The estimation of grizzly bear density through hair‐snagging techniques above the tree line
ABSTRACT Assessing grizzly bears' ( Ursus arctos ) abundance in the Arctic has been challenging because of the large scale of their movements and the remoteness of field locations. We modified a post sampling method used for wolverines ( Gulo gulo ) to allow collection of hair samples from griz...
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crwiley:10.1002/wsb.520 2024-06-23T07:50:34+00:00 The estimation of grizzly bear density through hair‐snagging techniques above the tree line Dumond, Mathieu Boulanger, John Paetkau, David Government of Nunavut Nunavut Wildlife Management Board 2015 http://dx.doi.org/10.1002/wsb.520 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fwsb.520 https://onlinelibrary.wiley.com/doi/full/10.1002/wsb.520 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Wildlife Society Bulletin volume 39, issue 2, page 390-402 ISSN 1938-5463 journal-article 2015 crwiley https://doi.org/10.1002/wsb.520 2024-06-11T04:51:01Z ABSTRACT Assessing grizzly bears' ( Ursus arctos ) abundance in the Arctic has been challenging because of the large scale of their movements and the remoteness of field locations. We modified a post sampling method used for wolverines ( Gulo gulo ) to allow collection of hair samples from grizzly bears in the Canadian tundra. We deployed 1 post/cell in a sampling grid of 393 10 × 10‐km cells sampled in 2008 and 2009 for two 14‐day sessions in July–August of both years. We then compared density estimates from mark–recapture estimators that used telemetry data from previous years with spatially explicit mark–recapture models that used only genetic detections. Over the 2 years of sampling, we detected 98 female and 81 male grizzly bears. We found that the DNA degradation rate was related to collection interval and the number of days between rainfall events and sample collection. Estimates of density were in the order of 5 bears/1,000 km 2 . The estimates from the 2 methods were statistically similar, but spatially explicit estimates were more precise than those using radiocollar data. Our results provide the first demonstration of the viability of posts as hair‐snagging stations to obtain DNA from grizzly bears, and of spatially explicit mark–recapture methods to estimate population size and density for grizzly bears above the tree line. © 2015 The Wildlife Society. Article in Journal/Newspaper Arctic Gulo gulo Tundra Ursus arctos Wiley Online Library Arctic Wildlife Society Bulletin 39 2 390 402 |
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Wiley Online Library |
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crwiley |
language |
English |
description |
ABSTRACT Assessing grizzly bears' ( Ursus arctos ) abundance in the Arctic has been challenging because of the large scale of their movements and the remoteness of field locations. We modified a post sampling method used for wolverines ( Gulo gulo ) to allow collection of hair samples from grizzly bears in the Canadian tundra. We deployed 1 post/cell in a sampling grid of 393 10 × 10‐km cells sampled in 2008 and 2009 for two 14‐day sessions in July–August of both years. We then compared density estimates from mark–recapture estimators that used telemetry data from previous years with spatially explicit mark–recapture models that used only genetic detections. Over the 2 years of sampling, we detected 98 female and 81 male grizzly bears. We found that the DNA degradation rate was related to collection interval and the number of days between rainfall events and sample collection. Estimates of density were in the order of 5 bears/1,000 km 2 . The estimates from the 2 methods were statistically similar, but spatially explicit estimates were more precise than those using radiocollar data. Our results provide the first demonstration of the viability of posts as hair‐snagging stations to obtain DNA from grizzly bears, and of spatially explicit mark–recapture methods to estimate population size and density for grizzly bears above the tree line. © 2015 The Wildlife Society. |
author2 |
Government of Nunavut Nunavut Wildlife Management Board |
format |
Article in Journal/Newspaper |
author |
Dumond, Mathieu Boulanger, John Paetkau, David |
spellingShingle |
Dumond, Mathieu Boulanger, John Paetkau, David The estimation of grizzly bear density through hair‐snagging techniques above the tree line |
author_facet |
Dumond, Mathieu Boulanger, John Paetkau, David |
author_sort |
Dumond, Mathieu |
title |
The estimation of grizzly bear density through hair‐snagging techniques above the tree line |
title_short |
The estimation of grizzly bear density through hair‐snagging techniques above the tree line |
title_full |
The estimation of grizzly bear density through hair‐snagging techniques above the tree line |
title_fullStr |
The estimation of grizzly bear density through hair‐snagging techniques above the tree line |
title_full_unstemmed |
The estimation of grizzly bear density through hair‐snagging techniques above the tree line |
title_sort |
estimation of grizzly bear density through hair‐snagging techniques above the tree line |
publisher |
Wiley |
publishDate |
2015 |
url |
http://dx.doi.org/10.1002/wsb.520 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fwsb.520 https://onlinelibrary.wiley.com/doi/full/10.1002/wsb.520 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Gulo gulo Tundra Ursus arctos |
genre_facet |
Arctic Gulo gulo Tundra Ursus arctos |
op_source |
Wildlife Society Bulletin volume 39, issue 2, page 390-402 ISSN 1938-5463 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/wsb.520 |
container_title |
Wildlife Society Bulletin |
container_volume |
39 |
container_issue |
2 |
container_start_page |
390 |
op_container_end_page |
402 |
_version_ |
1802641482109157376 |