GRIZZLY AND BLACK BEAR DENSITIES IN INTERIOR BRITISH COLUMBIA Submitted to: Canadian Forest Products Ltd. 5162 Northwood Pulpmill Road Box 9000, Prince George, BC, V2L 4W2 and B.C. Ministry of Water, Land, and Air Protection Fish and Wildlife Branch, Omineca Subregion 1011 4th Ave., Prince George, BC, V2L 3H9 Prepared by: G. Mowat1, K. G. Poole1, D. R. Seip2, D. C. Heard3, R. Smith4, and D. W. Paetkau5 1Aurora Wildlife Research RR 1, Site 14, Comp 8 Crescent Valley, BC, V0G 1H0 Tel: (250) 359-7699; e-mail:
[email protected] 2British Columbia Ministry of Forests, Prince George, BC 3British Columbia Ministry of Water, Land, and Air Protection, Prince George, BC 4Lheidli T’enneh Band, Prince George, BC 5Wildlife Genetics International, Nelson, BC for: Forest Renewal British Columbia Workplan No. OPM 01103, Activity No. 720869 and Common Land Information Base Project No. CLB01029 January 2002 Bear densities in interior British Columbia ii ABSTRACT We used genetic identification of individuals and mark-recapture modeling to estimate bear (Ursus) population size in both a mountainous and interior plateau environment in central eastern British Columbia. We sampled 591 sites within a 9,452-km2 study area during June and July 2000 and detected grizzly bears (Ursus arctos) at 199 sites and black bears (U. americanus) at 316 sites. We identified 326 different grizzly bears using microsatellite profiling; there were more females than males in the sample (35M:65F). After correcting for the effects of closure bias, we estimated density to be 12 grizzly bears/1,000 km2 (95% confidence interval [CI] 7–28) on the plateau and 49/1,000 km2 (CI 43–59) in the mountains.