Data from: Generalized spatial mark-resight models with an application to grizzly bears
1. The high cost associated with capture-recapture studies presents a major challenge when monitoring and managing wildlife populations. Recently-developed spatial mark-resight (SMR) models were proposed as a cost-effective alternative because they only require a single marking event. However, exist...
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ftdans:oai:easy.dans.knaw.nl:easy-dataset:97561 2023-07-02T03:33:55+02:00 Data from: Generalized spatial mark-resight models with an application to grizzly bears Whittington, Jesse Hebblewhite, Mark Chandler, Richard B. 2017-06-19T17:50:16.000+02:00 http://nbn-resolving.org/urn:nbn:nl:ui:13-0r-rvpp https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:97561 unknown doi:10.5061/dryad.fn4nf/1 doi:10.1111/1365-2664.12954 http://nbn-resolving.org/urn:nbn:nl:ui:13-0r-rvpp doi:10.5061/dryad.fn4nf https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:97561 OPEN_ACCESS: The data are archived in Easy, they are accessible elsewhere through the DOI https://dans.knaw.nl/en/about/organisation-and-policy/legal-information/DANSLicence.pdf Life sciences medicine and health care 2017 ftdans https://doi.org/10.5061/dryad.fn4nf/110.1111/1365-2664.1295410.5061/dryad.fn4nf 2023-06-13T13:24:39Z 1. The high cost associated with capture-recapture studies presents a major challenge when monitoring and managing wildlife populations. Recently-developed spatial mark-resight (SMR) models were proposed as a cost-effective alternative because they only require a single marking event. However, existing SMR models ignore the marking process and make the tenuous assumption that marked and unmarked populations have the same encounter probabilities. This assumption will be violated in most situations because the marking process results in different spatial distributions of marked and unmarked animals. 2. We developed a generalized SMR model that includes sub-models for the marking and resighting processes, thereby relaxing the assumption that marked and unmarked populations have the same spatial distributions and encounter probabilities. 3. Our simulation study demonstrated that conventional SMR models produce biased density estimates with low credible interval coverage when marked and unmarked animals had differing spatial distributions. In contrast, generalized SMR models produced unbiased density estimates with correct credible interval coverage in all scenarios. 4. We applied our SMR model to grizzly bear (Ursus arctos) data where the marking process occurred along a transportation route through Banff and Yoho National Parks, Canada. Twenty-two grizzly bears were trapped, fitted with radio-collars, and then detected along with unmarked bears on 214 remote cameras. Closed population density estimates (posterior median + 1 SD) averaged from 2012 to 2014 were much lower for conventional SMR models (7.4 + 1.0 bears per 1,000 km2) than for generalized SMR models (12.4 + 1.5). When compared to previous DNA-based estimates, conventional SMR estimates erroneously suggested a 51% decline in density. Conversely, generalized SMR estimates were similar to previous estimates, indicating that the grizzly bear population was relatively stable. 5. Synthesis and application. Conventional SMR models that ignore the marking ... Other/Unknown Material Ursus arctos Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen) Canada |
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Data Archiving and Networked Services (DANS): EASY (KNAW - Koninklijke Nederlandse Akademie van Wetenschappen) |
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Life sciences medicine and health care |
spellingShingle |
Life sciences medicine and health care Whittington, Jesse Hebblewhite, Mark Chandler, Richard B. Data from: Generalized spatial mark-resight models with an application to grizzly bears |
topic_facet |
Life sciences medicine and health care |
description |
1. The high cost associated with capture-recapture studies presents a major challenge when monitoring and managing wildlife populations. Recently-developed spatial mark-resight (SMR) models were proposed as a cost-effective alternative because they only require a single marking event. However, existing SMR models ignore the marking process and make the tenuous assumption that marked and unmarked populations have the same encounter probabilities. This assumption will be violated in most situations because the marking process results in different spatial distributions of marked and unmarked animals. 2. We developed a generalized SMR model that includes sub-models for the marking and resighting processes, thereby relaxing the assumption that marked and unmarked populations have the same spatial distributions and encounter probabilities. 3. Our simulation study demonstrated that conventional SMR models produce biased density estimates with low credible interval coverage when marked and unmarked animals had differing spatial distributions. In contrast, generalized SMR models produced unbiased density estimates with correct credible interval coverage in all scenarios. 4. We applied our SMR model to grizzly bear (Ursus arctos) data where the marking process occurred along a transportation route through Banff and Yoho National Parks, Canada. Twenty-two grizzly bears were trapped, fitted with radio-collars, and then detected along with unmarked bears on 214 remote cameras. Closed population density estimates (posterior median + 1 SD) averaged from 2012 to 2014 were much lower for conventional SMR models (7.4 + 1.0 bears per 1,000 km2) than for generalized SMR models (12.4 + 1.5). When compared to previous DNA-based estimates, conventional SMR estimates erroneously suggested a 51% decline in density. Conversely, generalized SMR estimates were similar to previous estimates, indicating that the grizzly bear population was relatively stable. 5. Synthesis and application. Conventional SMR models that ignore the marking ... |
author |
Whittington, Jesse Hebblewhite, Mark Chandler, Richard B. |
author_facet |
Whittington, Jesse Hebblewhite, Mark Chandler, Richard B. |
author_sort |
Whittington, Jesse |
title |
Data from: Generalized spatial mark-resight models with an application to grizzly bears |
title_short |
Data from: Generalized spatial mark-resight models with an application to grizzly bears |
title_full |
Data from: Generalized spatial mark-resight models with an application to grizzly bears |
title_fullStr |
Data from: Generalized spatial mark-resight models with an application to grizzly bears |
title_full_unstemmed |
Data from: Generalized spatial mark-resight models with an application to grizzly bears |
title_sort |
data from: generalized spatial mark-resight models with an application to grizzly bears |
publishDate |
2017 |
url |
http://nbn-resolving.org/urn:nbn:nl:ui:13-0r-rvpp https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:97561 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_relation |
doi:10.5061/dryad.fn4nf/1 doi:10.1111/1365-2664.12954 http://nbn-resolving.org/urn:nbn:nl:ui:13-0r-rvpp doi:10.5061/dryad.fn4nf https://easy.dans.knaw.nl/ui/datasets/id/easy-dataset:97561 |
op_rights |
OPEN_ACCESS: The data are archived in Easy, they are accessible elsewhere through the DOI https://dans.knaw.nl/en/about/organisation-and-policy/legal-information/DANSLicence.pdf |
op_doi |
https://doi.org/10.5061/dryad.fn4nf/110.1111/1365-2664.1295410.5061/dryad.fn4nf |
_version_ |
1770274063485239296 |