Impacts of late Quaternary environmental change on the long-tailed ground squirrel(Urocitellus undulatus)in Mongolia

查看全文 作　　者：Bryan [1]S.McLean;Batsaikhan [2]Nyamsuren;ANDrey [3]Tchabovsky;Joseph [4]A.Cook 机构地区：[1]University of Florida, Florida Museum of Natural History;[2]Department of Biology, School of Arts and Sciences, National University of Mongolia;[3]Laboratory of Population Ecology, A.N. Severtsov Institute of Ecology and Evolution;[4]University of New Mexico, Department of Biology and Museum of Southwestern Biology 出　　处：《Zoological Research》索引2018年第39卷第5期,共9页 基　　金：funded primarily by grants from the National Science Foundation(USA;DBI-9411976 supplement(1999),DEB-0717214(2009-2012),DEB-1258010(2015-2016));B.S.M. was partially supported by a Peter Buck Predoctoral Fellowship during the 2015 Mongolian expedition;supported by the National Science Foundation(DEB-1258010);the American Society of Mammalogists(ASM Fellowship to B.S.M.) 摘　　要：Impacts of Quaternary environmental changes on mammal faunas of central Asia remain poorly understood due to a lack of comprehensive phylogeographic sampling for most species. To help address this knowledge gap, we conducted the most extensive molecular analysis to date of the long-tailed ground squirrel(Urocitellus undulatus Pallas 1778) in Mongolia, a country that comprises the southern core of this species' range. Drawing on material from recent collaborative field expeditions,we genotyped 128 individuals at two mitochondrial genes(cytochrome b and cytochrome oxidase I;1 797 bp total). Phylogenetic inference supports the existence of two deeply divergent infraspecific lineages(corresponding to subspecies U. u. undulatus and U. u. eversmanni), a result in agreement with previous molecular investigations but discordant with patterns of range-wide craniometric and external phenotypic variation. In the widespread western eversmanni lineage, we recovered geographical y-associated clades from the:(a) Khangai,(b) Mongolian Altai, and(c) Govi Altai mountain ranges. Phylogeographic structure in U. u. eversmanni is consistent with an isolation-by-distance model; however, genetic distances are significantly lower than among subspecies, and intra-clade relationships are largely unresolved. The latter patterns, as wel as the relatively higher nucleotide polymorphism of populations from the Great Lakes Depression of northwestern Mongolia, suggest a history of range shifts into these lowland areas in response to Pleistocene glaciation and environmental change,followed by upslope movements and mitochondrial lineage sorting with Holocene aridification. Our study illuminates possible historical mechanisms responsible for U. undulatus genetic structure and contributes to a framework for ongoing exploration of mammalian response to past and present climate change in central Asia. 关 键 词：环境变化 松鼠 地面 尾巴 蒙古 四级 哺乳动物 动物志