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32
信州大学農学部 AFC 報告 第19号 （2021）
Home range dynamics and utilization of agricultural crops in the first two years by
Asian black bear: case studies from two individuals
Akiko TAKII＊, Rumiko NAKASHITA＊＊ and Shigeyuki IZUMIYAMA＊
Shinshu University Institute of Mountain Science
Forestry and Forest Products Research Institute, Tsukuba
＊＊
Summary
To demonstrate the initiation of maize (Zea mays) consumption by Asian black bear (Ursus thibetanus),
we analyzed the seasonal home range and utilization of maize crop fields in the foothills of the Central
Japan Alps, using Global Positioning System (GPS) telemetry and carbon stable isotope analysis of U.
thibetanus hair samples. We tracked one female (AF) and one male (RM) black bear for 7 and 12 years,
respectively. Stable isotope analysis indicated neither AF nor RM consumed maize during the 2008‒2017
and 2011‒2018 periods, respectively. The spring and summer home range of these bears was in relatively
the same area throughout the survey period, and agricultural crop fields were not utilized during these
years. GPS telemetry revealed that AF and RM started to use agricultural crop fields in 2018 (16-year-old)
and 2019 (14-year-old), respectively. Both bears started to use crop fields from late August, and the use
terminated during early October. Both bears used only one crop field during the first year of maize
consumption, but RM used nine crop fields during the second year. Although both bears used crop fields
more frequently in the second year, the utilization period and daily duration time in the corn fields of RM
significantly increased during the second year. Our study revealed that bears change their food habits at
an older age, and such behavior may persist for years.
Key Words: agricultural crop, carbon stable isotope, conflict, Ursus thibetanus, Zea mays
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