Evaluating Estimators of the Numbers of Females With Cubs-Of-The-Year in the Yellowstone Grizzly Bear Population
Current management of the grizzly bear (Ursus arctos) population in Yellowstone National Park and surrounding areas requires annual estimation of the number of adult female bears with cubs-of-the-year. We examined the performance of nine estimators of population size via simulation. Data were simula...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.579.7720 2023-05-15T18:41:50+02:00 Evaluating Estimators of the Numbers of Females With Cubs-Of-The-Year in the Yellowstone Grizzly Bear Population Steve Cherry Gary C. White Kim A. Keating Mark A. Haroldson Charles C. Schwartz The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.579.7720 http://www.nrmsc.usgs.gov/files/norock/products/Cherry_et_al_2007_JABES_12_195-215.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.579.7720 http://www.nrmsc.usgs.gov/files/norock/products/Cherry_et_al_2007_JABES_12_195-215.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.nrmsc.usgs.gov/files/norock/products/Cherry_et_al_2007_JABES_12_195-215.pdf Key Words Beta distribution Chao estimators Closed population estimation Indi- vidual heterogeneity Model Mh Negative binomial distribution Ursus arctos text ftciteseerx 2016-01-08T12:55:43Z Current management of the grizzly bear (Ursus arctos) population in Yellowstone National Park and surrounding areas requires annual estimation of the number of adult female bears with cubs-of-the-year. We examined the performance of nine estimators of population size via simulation. Data were simulated using two methods for different combinations of population size, sample size, and coefficient of variation of individual sighting probabilities. We show that the coefficient of variation does not, by itself, ade-quately describe the effects of capture heterogeneity, because two different distributions of capture probabilities can have the same coefficient of variation. All estimators pro-duced biased estimates of population size with bias decreasing as effort increased. Based on the simulation results we recommend the Chao estimator for model Mh be used to estimate the number of female bears with cubs of the year; however, the estimator of Chao and Shen may also be useful depending on the goals of the research. Text Ursus arctos Unknown |
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ftciteseerx |
language |
English |
topic |
Key Words Beta distribution Chao estimators Closed population estimation Indi- vidual heterogeneity Model Mh Negative binomial distribution Ursus arctos |
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Key Words Beta distribution Chao estimators Closed population estimation Indi- vidual heterogeneity Model Mh Negative binomial distribution Ursus arctos Steve Cherry Gary C. White Kim A. Keating Mark A. Haroldson Charles C. Schwartz Evaluating Estimators of the Numbers of Females With Cubs-Of-The-Year in the Yellowstone Grizzly Bear Population |
topic_facet |
Key Words Beta distribution Chao estimators Closed population estimation Indi- vidual heterogeneity Model Mh Negative binomial distribution Ursus arctos |
description |
Current management of the grizzly bear (Ursus arctos) population in Yellowstone National Park and surrounding areas requires annual estimation of the number of adult female bears with cubs-of-the-year. We examined the performance of nine estimators of population size via simulation. Data were simulated using two methods for different combinations of population size, sample size, and coefficient of variation of individual sighting probabilities. We show that the coefficient of variation does not, by itself, ade-quately describe the effects of capture heterogeneity, because two different distributions of capture probabilities can have the same coefficient of variation. All estimators pro-duced biased estimates of population size with bias decreasing as effort increased. Based on the simulation results we recommend the Chao estimator for model Mh be used to estimate the number of female bears with cubs of the year; however, the estimator of Chao and Shen may also be useful depending on the goals of the research. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Steve Cherry Gary C. White Kim A. Keating Mark A. Haroldson Charles C. Schwartz |
author_facet |
Steve Cherry Gary C. White Kim A. Keating Mark A. Haroldson Charles C. Schwartz |
author_sort |
Steve Cherry |
title |
Evaluating Estimators of the Numbers of Females With Cubs-Of-The-Year in the Yellowstone Grizzly Bear Population |
title_short |
Evaluating Estimators of the Numbers of Females With Cubs-Of-The-Year in the Yellowstone Grizzly Bear Population |
title_full |
Evaluating Estimators of the Numbers of Females With Cubs-Of-The-Year in the Yellowstone Grizzly Bear Population |
title_fullStr |
Evaluating Estimators of the Numbers of Females With Cubs-Of-The-Year in the Yellowstone Grizzly Bear Population |
title_full_unstemmed |
Evaluating Estimators of the Numbers of Females With Cubs-Of-The-Year in the Yellowstone Grizzly Bear Population |
title_sort |
evaluating estimators of the numbers of females with cubs-of-the-year in the yellowstone grizzly bear population |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.579.7720 http://www.nrmsc.usgs.gov/files/norock/products/Cherry_et_al_2007_JABES_12_195-215.pdf |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_source |
http://www.nrmsc.usgs.gov/files/norock/products/Cherry_et_al_2007_JABES_12_195-215.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.579.7720 http://www.nrmsc.usgs.gov/files/norock/products/Cherry_et_al_2007_JABES_12_195-215.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766231398610370560 |