Monitoring Grizzly Bear Population Trends

A simple difference equation model was developed to provide additional perspective on observed mortality and trend data on Yellowstone grizzly bears (Ursus arctos horribilis). Records of mortalities of adult females from 1959 to 1985 were utilized, in conjunction with data on females with cubs. The...

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Veröffentlicht in:	The Journal of wildlife management 1986-10, Vol.50 (4), p.613-618
Hauptverfasser:	Eberhardt, L. L., Knight, R. R., Blanchard, B. M.
Format:	Artikel
Sprache:	eng
Schlagworte:	Age Animal and plant ecology Animal, plant and microbial ecology Animals Bears Biological and medical sciences Demecology Fundamental and applied biological sciences. Psychology Grizzly bears Life tables Litter size Mating behavior Mortality Population estimates Population size Population trends Ursus arctos horribilis
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Beschreibung
Zusammenfassung:	A simple difference equation model was developed to provide additional perspective on observed mortality and trend data on Yellowstone grizzly bears (Ursus arctos horribilis). Records of mortalities of adult females from 1959 to 1985 were utilized, in conjunction with data on females with cubs. The overall downward trend of observed numbers of females with cubs generally agrees with the model calculations but does not adequately reflect mortality from 1970 to 1974. The model may be useful in developing a composite index of population trend.
ISSN:	0022-541X 1937-2817
DOI:	10.2307/3800971