文献类型：期刊文献

英文题名：Geographic distance, landscape heterogeneity and migratory connectivity influence population genetic structure of farmland-dependent wintering birds and their conservation

作者：Liu, Gang[1,2] Li, Chao[1] Kessler, Mimi[2,3] Flatz, Ramona[4] Meng, Derong[5] Wei, Ming[6] Gong, Minghao[1]

第一作者：刘刚;Liu, Gang

通信作者：Liu, G[1];Gong, MH[1]

机构：[1]Chinese Acad Forestry, Inst Wetland Res, Beijing Key Lab Wetland Serv & Restorat, Beijing 100091, Peoples R China;[2]IUCN SSC Bustard Specialist Grp, Cambridge CB2 3QZ, England;[3]Eurasian Bustard Alliance, POB 2705, Jackson, WY 83001 USA;[4]Willamette Univ, 900 State St, Salem, OR 97301 USA;[5]Cangzhou Normal Coll, Hebei 061000, Peoples R China;[6]China Birdwatching Assoc, Kunming 650051, Peoples R China

年份：2022

卷号：272

外文期刊名：BIOLOGICAL CONSERVATION

收录：;Scopus(收录号：2-s2.0-85133968004);WOS:【SCI-EXPANDED(收录号:WOS:000823090300007)】；

基金：Funding This research was supported by the National Natural Science Foun-dation of China (No. 3217030476) , and also funded by National Natural Science Foundation Youth Fund (No. 31500303) .

语种：英文

外文关键词：Landscape composition; Genetic structure; Migratory connectivity; Farmland bird; Wintering

摘要：Understanding the drivers of population structure is a conservation priority for declining species. However, the relative extent to which landscape features in wintering areas and migration route drive population genetic structure for birds is still unclear. The eastern great bustard (Otis tarda dybowskii) is an endangered and declining steppe bird which is heavily dependent on farmland for overwintering. We used noninvasive fecal sampling and molecular genetics to quantify genetic diversity and explore the extent of genetic differentiation among 145 individuals from 7 wintering populations across this subspecies' non-breeding distribution. Genetic analyses revealed low to moderate but significant genetic differentiation, showing three genetic clusters consistent with three migration routes. Landscape genetic analysis based on variance partitioning revealed that 67.4 % of the observed genetic variability was explained through isolation by distance (IBD), and in contrast, 56.5 % was explained by landscape heterogeneity. The low level of genetic diversity and significant population differentiation we discovered, combined with small population size, put the eastern great bustard at risk of inbreeding depression. Our results strengthen evidence for strong migratory connectivity in this subspecies, with significant genetic clustering correlated to known migration routes. The construction of secure nature reserves and improvement of wintering habitats can help to reduce threats on the wintering grounds, and thus associated demographic impacts on tightly connected breeding populations.