Prospects for Yellowstone grizzlies
Recent analyses of data on the grizzly 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. Current size of the population is not known, but a simple projection model has been used to identify some inconsistencies in the index data. Population dynamics calculations, based on Lotka's equation or a stochastic model, indicate a continuing decrease in numbers. The margin between stabilization of the population and a continued decrease appears to be roughly the loss of one fully adult female bear per year. At present, the risk of extirpation over the next 30 years appears to be small. Continued monitoring of survivorship will be needed, particularly since ''recovery'' of the population may be mainly characterized by a shift in the pattern of mortality, and not necessarily in absolute number of losses. 5 refs., 4 figs.
- Research Organization:
- Pacific Northwest Lab., Richland, WA (USA); Montana State Univ., Bozeman (USA). Forestry Sciences Lab.
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 5431112
- Report Number(s):
- PNL-SA-13648; CONF-860290-1; ON: DE86011625
- Resource Relation:
- Conference: 7. international Association for Bear Research and Management conference, Williamsburg, VA, USA, 21 Feb 1986
- Country of Publication:
- United States
- Language:
- English
Similar Records
Projected future abundance of the Yellowstone grizzly bear
Environmental Impacts of Wind Power Development on the Population Biology of Greater Prairie-Chickens