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Document Type

Greater Yellowstone Ecosystem Report

First Page

121

Last Page

122

Abstract

Population eruptions by native bark beetles are intermittent and can cause wide spread forest disturbance. The mountain pine beetle (MPB), Dendroctonus ponderosae Hopkins, is one such bark beetle currently affecting all species of pine in the Greater Yellowstone Ecosystem (GYE). MPB populations erupt after generating positive feedback once thresholds are surpassed. Population eruptions require a combination of factors such as favorable weather, tree susceptibility, and the reduced competitors and predators.

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