Power of Sign Surveys to Monitor Population Trends
The urgent need for an effective monitoring scheme for grizzly bear (Ursus arctos) populations led us to investigate the effort required to detect changes in populations of low—density dispersed animals, using sign (mainly scats and tracks) they leave on trails. We surveyed trails in Glacier Nationa...
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Language: | English |
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Online Access: | http://dx.doi.org/10.2307/1941877 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1941877 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/1941877 |
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crwiley:10.2307/1941877 2024-06-23T07:57:21+00:00 Power of Sign Surveys to Monitor Population Trends Kendall, Katherine C. Metzgar, Lee H. Patterson, David A. Steele, Brian M. 1992 http://dx.doi.org/10.2307/1941877 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1941877 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/1941877 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Ecological Applications volume 2, issue 4, page 422-430 ISSN 1051-0761 1939-5582 journal-article 1992 crwiley https://doi.org/10.2307/1941877 2024-06-06T04:22:39Z The urgent need for an effective monitoring scheme for grizzly bear (Ursus arctos) populations led us to investigate the effort required to detect changes in populations of low—density dispersed animals, using sign (mainly scats and tracks) they leave on trails. We surveyed trails in Glacier National Park for bear tracks and scats during five consecutive years. Using these data, we modeled the occurrence of bear sign on trails, then estimated the power of various sampling schemes. Specifically, we explored the power of bear sign surveys to detect a 20% decline in sign occurrence. Realistic sampling schemes appear feasible if the density of sign is high enough, and we provide guidelines for designs with adequate replication to monitor long—term trends of dispersed populations using sign occurrences on trails. Article in Journal/Newspaper Ursus arctos Wiley Online Library Ecological Applications 2 4 422 430 |
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Open Polar |
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Wiley Online Library |
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crwiley |
language |
English |
description |
The urgent need for an effective monitoring scheme for grizzly bear (Ursus arctos) populations led us to investigate the effort required to detect changes in populations of low—density dispersed animals, using sign (mainly scats and tracks) they leave on trails. We surveyed trails in Glacier National Park for bear tracks and scats during five consecutive years. Using these data, we modeled the occurrence of bear sign on trails, then estimated the power of various sampling schemes. Specifically, we explored the power of bear sign surveys to detect a 20% decline in sign occurrence. Realistic sampling schemes appear feasible if the density of sign is high enough, and we provide guidelines for designs with adequate replication to monitor long—term trends of dispersed populations using sign occurrences on trails. |
format |
Article in Journal/Newspaper |
author |
Kendall, Katherine C. Metzgar, Lee H. Patterson, David A. Steele, Brian M. |
spellingShingle |
Kendall, Katherine C. Metzgar, Lee H. Patterson, David A. Steele, Brian M. Power of Sign Surveys to Monitor Population Trends |
author_facet |
Kendall, Katherine C. Metzgar, Lee H. Patterson, David A. Steele, Brian M. |
author_sort |
Kendall, Katherine C. |
title |
Power of Sign Surveys to Monitor Population Trends |
title_short |
Power of Sign Surveys to Monitor Population Trends |
title_full |
Power of Sign Surveys to Monitor Population Trends |
title_fullStr |
Power of Sign Surveys to Monitor Population Trends |
title_full_unstemmed |
Power of Sign Surveys to Monitor Population Trends |
title_sort |
power of sign surveys to monitor population trends |
publisher |
Wiley |
publishDate |
1992 |
url |
http://dx.doi.org/10.2307/1941877 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.2307%2F1941877 https://esajournals.onlinelibrary.wiley.com/doi/pdf/10.2307/1941877 |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_source |
Ecological Applications volume 2, issue 4, page 422-430 ISSN 1051-0761 1939-5582 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.2307/1941877 |
container_title |
Ecological Applications |
container_volume |
2 |
container_issue |
4 |
container_start_page |
422 |
op_container_end_page |
430 |
_version_ |
1802650957541015552 |