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1 March 2011 Variation in Maize Consumption by Brown Bears (Ursus arctos) in Two Coastal Areas of Hokkaido, Japan
Ryo Narita, Tsutom Mano, Reo Yokoyama, Atsushi Takayanagi
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Abstract

We measured carbon and nitrogen stable-isotope ratios in the livers of 130 brown bears (Ursus arctos) killed by hunters in two coastal areas of Hokkaido, Japan, from 2003 to 2004 to analyze the diets of individual bears, particularly maize. In both study areas, bears suspected of damaging maize, whose diets were higher in the C4 plant component, were mainly observed during late summer and autumn. Wide variation in the C4 plant component indicated that individual bears have differing degrees of dependence on maize, suggesting differential foraging behavior among the individual bears. We found that a stable-isotope ratio analysis of individual Hokkaido brown bears can serve as a tool to review the effectiveness of control killing and to monitor trends in maize consumption by local populations of bears.

© the Mammalogical Society of Japan
Ryo Narita, Tsutom Mano, Reo Yokoyama, and Atsushi Takayanagi "Variation in Maize Consumption by Brown Bears (Ursus arctos) in Two Coastal Areas of Hokkaido, Japan," Mammal Study 36(1), 33-39, (1 March 2011). https://doi.org/10.3106/041.036.0104
Received: 29 January 2009; Accepted: 1 November 2010; Published: 1 March 2011
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