DNA‐based population estimate for grizzly bears Ursus arctos in northeastern British Columbia, Canada
Current harvest management of grizzly bears Ursus arctos in British Columbia (B.C.), Canada, is based primarily on modeling of habitat capability/suitability. No research has been conducted in the northern half of B.C. to verify these habitat‐based estimates. We estimated grizzly bear population siz...
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crwiley:10.2981/wlb.2001.014 2023-12-03T10:31:03+01:00 DNA‐based population estimate for grizzly bears Ursus arctos in northeastern British Columbia, Canada Poole, Kim G. Mowat, Garth Fear, Darcy A. 2001 http://dx.doi.org/10.2981/wlb.2001.014 https://onlinelibrary.wiley.com/doi/full-xml/10.2981/wlb.2001.014 https://onlinelibrary.wiley.com/doi/pdf/10.2981/wlb.2001.014 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Wildlife Biology volume 7, issue 2, page 105-115 ISSN 1903-220X 1903-220X Management, Monitoring, Policy and Law Nature and Landscape Conservation Ecology, Evolution, Behavior and Systematics journal-article 2001 crwiley https://doi.org/10.2981/wlb.2001.014 2023-11-09T13:29:01Z Current harvest management of grizzly bears Ursus arctos in British Columbia (B.C.), Canada, is based primarily on modeling of habitat capability/suitability. No research has been conducted in the northern half of B.C. to verify these habitat‐based estimates. We estimated grizzly bear population size in a 8,527 km 2 study area in northeastern B.C. that included the east slopes of the northern Rocky Mountains (Northern Boreal Mountains ecoprovince) and the boreal plains (Taiga Plains ecoprovince) using hair removal to sample bears, microsatellite profiling to identify individuals, and mark‐recapture models. We placed bait sites encircled by barbed wire in a grid of 103 9 × 9 km (81 km 2 ) cells. In each cell a different bait site was set for 12 days in each of five sessions. We collected 2,062 hair samples from 332 sites and detected grizzly bears at 113 sites. DNA profiling of grizzly bear samples identified 98 different bears; 44 of these individuals were females, 47 were males, and the remaining seven individuals could not be sexed. Forty‐one grizzly bears were caught at >1 site. We used a closed mark‐recapture model to obtain a naive population estimate of 148 grizzly bears (95% confidence interval (Cl): 124–182). We reduced this estimate by 6.8% to account for closure bias, which resulted in an adjusted population estimate of 138 grizzly bears (95% Cl: 114–172) within the study area (16 bears/1,000 km 2 95% Cl: 13–20). Within the two biophysical ecoprovinces we estimated a density (corrected for closure) of 29 bears/1,000 km 2 (95% Cl: 23–37) for the Northern Boreal Mountains and 10 bears/1,000 km 2 (95% Cl: 7–18) for the Taiga Plains. The current habitat‐based capability ratings for grizzly bears in the boreal ecoprovinces of B.C. are supported by our results in the Taiga Plains, but are lower than densities we obtained in the Northern Boreal Mountains by about half. With further testing, habitat‐based estimates of grizzly bear density in B.C. could be adjusted using the results of DNA‐based ... Article in Journal/Newspaper taiga Taiga plains Ursus arctos Wiley Online Library (via Crossref) Canada British Columbia ENVELOPE(-125.003,-125.003,54.000,54.000) Wildlife Biology 7 2 105 115 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
Management, Monitoring, Policy and Law Nature and Landscape Conservation Ecology, Evolution, Behavior and Systematics |
spellingShingle |
Management, Monitoring, Policy and Law Nature and Landscape Conservation Ecology, Evolution, Behavior and Systematics Poole, Kim G. Mowat, Garth Fear, Darcy A. DNA‐based population estimate for grizzly bears Ursus arctos in northeastern British Columbia, Canada |
