Estimating Grizzly and Black Bear Population Abundance and Trend in Banff National Park Using Noninvasive Genetic Sampling

We evaluated the potential of two noninvasive genetic sampling methods, hair traps and bear rub surveys, to estimate population abundance and trend of grizzly (Ursus arctos) and black bear (U. americanus) populations in Banff National Park, Alberta, Canada. Using Huggins closed population mark-recap...

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Published in:PLoS ONE
Main Authors: Sawaya, Michael A., Stetz, Jeffrey B., Clevenger, Anthony P., Gibeau, Michael L., Kalinowski, Steven T.
Format: Text
Language:English
Published: Public Library of Science 2012
Subjects:
Online Access:http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3342321
http://www.ncbi.nlm.nih.gov/pubmed/22567089
https://doi.org/10.1371/journal.pone.0034777
id ftpubmed:oai:pubmedcentral.nih.gov:3342321
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spelling ftpubmed:oai:pubmedcentral.nih.gov:3342321 2023-05-15T18:42:08+02:00 Estimating Grizzly and Black Bear Population Abundance and Trend in Banff National Park Using Noninvasive Genetic Sampling Sawaya, Michael A. Stetz, Jeffrey B. Clevenger, Anthony P. Gibeau, Michael L. Kalinowski, Steven T. 2012-05-02 http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3342321 http://www.ncbi.nlm.nih.gov/pubmed/22567089 https://doi.org/10.1371/journal.pone.0034777 en eng Public Library of Science http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3342321 http://www.ncbi.nlm.nih.gov/pubmed/22567089 http://dx.doi.org/10.1371/journal.pone.0034777 Sawaya et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. CC-BY Research Article Text 2012 ftpubmed https://doi.org/10.1371/journal.pone.0034777 2013-09-04T06:36:50Z We evaluated the potential of two noninvasive genetic sampling methods, hair traps and bear rub surveys, to estimate population abundance and trend of grizzly (Ursus arctos) and black bear (U. americanus) populations in Banff National Park, Alberta, Canada. Using Huggins closed population mark-recapture models, we obtained the first precise abundance estimates for grizzly bears ( = 73.5, 95% CI = 64–94 in 2006; = 50.4, 95% CI = 49–59 in 2008) and black bears ( = 62.6, 95% CI = 51–89 in 2006; = 81.8, 95% CI = 72–102 in 2008) in the Bow Valley. Hair traps had high detection rates for female grizzlies, and male and female black bears, but extremely low detection rates for male grizzlies. Conversely, bear rubs had high detection rates for male and female grizzlies, but low rates for black bears. We estimated realized population growth rates, lambda, for grizzly bear males ( = 0.93, 95% CI = 0.74–1.17) and females ( = 0.90, 95% CI = 0.67–1.20) using Pradel open population models with three years of bear rub data. Lambda estimates are supported by abundance estimates from combined hair trap/bear rub closed population models and are consistent with a system that is likely driven by high levels of human-caused mortality. Our results suggest that bear rub surveys would provide an efficient and powerful means to inventory and monitor grizzly bear populations in the Central Canadian Rocky Mountains. Text Ursus arctos PubMed Central (PMC) Canada Huggins ENVELOPE(162.483,162.483,-78.283,-78.283) Lambda ENVELOPE(-62.983,-62.983,-64.300,-64.300) PLoS ONE 7 5 e34777
institution Open Polar
collection PubMed Central (PMC)
op_collection_id ftpubmed
language English
topic Research Article
spellingShingle Research Article
Sawaya, Michael A.
Stetz, Jeffrey B.
Clevenger, Anthony P.
Gibeau, Michael L.
Kalinowski, Steven T.
Estimating Grizzly and Black Bear Population Abundance and Trend in Banff National Park Using Noninvasive Genetic Sampling
topic_facet Research Article
description We evaluated the potential of two noninvasive genetic sampling methods, hair traps and bear rub surveys, to estimate population abundance and trend of grizzly (Ursus arctos) and black bear (U. americanus) populations in Banff National Park, Alberta, Canada. Using Huggins closed population mark-recapture models, we obtained the first precise abundance estimates for grizzly bears ( = 73.5, 95% CI = 64–94 in 2006; = 50.4, 95% CI = 49–59 in 2008) and black bears ( = 62.6, 95% CI = 51–89 in 2006; = 81.8, 95% CI = 72–102 in 2008) in the Bow Valley. Hair traps had high detection rates for female grizzlies, and male and female black bears, but extremely low detection rates for male grizzlies. Conversely, bear rubs had high detection rates for male and female grizzlies, but low rates for black bears. We estimated realized population growth rates, lambda, for grizzly bear males ( = 0.93, 95% CI = 0.74–1.17) and females ( = 0.90, 95% CI = 0.67–1.20) using Pradel open population models with three years of bear rub data. Lambda estimates are supported by abundance estimates from combined hair trap/bear rub closed population models and are consistent with a system that is likely driven by high levels of human-caused mortality. Our results suggest that bear rub surveys would provide an efficient and powerful means to inventory and monitor grizzly bear populations in the Central Canadian Rocky Mountains.
format Text
author Sawaya, Michael A.
Stetz, Jeffrey B.
Clevenger, Anthony P.
Gibeau, Michael L.
Kalinowski, Steven T.
author_facet Sawaya, Michael A.
Stetz, Jeffrey B.
Clevenger, Anthony P.
Gibeau, Michael L.
Kalinowski, Steven T.
author_sort Sawaya, Michael A.
title Estimating Grizzly and Black Bear Population Abundance and Trend in Banff National Park Using Noninvasive Genetic Sampling
title_short Estimating Grizzly and Black Bear Population Abundance and Trend in Banff National Park Using Noninvasive Genetic Sampling
title_full Estimating Grizzly and Black Bear Population Abundance and Trend in Banff National Park Using Noninvasive Genetic Sampling
title_fullStr Estimating Grizzly and Black Bear Population Abundance and Trend in Banff National Park Using Noninvasive Genetic Sampling
title_full_unstemmed Estimating Grizzly and Black Bear Population Abundance and Trend in Banff National Park Using Noninvasive Genetic Sampling
title_sort estimating grizzly and black bear population abundance and trend in banff national park using noninvasive genetic sampling
publisher Public Library of Science
publishDate 2012
url http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3342321
http://www.ncbi.nlm.nih.gov/pubmed/22567089
https://doi.org/10.1371/journal.pone.0034777
long_lat ENVELOPE(162.483,162.483,-78.283,-78.283)
ENVELOPE(-62.983,-62.983,-64.300,-64.300)
geographic Canada
Huggins
Lambda
geographic_facet Canada
Huggins
Lambda
genre Ursus arctos
genre_facet Ursus arctos
op_relation http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3342321
http://www.ncbi.nlm.nih.gov/pubmed/22567089
http://dx.doi.org/10.1371/journal.pone.0034777
op_rights Sawaya et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
op_rightsnorm CC-BY
op_doi https://doi.org/10.1371/journal.pone.0034777
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