Incomplete lineage sorting and introgression in the diversification of Chinese spot-billed ducks and mallards  

作　　者：Wenjuan WANG Yafang WANG Fumin Lei Yang LIU Haitao WANG Jiakuan Chen 

机构地区：[1]Jiangxi Province Key Laboratory of Watershed Ecosystem Change and Biodiversity,Center for Watershed Ecology,Institute of Life Science and School of Life Science,Nanchang University,Nanchang,China [2]lnstitute of Biodiversity Science,Fudan University,Shanghai,China [3]Key Laboratory of Poyang Lake Environment and Resource Utilization,Ministry of Education,Nanchang University,Nanchang,China [4]National Ecosystem Research Station of Jiangxi Poyang Lake Wetland,Nanchang,China [5]Key Laboratory of Zoological Systematics and Evolution,Institute of Zoology,Chinese Academy of Sciences,Beijing,China [6]State Key Laboratory of Biocontrol,Department of Ecology/School of Life Sciences,Sun Yat-sen University,Guangzhou,China [7]Jilin Provincial Engineering Laboratory of Avian Ecology and Conservation Genetics,School of Life Sciences,Northeast Normal University,Changchun,China

出　　处：《Current Zoology》2019年第5期589-597,共9页动物学报（英文版）

基　　金：the National Natural Science Foundation of China(No.31401969,31772480);the Natural Science Foundation of Jiangxi Province(No.20161BAB214158).

摘　　要：Incomplete lineage sorting and introgression are 2 major and nonexclusive causes of specieslevel non-monophyly.Distinguishing between these 2 processes is notoriously difficult because they can generate similar genetic signatures.Previous studies have suggested that 2 closely related duck species,the Chinese spot-billed duck Anas zonorhyncha and the mallard A.platyrhynchosvjere polyphyletically intermixed.Here,we utilized a wide geographical sampling,multilocus data and a coalescent-based model to revisit this system.Our study confirms the finding that Chinese spot-billed ducks and Mallards are not monophyletic.There was no apparent interspecific differentiation across loci except those at the mitochondrial DNA(mtDNA)control region and the Z chromosome(CHD1Z).Based on an isolation-with-migration model and the geographical distribution of lineages,we suggest that both introgression and incomplete lineage sorting might contribute to the observed non-monophyly of the 2 closely related duck species.The mtDNA introgression was asymmetric,with high gene flow from Chinese spot-billed ducks to Mallards and negligible gene flow in the opposite direction.Given that the 2 duck species are phenotypically distinctive but weakly genetically differentiated,future work based on genomescale data is necessary to uncover genomic regions that are involved in divergence,and this work may provide further insights into the evolutionary histories of the 2 species and other waterfowls.

关 键 词：asymmetric INTROGRESSION incomplete LINEAGE sorting non-monophyly the MALLARD complex Z chromosome 

分 类 号：F42[经济管理—产业经济]