topic_facet |
Management, Monitoring, Policy and Law Nature and Landscape Conservation Ecology, Evolution, Behavior and Systematics |
description |
Current harvest management of grizzly bears Ursus arctos in British Columbia (B.C.), Canada, is based primarily on modeling of habitat capability/suitability. No research has been conducted in the northern half of B.C. to verify these habitat‐based estimates. We estimated grizzly bear population size in a 8,527 km 2 study area in northeastern B.C. that included the east slopes of the northern Rocky Mountains (Northern Boreal Mountains ecoprovince) and the boreal plains (Taiga Plains ecoprovince) using hair removal to sample bears, microsatellite profiling to identify individuals, and mark‐recapture models. We placed bait sites encircled by barbed wire in a grid of 103 9 × 9 km (81 km 2 ) cells. In each cell a different bait site was set for 12 days in each of five sessions. We collected 2,062 hair samples from 332 sites and detected grizzly bears at 113 sites. DNA profiling of grizzly bear samples identified 98 different bears; 44 of these individuals were females, 47 were males, and the remaining seven individuals could not be sexed. Forty‐one grizzly bears were caught at >1 site. We used a closed mark‐recapture model to obtain a naive population estimate of 148 grizzly bears (95% confidence interval (Cl): 124–182). We reduced this estimate by 6.8% to account for closure bias, which resulted in an adjusted population estimate of 138 grizzly bears (95% Cl: 114–172) within the study area (16 bears/1,000 km 2 95% Cl: 13–20). Within the two biophysical ecoprovinces we estimated a density (corrected for closure) of 29 bears/1,000 km 2 (95% Cl: 23–37) for the Northern Boreal Mountains and 10 bears/1,000 km 2 (95% Cl: 7–18) for the Taiga Plains. The current habitat‐based capability ratings for grizzly bears in the boreal ecoprovinces of B.C. are supported by our results in the Taiga Plains, but are lower than densities we obtained in the Northern Boreal Mountains by about half. With further testing, habitat‐based estimates of grizzly bear density in B.C. could be adjusted using the results of DNA‐based ... |
format |
Article in Journal/Newspaper |
author |
Poole, Kim G. Mowat, Garth Fear, Darcy A. |
author_facet |
Poole, Kim G. Mowat, Garth Fear, Darcy A. |
author_sort |
Poole, Kim G. |
title |
DNA‐based population estimate for grizzly bears Ursus arctos in northeastern British Columbia, Canada |
title_short |
DNA‐based population estimate for grizzly bears Ursus arctos in northeastern British Columbia, Canada |
title_full |
DNA‐based population estimate for grizzly bears Ursus arctos in northeastern British Columbia, Canada |
title_fullStr |
DNA‐based population estimate for grizzly bears Ursus arctos in northeastern British Columbia, Canada |
title_full_unstemmed |
DNA‐based population estimate for grizzly bears Ursus arctos in northeastern British Columbia, Canada |
title_sort |
dna‐based population estimate for grizzly bears ursus arctos in northeastern british columbia, canada |
publisher |
Wiley |
publishDate |
2001 |
url |
http://dx.doi.org/10.2981/wlb.2001.014 https://onlinelibrary.wiley.com/doi/full-xml/10.2981/wlb.2001.014 https://onlinelibrary.wiley.com/doi/pdf/10.2981/wlb.2001.014 |
long_lat |
ENVELOPE(-125.003,-125.003,54.000,54.000) |
geographic |
Canada British Columbia |
geographic_facet |
Canada British Columbia |
genre |
taiga Taiga plains Ursus arctos |
genre_facet |
taiga Taiga plains Ursus arctos |
op_source |
Wildlife Biology volume 7, issue 2, page 105-115 ISSN 1903-220X 1903-220X |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.2981/wlb.2001.014 |
container_title |
Wildlife Biology |
container_volume |
7 |
container_issue |
2 |
container_start_page |
105 |
op_container_end_page |
115 |
_version_ |
1784257191908212736 |