Old divergences in a boreal bird supports long-term survival through the Ice Ages.

BMC Evolutionary Biology
Takema SaitohKeisuke Ueda

Abstract

Unlike northern Europe and most of northern North America, the Eastern Palearctic and the northwesternmost tip of North America are believed to have been almost unglaciated during the Quarternary glacial periods. This could have facilitated long-term survival of many organisms in that area. To evaluate this, we studied the phylogeography in east Asia and Alaska of a boreal migratory passerine bird, the Arctic Warbler Phylloscopus borealis, and compared our results with published data on especially North American species. In a sample of 113 individuals from 18 populations we identified 42 haplotypes of the mitochondrial cytochrome b gene, which separated into three clades: A--Alaska and mainland Eurasia (except Kamchatka); B--Kamchatka, Sakhalin and Hokkaido; and C--Honshu, Shikoku and Kyushu (i.e. Japan except Hokkaido). The oldest split among these clades, between A/B and C, is estimated to have taken place sometime between the mid Pliocene and early Pleistocene, and the second divergence, between clades A and B, in the early to mid Pleistocene. Within all of the three main clades, there are signs of population expansion. The Arctic Warbler separated into three main clades in close succession around the Pliocene/Pleistocene bo...Continue Reading

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Citations

Sep 8, 2012·Frontiers in Zoology·Thomas Schmitt, Zoltán Varga
Sep 23, 2014·Journal of Evolutionary Biology·J SwaegersR Stoks
Nov 23, 2017·Mitochondrial DNA. Part A. DNA Mapping, Sequencing, and Analysis·Anna O Zolotova, Yuri Ph Kartavtsev
Jan 11, 2020·Science·Frank E RheindtNathaniel S R Ng

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