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Prospects for Yellowstone grizzly bears

Bears: Their Biology and Management
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Abstract

Recent analyses of data on the grizzly bear (Ursus arctos horribilis) population of Yellowstone National Park and its environs suggest the likelihood of a continuing decline in numbers if losses of fully adult females are not reduced. The size of the population is not known, and a simple projection model has been used to identify some inconsistencies in the available index data. Population dynamics calculations, based on Lotka's equation or a stochastic model, indicate a continuing decrease in numbers, although continued observations through radio-telemetry are needed to verify these trends. The margin between stabilizing the population and a continued decrease appears to be roughly the loss of 2 fully adult female bears per year. At present, the risk of extirpation of this population over the next 30 years appears to be small. Continued monitoring of survivorship will be needed, particularly because "recovery" of the population may be mainly characterized by a shift in the pattern of mortality, from adults to subadults, and not necessarily a reduction in absolute number of losses.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Prospects for Yellowstone grizzly bears
Series title Bears: Their Biology and Management
Volume 7
Year Published 1987
Language English
Publisher JSTOR,
Publisher location New York, NY
Description 6 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Bears: Their Biology and Management
First page 45
Last page 50
Country United States
State Idaho;Montana;Wyoming
Other Geospatial Yellowstone National Park
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