Trend of the Yellowstone Grizzly Bear Population
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 in...
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fthindawi:oai:hindawi.com:10.1155/2010/924197 2023-05-15T18:42:01+02:00 Trend of the Yellowstone Grizzly Bear Population L. L. Eberhardt J. M. Breiwick 2010 https://doi.org/10.1155/2010/924197 en eng International Journal of Ecology https://doi.org/10.1155/2010/924197 Copyright © 2010 L. L. Eberhardt and J. M. Breiwick. Research Article 2010 fthindawi https://doi.org/10.1155/2010/924197 2019-05-26T00:25:59Z 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. Article in Journal/Newspaper Ursus arctos Hindawi Publishing Corporation International Journal of Ecology 2010 1 5 |
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Open Polar |
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Hindawi Publishing Corporation |
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fthindawi |
language |
English |
description |
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. |
format |
Article in Journal/Newspaper |
author |
L. L. Eberhardt J. M. Breiwick |
spellingShingle |
L. L. Eberhardt J. M. Breiwick Trend of the Yellowstone Grizzly Bear Population |
author_facet |
L. L. Eberhardt J. M. Breiwick |
author_sort |
L. L. Eberhardt |
title |
Trend of the Yellowstone Grizzly Bear Population |
title_short |
Trend of the Yellowstone Grizzly Bear Population |
title_full |
Trend of the Yellowstone Grizzly Bear Population |
title_fullStr |
Trend of the Yellowstone Grizzly Bear Population |
title_full_unstemmed |
Trend of the Yellowstone Grizzly Bear Population |
title_sort |
trend of the yellowstone grizzly bear population |
publisher |
International Journal of Ecology |
publishDate |
2010 |
url |
https://doi.org/10.1155/2010/924197 |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_relation |
https://doi.org/10.1155/2010/924197 |
op_rights |
Copyright © 2010 L. L. Eberhardt and J. M. Breiwick. |
op_doi |
https://doi.org/10.1155/2010/924197 |
container_title |
International Journal of Ecology |
container_volume |
2010 |
container_start_page |
1 |
op_container_end_page |
5 |
_version_ |
1766231603184402432 |