2019年7月
Sex-biased dispersal and inbreeding avoidance in Hokkaido brown bears
JOURNAL OF MAMMALOGY
- 巻
- 100
- 号
- 4
- 開始ページ
- 1317
- 終了ページ
- 1326
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1093/jmammal/gyz097
- 出版者・発行元
- OXFORD UNIV PRESS INC
Natal dispersal likely plays an important role in avoiding inbreeding among large carnivores. We tested the hypothesis that male-biased dispersal reduces close inbreeding by limiting the spatial overlap of opposite-sex pairs of close relatives in brown bears (Ursus arctos) in the Shiretoko Peninsula, Hokkaido, Japan. We genotyped 837 individuals collected in 1998-2017 at 21 microsatellite loci and performed parentage analysis. To calculate natal dispersal distance, we considered the site where the mother was identified as the birthplace of her offspring, and the site where the offspring were identified as their dispersed place. As predicted, we found that dispersal distances were significantly greater for males (12.4 km +/- 1.0) than for females (7.7 km +/- 0.9), and those for males increased from 3 years old, indicating that males begin to disperse around the time sexual maturation begins. Relatedness decreased with distance among pairs of females, and the mean relatedness was significantly higher between pairs of females than between pairs of males or between female-male pairs within 3 km. Closely related female-male pairs rarely (5-6%) resided in close proximity (< 3 km), compared with pairs of closely related females. Our study revealed that the potential for close inbreeding was low in Hokkaido brown bears because males are effective dispersers.
- リンク情報
- ID情報
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- DOI : 10.1093/jmammal/gyz097
- ISSN : 0022-2372
- eISSN : 1545-1542
- Web of Science ID : WOS:000478041600021