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Demographic History of the Brown Bear (Ursus arctos) on Hokkaido Island, Japan, Based on Whole-Genomic Sequence Analysis

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Title: Demographic History of the Brown Bear (Ursus arctos) on Hokkaido Island, Japan, Based on Whole-Genomic Sequence Analysis
Authors: Endo, Yu Browse this author
Osada, Naoki Browse this author
Mano, Tsutomu Browse this author
Masuda, Ryuichi Browse this author →KAKEN DB
Keywords: admixture
isolation by distance
Issue Date: Sep-2021
Publisher: Oxford University Press
Journal Title: Genome biology and evolution
Volume: 13
Issue: 9
Start Page: evab195
Publisher DOI: 10.1093/gbe/evab195
Abstract: Previous studies of the brown bear (Ursus arctos) on Hokkaido Island, Japan, have detected three geographically distinct subpopulations representing different mitochondrial lineages and shown that gene flow between subpopulations has occurred due to male biased dispersal. In this study, we determined whole-genomic sequences for six Hokkaido brown bears and analyzed these data along with previously published genomic sequences of 17 brown bears from other parts of the world. We found that the Hokkaido population is genetically distinct from the other populations, keeping genetic diversity higher than the endangered populations in western Europe but lower than most populations on the continents. A reconstruction of historical demography showed no increase in population size for the Hokkaido population during the Eemian interglacial period (130,000-114,000 years ago). In a phylogenetic analysis of the autosomal data, the Hokkaido population formed a Glade distinct from North American and European populations, showing that it has maintained genetic diversity independently from continental populations following geographical isolation on the island. This autosomal genetic similarity contrasts with the geographically separate mitochondrial lineages on Hokkaido and indicates the occurrence of male -driven gene flow between subpopulations.
Type: article
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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