Effect of overabundant of sika deer on the Asiatic black bear

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I compared the food habits of Asiatic black bears (Ursus thibetanus) from before (-1990) and after (2001-) 2000 using both fecal contents and carbon and nitrogen stable isotope ratios in bear hairs. The bear population’s diet changed over 2 decades. Habitat conditions may have changed, causing bears to adjust their food habits. We discuss some factors, such as vegetation changes caused by overabundant deer or bears eating deer carcasses, that may be partly responsible.