文献类型：期刊文献

英文题名：Geographic variation in the structure of oak hybrid zones provides insights into the dynamics of speciation

作者：Zeng, Yan-Fei[1,2,3] Liao, Wan-Jin[1,2] Petit, Remy J.[4,5] Zhang, Da-Yong[1,2]

第一作者：Zeng, Yan-Fei;曾艳飞

通信作者：Zhang, DY[1]

机构：[1]Beijing Normal Univ, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China;[2]Beijing Normal Univ, MOE Key Lab Biodivers Sci & Ecol Engn, Beijing 100875, Peoples R China;[3]Chinese Acad Forestry, Res Inst Forestry, Key Lab Silviculture, State Forestry Adm, Beijing 100091, Peoples R China;[4]INRA, UMR Biodivers Genes & Ecosyst, F-33610 Cestas, France;[5]Univ Bordeaux, UMR Biodivers Genes & Ecosyst, F-33610 Cestas, France

年份：2011

卷号：20

期号：23

起止页码：4995-5011

外文期刊名：MOLECULAR ECOLOGY

收录：;Scopus(收录号：2-s2.0-81855201732);WOS:【SCI-EXPANDED(收录号:WOS:000297915700016)】；

基金：This work was financially supported by the National Natural Science Foundation of China (31121003) and the Fundamental Research Funds for the Central Universities of China (2009SC-4). We thank the editor and three anonymous reviewers for their helpful suggestions and valuable comments on the manuscript; Prof Xiao-Yong Chen for his helpful suggestions on discussion of phylogeography; Dr Lei Bao for helping with the ABI 3100 automated sequencer-related experiments; Dr Hong-Fang Wang for supplying the background maps of several figures; many people for helping with the sampling; and the Scientific Computing Center of BNU for supplying high-performance computing for our STRUCTURE analysis. RJP is indebted to the organizers of the Conference New Frontiers in Plant Systematics and Evolution (Beijing, 2010, July 7-9) and to Prof J. Liu from Lanzhou University for inviting him to China.

语种：英文

外文关键词：hybrid zone; introgression; molecular marker; population history; reinforcement; speciation

摘要：Studying geographic variation in the rate of hybridization between closely related species could provide a useful window on the evolution of reproductive isolation. Reinforcement theory predicts greater prezygotic isolation in areas of prolonged contact between recently diverged species than in areas of recent contact, which implies that old contact zones would be dominated by parental phenotypes with few hybrids (bimodal hybrid zones), whereas recent contact zones would be characterized by hybrid swarms (unimodal hybrid zones). Here, we investigate how the hybrid zones of two closely related Chinese oaks, Quercus mongolica and Q.similar to liaotungensis, are structured geographically using both nuclear and chloroplast markers. We found that populations of Q.similar to liaotungensis located around the Changbai Mountains in Northeast China, an inferred glacial refugium, were introgressed by genes from Q.similar to mongolica, suggesting historical contact between the two species in this region. However, these introgressed populations form sharp bimodal hybrid zones with Q.similar to mongolica. In contrast, populations of Q.similar to liaotungensis located in North China, which show no sign of ancient introgression with Q.similar to mongolica, form unimodal hybrid zones with Q.similar to mongolica. These results are consistent with the hypothesis that selection against hybrids has had sufficient time to reinforce the reproductive barriers between Q.similar to liaotungensis and Q.similar to mongolica in Northeast China but not in North China.