Density and population size estimates for North Cascade grizzly bears using DNA hair-sampling techniques

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• 作者：Romain-Bondi ; Kimberly A. ; Wielgus ; Robert B. ; Waits ; Lisette ; Kasworm ; Wayne F. ; Austin ; Matt ; et. al.
• 关键词：Grizzly bear ; DNA hair-sampling ; Catch per unit effort ; Small population ; North Cascade Ecosystem
• 刊名：Biological Conservation
• 出版年：2004
• 期刊代码：13_00063207
• 类别：env
• 出版时间：June, 2004
• 卷：117
• 期：4
• 页码：417-428
• 文件大小：378 K

摘要

We used non-invasive DNA hair-sampling and catch per unit effort (CPUE: grizzly bears detected per 1000 trap nights) to estimate relative density and population size for a threatened grizzly bear population in the North Cascade Ecosystem of Washington and British Columbia. We used linear, logistic, and linear through the origin regression analyses to estimate the relationship between catch per unit effort and grizzly bear density for seven other grizzly populations. One grizzly bear was detected during 5304 trap nights (CPUE=0.19) over 3 years in the North Cascades. This CPUE was much lower than in the other seven populations, including two threatened grizzly populations in the Cabinet-Yaak and Selkirk Mountain Ecosystems. The logistic model (curvilinear relationship) best fit the data (R²