A Note on Daily Movement Patterns of a Female Asiatic Black Bear (Ursus thibetanus) in a Suburban Area of Iwate Prefecture, Northeastern Japan

摘要

As urban areas sprawl and natural environments are modified, human-bear conflicts are becoming increasingly more common and significant management concernsthroughout the United States (Peine 2001; Beckmann and Lackey 2008) and other countries (Mattson 1990; Huygens et al. 2004; Sangay and Vernes 2008). In North America, nuisance activities by American black bears (Ursus americanus) include raiding crops and orchards, feeding on human food and garbage, and attacking livestock and humans (Herrero 2002). However, management policies for black bears vary according to the status of the species, which ranges from pest to threatened (Pelton 2003). American black bears are generally crepuscular but may shift to diurnal or nocturnal activities depending on human activity (Pelton 2003). Several studies havereported such behavioral changes of black bears in British Columbia (Reimchen 1998), Nevada (Beckmann and Berger 2003), and California (Ayres et al. 1986; Lyons2005; Matthews et al. 2006). Recently, crop damage and human injuries have also been caused by Asiatic black bears (U.thibetanus) in Japan (Hazumi 1994). Most of these disturbances occur in suburban landscapes surrounded by forests and farmlands with obscure boundaries (Ozaki and Kudo 2002).In Japan, only a few behavioral studies have addressed such problems with black bears. In Nagano Prefecture, central Japan, Huygens and Hayashi (1999) constructed an electric fence around corn fields to test its effect on crop depredation by black bears. In the Experimental Farm of Tohoku University, northeastern Japan, Deguchi et al. (2003) placed infrared cameras near a corn field toobserve nuisance behavior by black bears. Despite these studies, little is known of the movement patterns of Asiatic black bears in suburban areas of Japan. Detailed monitoring of active Asiatic black bearsnear suburban areas is required to reduce human-bear interactions. Therefore, to characterize bear movement and resource selection patterns during the crop harvestseason, we monitored the movement of a female Asiatic black bear, which was tagged in a forest adjacent to a suburban area, using global positioning system (GPS)technology.