trend of the yellowstone grizzly bear population
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ID: 184480
2010
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Abstract
Yellowstone's grizzlies (Ursus arctos) have been studied for more than 40 years. Radiotelemetry has been used to obtain estimates of the rate of increase of the population, with results reported by Schwartz et al. (2006). Counts of females with cubs-of-the-year “unduplicated” also provide an index of abundance and are the primary subject of this report. An exponential model was fitted to n=24 such counts, using nonlinear leastsquares. Estimates of the rate of increase, r, were about 0.053. 95% confidence intervals, were obtained by several different methods, and all had lower limits substantially above zero, indicating that the population has been increasing steadily, in contrast to the results of Schwartz et al. (2006), which could not exclude a decreasing population. The grizzly data have been repeatedly mis-used in current literature for reasons explained here.
| Reference Key |
eberhardt2010internationaltrend
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|---|---|
| Authors | ;L. L. Eberhardt;J. M. Breiwick |
| Journal | human vaccines & immunotherapeutics |
| Year | 2010 |
| DOI |
10.1155/2010/924197
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| URL | |
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