Mitogenomics clarifes the position of the Nearctic magpies (Pica hudsonia and Pica nuttalli) within the Holarctic magpie radiation  

作　　者：Alexey P.Kryukov Kirill A.Kryukov Kathleen Collier Bohao Fang Scott V.Edwards 

机构地区：[1]Laboratory of Evolutionary Zoology and Genetics,Federal Scientifc Center of the East Asia Terrestrial Biodiversity,Russian Academy of Sciences,Vladivostok 690022,Russia [2]Center for Genome Informatics,Bioinformation and DDBJ Center,National Institute of Genetics,1111 Yata,Mishima 411-8540,Japan [3]University of Alaska Museum of the North,University of Alaska,Fairbanks,AK 99775,USA [4]Department of Organismic and Evolutionary Biology and Museum of Comparative Zoology,Harvard University,Cambridge,MA 02138,USA

出　　处：《Current Zoology》2024年第5期618-630,共13页动物学报（英文版）

基　　金：supported by a grant from the Harvard Global Institute for research on biodiversity of China;The research was carried out within the state assignment of Ministry of Science and Higher Education of the Russian Federation(theme No.121031500274-4)。

摘　　要：Partial separation of a peripheral population may lead to its divergence and,potentially,speciation due to genetic drift followed by selection and geographic isolation.This process may cause taxonomic uncertainty because reproductive isolation in allopatry cannot be verifed directly.The two Nearctic allopatric species of magpies(Aves,Corvidae:Pica)serve as a good example of these problems.The Black-billed magpie Pica hudsonia is widely distributed in North America,whereas the Yellow-billed Magpie Pica nuttalli is endemic to a restricted range in California.Their relationships with Palearctic species have been little studied.We obtained complete mitochondrial genomes of both Nearctic magpie species,along with the Eurasian Magpie(Pica pica)and the Oriental Magpie(Pica serica),20 mitogenomes in total.Phylogenetic analysis reveals a basal position of P.serica,and P.pica as a sister clade to the two Nearctic species.P.hudsonia and P.nuttalli form reciprocal monophyletic subclades,showing recent divergence between and within them.Our data show that the Nearctic magpie lineage diverged from the common ancestor with P.pica,with a single migration wave via the Beringia.Within the Nearctic,we hypothesize a peripatric mode of speciation among Pica taxa due to the divergence and separation of the small marginal population in California below the Sierra-Nevada mountains.Diversifying amino acid substitutions in ND4-ND5-ND6 genes along the branch leading to the New World clade may indicate selection for heat-tolerance.Considering the clear phenotypic differences between P.hudsonia and P.nuttalli,our data,showing their reciprocal monophylies and genetic distinctness,is consistent with the two-species taxonomy.

关 键 词：Corvidae mitochondrial genome peripatric speciation reciprocal monophyly Sierra Nevada biogeographic barrier 

分 类 号：Q95[生物学—动物学]