生物
溯祖理论
异域物种形成
瘢痕性形态
渗入
进化生物学
人口
谱系(遗传)
人口历史
遗传变异
基因流
遗传学
系统发育学
基因
社会学
人口学
作者
Yongfeng Zhou,Ludovic Duvaux,Guangpeng Ren,L Zhang,Outi Savolainen,Jianquan Liu
出处
期刊:Heredity
[Springer Nature]
日期:2016-09-21
卷期号:118 (3): 211-220
被引量:78
摘要
Genetic variation shared between closely related species may be due to retention of ancestral polymorphisms because of incomplete lineage sorting (ILS) and/or introgression following secondary contact. It is challenging to distinguish ILS and introgression because they generate similar patterns of shared genetic diversity, but this is nonetheless essential for inferring accurately the history of species with overlapping distributions. To address this issue, we sequenced 33 independent intron loci across the genome of two closely related pine species (Pinus massoniana Lamb. and Pinus hwangshanensis Hisa) from Southeast China. Population structure analyses revealed that the species showed slightly more admixture in parapatric populations than in allopatric populations. Levels of interspecific differentiation were lower in parapatry than in allopatry. Approximate Bayesian computation suggested that the most likely speciation scenario explaining this pattern was a long period of isolation followed by a secondary contact. Ecological niche modeling suggested that a gradual range expansion of P. hwangshanensis during the Pleistocene climatic oscillations could have been the cause of the overlap. Our study therefore suggests that secondary introgression, rather than ILS, explains most of the shared nuclear genomic variation between these two species and demonstrates the complementarity of population genetics and ecological niche modeling in understanding gene flow history. Finally, we discuss the importance of contrasting results from markers with different dynamics of migration, namely nuclear, chloroplast and mitochondrial DNA.
科研通智能强力驱动
Strongly Powered by AbleSci AI