假设平衡条件和岛屿模型。我们展示了在殖民过程中的三种形式的传播带来了对比种群遗传结构，以及这如何影响基因流的估计。种群遗传结构的空间维度的实验研究的影响进行了讨论。
We examined the impact of three forms of dispersal, stepping-stone, normal and leptokurtic, on spatial genetic structure of expanding populations using computer simulations. When dispersal beyond neighbouring demes is allowed, rare long-distance migration leads to the establishment of pocket populations in advance of the main invasion front and results in spatial clustering of genotypes which persists for hundreds of generations. Patchiness is more pronounced when dispersal is leptokurtic as is the case in many animal and plant species. These results are of particular interest because population genetic parameters such as gene flow and effective population size are commonly estimated using gene frequency divergence information assuming equilibrium conditions and island models. We show how the three forms of dispersal during colonization bring about contrasting population genetic structures and how this affects estimates of gene flow. The implications for experimental studies of the spatial dimension of population genetic structure are discussed.