Estimating grizzly bear density in relation to development and exploitation in northwest Alaska

Publication Type:Journal Article
Year of Publication:1990
Authors:Ballard, WB, Roney, KE, Ayres, L, Larsen, DNAnne
Journal:International Conference on Bear Research and Management
Volume:8
Pagination:405-413
Date Published:1990
Keywords:Ursus arctos
Abstract:

Grizzly bear (Ursus arctos) densities within a 1,862 kmÇ‚ß study area surrounding a lead/zinc mine in northwest Alaska were estimated using mark-recapture methods during late May and early June 1987. Radio collars were used to mark bears and assess population closure. Density estimates were 1 bear/66 kmÇ‚ß for adults (>3-years-old) and 1 bear/51 kmÇ‚ß for bears of all ages. Some of the biases and problems associated with the mark-recapture method were discussed. Density estimates were used to estimate population size within and near the bear study area, and this estimate was compared with reported and suspected annual harvests. Estimated annual harvest rates in recent years ranged from 8 to 16%. Current bear density and population estimates will be compared with estimates obtained after the mine is developed to assess impacts on the bear population.

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