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Estimating Grizzly Bear Density in Relation to Development and Exploitation in Northwest Alaska

Estimating Grizzly Bear Density in Relation to Development and Exploitation in Northwest Alaska

Grizzly bear (Ursus arctos) densities within a 1,862 km2 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 km2 for adults (>3-years-old) and 1 bear/51 km2 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.

  • Author(s) Warren B. Ballard and Kathryn E. Roney and Lee Anne Ayres and Douglas N. Larsen
  • Volume 8
  • Issue
  • Pages 405-413
  • Publication Date 1 January 1990
  • DOI 10.2307/3872944
  • File Size 422.06 KB
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