2026-08-04 筑波大学
＜関連情報＞
- https://www.tsukuba.ac.jp/journal/biology-environment/20260804141500.html
- https://bioone.org/journals/mammal-study/volume-51/issue-2/ms2025-0029/Local-Genetic-Diversity-and-Structure-of-Asian-Black-Bear-Ursus/10.3106/ms2025-0029.full
長野県に生息するツキノワグマUrsus thibetanus 集団の地域的な遺伝的多様性と遺伝構造 Local Genetic Diversity and Structure of Asian Black Bear, Ursus thibetanus, Populations in Nagano, Japan
Ririko Koido, Masayuki Yagyu, Asuka Miyazawa, Naoki Ohnishi, Misako Kuroe, Yoshiaki Tsuda
Mammal Study Published:25 March 2026
DOI:https://doi.org/10.3106/ms2025-0029
Abstract
Human–bear conflict is a significant issue in Japan. Understanding genetic diversity, population structure, and local population size of the Asian black bear is essential for improving ecological knowledge and developing conservation and management measures of this species. We examined sex, mitochondrial (mt) DNA variations, and 12 nuclear microsatellite genotypes from hair-derived DNA collected in the Kiso region, Nagano Prefecture. After verifying microsatellite genotypes, we identified 30 distinct individuals (six males, 18 females) within an approximately 48 km2 area. MtDNA analysis revealed that all males shared haplotype E01, while females possessed three haplotypes, including E07, detected in Nagano for the first time but previously reported in Tohoku region and Toyama Prefecture. STRUCTURE analysis did not reveal any genetic cluster in nuclear DNA, but significant spatial genetic structures were identified in both mtDNA and nuclear DNA. No evidence of a recent bottleneck was detected. This study is the first to examine the local genetic structure of the black bear in Nagano. Although no genetic clusters were detected, the estimated effective population size was not large, underscoring the importance of continued genetic monitoring. These findings provide insights into anticipating potential conflict zones and guiding conservation and management measures in the Kiso region.
