Key Laboratory of Bio-Source and Environmental Conservation, School of Life Science, Sichuan University 6100061, Chengdu, Sichuan, China ; Umeå Plant Science Centre, Department of Ecology and Environmental Science, Umeå University SE-90187, Umeå, Sweden.
School of Biology, Mitchell Building, University of St Andrews St Andrews, Fife KY16 9TH, UK.
Ecol Evol. 2014 Apr;4(7):1019-29. doi: 10.1002/ece3.1007. Epub 2014 Mar 3.
Because of introgressive hybridization, closely related species can be more similar to each other in areas of range overlap (parapatry or sympatry) than in areas where they are geographically isolated from each other (allopatry). Here, we report the reverse situation based on nuclear genetic divergence between two fir species, Abies chensiensis and Abies fargesii, in China, at sites where they are parapatric relative to where they are allopatric. We examined genetic divergence across 126 amplified fragment length polymorphism (AFLP) markers in a set of 172 individuals sampled from both allopatric and parapatric populations of the two species. Our analyses demonstrated that AFLP divergence was much greater between the species when comparisons were made between parapatric populations than between allopatric populations. We suggest that selection in parapatry may have largely contributed to this increased divergence.
由于渗入杂交，在地理上相互隔离的区域（异域分布），亲缘关系密切的物种彼此之间的相似性可能不如分布区域重叠（同域分布或邻域分布）的区域。在这里，我们报告了一种基于中国两种冷杉（Abies chensiensis 和 Abies fargesii）核遗传差异的相反情况，在这些地方，它们相对于异域分布是邻域分布。我们在 172 个个体的一组中，使用 126 个扩增片段长度多态性（AFLP）标记，对两种物种的同域和邻域种群进行了遗传差异分析。我们的分析表明，当比较邻域种群时，AFLP 差异明显大于比较异域种群时的差异。我们认为，邻域选择可能在很大程度上促成了这种差异的增加。
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