Picchio Wildlife Research Center

Nagano-shi, Japan

Picchio Wildlife Research Center

Nagano-shi, Japan
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Yamamoto T.,Nippon Veterinary and Life Science University | Tamatani H.,Picchio Wildlife Research Center | Tanaka J.,Picchio Wildlife Research Center | Kamiike K.,Picchio Wildlife Research Center | And 3 more authors.
Mammalia | Year: 2013

We performed microsatellite paternity analyses of two Asian black bear Ursus thibetanus littermates with a known mother. Using Cervus 3.0, we identified the probable father among 17 candidate fathers for Cub 1, but failed to identify a probable father for Cub 2. Cub 1 and her probable father shared at least one allele at all 13 loci. In contrast, Cub 2 and the probable father of Cub 1 had mismatching alleles at eight loci, indicating that the two cubs are offspring of different fathers. This is probably the first evidence for multiple paternity in Asian black bears.


Yamamoto T.,Nippon Veterinary and Life Science University | Tamatani H.,Picchio Wildlife Research Center | Tanaka J.,Picchio Wildlife Research Center | Yokoyama S.,Picchio Wildlife Research Center | And 6 more authors.
Ursus | Year: 2012

We characterized annual and seasonal home ranges (HR) of 27 female Asiatic black bears (Ursus thibetanus) during 2003-11 in Karuizawa, Nagano Prefecture, Japan. Mean annual HR size for bears calculated by the 95% fixed kernel method was 10.0 km2 (SD = 8.5) and differed depending on the year. However, annual HR sizes were not affected by reproductive status (with or without cubs) or age (subadult or adult). Home ranges tended to be larger in summer than in autumn. We speculate that a contributing factor to differences in HR size was annual or seasonal fluctuation of food resources. Annual shifts in HR centers and HR overlaps were estimated to be 1.2 km (SD = 0.9) and 0.55 km (SD = 0.13), respectively. Seasonal shifts in HR centers and seasonal overlaps were 1.1 km (SD = 1.1) and 0.54 km (SD = 0.12), respectively. Together, these results suggest that female Asiatic black bears in our study area do not migrate long distances seasonally or annually. © 2012 International Association for Bear Research and Management.


Yamamoto T.,Nippon Veterinary and Life Science University | Tamatani H.,Picchio Wildlife Research Center | Tanaka J.,Picchio Wildlife Research Center | Oshima G.,Picchio Wildlife Research Center | And 2 more authors.
Journal of Mammalogy | Year: 2016

For bears, numerous associations between biotic and abiotic factors have been reported to correlate with the timing of den entry and emergence; however, an analysis showing which factors influence the timing of den entry and emergence has not been performed enough. In this study, a generalized linear mixed model was generated using 66 entry dates for 26 females and 40 entry dates for 26 males, and 56 emergence dates for 26 females and 25 emergence dates for 18 males between 1999 and 2012. Regarding factors for den entry, the average temperature in November and mast production of Mongolian oaks were significant for both males and females. For the date of den emergence, the average temperature in March affected strongly. For males, good mast production of Mongolian oaks in the previous year was found to be associated with early den emergence. For females, the presence of newborns had a significant influence on their den entry and emergence. This study indicated that denning behavior appears to be regulated by several abiotic and biotic factors and regulation factors are sex specific. © 2015 American Society of Mammalogists, www.mammalogy.org.

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