Analysis of Cumulative Effects on Brown Bears on the Kenai Peninsula, Southcentral Alaska

January 1, 1998

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The approximately 280 brown bears (Ursus arctos) on the Kenai Peninsula, Alaska, are subjected to significant human impacts. A cumulative effects model was developed to evaluate the effects of several human actions on habitat capability for brown bear on the Chugach National Forest portion of the Kenai Peninsula. Changes in habitat quality for brown bears (habitat submodel) and reduced effectiveness of that habitat (human activities submodel) due to disturbance and mortality were evaluated. Habitat effectiveness was estimated to be reduced approximately 70% as a result of current human activities. Application of the model's results during land management planning will play a key role in avoiding future crisis management and in maintaining a viable population of brown bears on the Kenai Peninsula.

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