Species diversity and population density affect genetic structure and gene dispersal in a subtropical understory shrub
Species diversity and population density affect genetic structure and gene dispersal in a subtropical understory shrub
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DOI：
10.1093/jpe/rtr029
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发表时间：
2012-07
影响因子：
2.7
通讯作者：
Xueqin Zeng;S. Michalski;M. Fischer;W. Durka
中科院分区：
文献类型：
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作者：
Xueqin Zeng;S. Michalski;M. Fischer;W. Durka
目的花粉和种子的传播受空间限制，并可能因不同的生物相互作用、种群历史或非生物条件而在植物种群中发生变化。由于基因的传播受到空间的限制，它最终会导致空间遗传结构（SGS）的发展，这反过来又可以让我们深入了解基因的传播过程。本研究评估了种群密度和群落结构等生境特征对小尺度SGS的影响，并估算了不同空间尺度下的历史基因扩散。方法以12个亚热带灌木红荆（Ardisia crenata）居群为研究对象，分析了居群内和居群间7个微卫星位点的遗传变异。我们利用空间遗传自相关统计和异质性检验研究了小尺度遗传结构，并基于群体分化和群体内SGS估计了基因扩散距离。经多元回归分析，SGS与生境特征相关。
Aims The dispersal of pollen and seeds is spatially restricted and may vary among plant populations because of varying biotic interactions, population histories or abiotic conditions. Because gene dispersal is spatially restricted, it will eventually result in the development of spatial genetic structure (SGS), which in turn can allow insights into gene dispersal processes. Here, we assessed the effect of habitat characteristics like population density and community structure on small-scale SGS and estimate historical gene dispersal at different spatial scales. Methods In a set of 12 populations of the subtropical understory shrub Ardisia crenata, we assessed genetic variation at 7 microsatellite loci within and among populations. We investigated small-scale genetic structure with spatial genetic autocorrelation statistics and heterogeneity tests and estimated gene dispersal distances based on population differentiation and on within-population SGS. SGS was related to habitat characteristics by multiple regression.