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Effects of exploitation on black bear populations at white river national wildlife refuge

Journal of Wildlife Management

By:
, , and
DOI: 10.2193/2009-529

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Abstract

We live-trapped American black bears (Ursus americanus) and sampled DNA from hair at White River National Wildlife Refuge, Arkansas, USA, to estimate annual population size (N), growth (??), and density. We estimated N and ?? with open population models, based on live-trapping data collected from 1998 through 2006, and robust design models for genotyped hair samples collected from 2004 through 2007. Population growth was weakly negative (i.e., 95 CI included 1.0) for males (0.901, 95 CI 0.6451.156) and strongly negative (i.e., 95 CI excluded 1.0) for females (0.846, 95 CI 0.7110.981), based on live-trapping data, with N from 1999 to 2006 ranging from 94.1 (95 CI 70.3137.1) to 45.2 (95 CI 27.1109.3), respectively, for males and from 151.4 (95 CI 127.6185.8) to 47.1 (95 CI 24.4140.4), respectively, for females. Likewise, mean annual ?? based on hair-sampling data was weakly negative for males (0.742, 95 CI 0.0431.441) and strongly negative for females (0.782, 95 CI 0.6610.903), with abundance estimates from 2004 to 2007 ranging from 29.1 (95 CI 21.265.8) to 11.9 (95 CI 11.026.9), respectively, for males and from 54.4 (95 CI 44.377.1) to 27.4 (95 CI 24.936.6), respectively, for females. We attribute the decline in the number of females in this isolated population to a decrease in survival caused by a past translocation program and by hunting adjacent to the refuge. We suggest that managers restructure the quota-based harvest limits until these growth rates recover. ?? 2010 The Wildlife Society.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Effects of exploitation on black bear populations at white river national wildlife refuge
Series title:
Journal of Wildlife Management
DOI:
10.2193/2009-529
Volume
74
Issue:
7
Year Published:
2010
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Journal of Wildlife Management
First page:
1448
Last page:
1456