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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ftzenodo:oai:zenodo.org:5004130 2024-09-15T18:40:17+00:00 Data from: Generalized spatial mark-resight models with an application to grizzly bears Whittington, Jesse Hebblewhite, Mark Chandler, Richard B. 2018-05-25 https://doi.org/10.5061/dryad.fn4nf unknown Zenodo https://doi.org/10.1111/1365-2664.12954 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.fn4nf oai:zenodo.org:5004130 info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode population density point process model spatial capture-recapture hierarchical model telemetry camera trap info:eu-repo/semantics/other 2018 ftzenodo https://doi.org/10.5061/dryad.fn4nf10.1111/1365-2664.12954 2024-07-27T01:19:28Z 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 Zenodo |
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population density point process model spatial capture-recapture hierarchical model telemetry camera trap |
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population density point process model spatial capture-recapture hierarchical model telemetry camera trap Whittington, Jesse Hebblewhite, Mark Chandler, Richard B. Data from: Generalized spatial mark-resight models with an application to grizzly bears |
topic_facet |
population density point process model spatial capture-recapture hierarchical model telemetry camera trap |
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 ... |
format |
Other/Unknown Material |
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 |
publisher |
Zenodo |
publishDate |
2018 |
url |
https://doi.org/10.5061/dryad.fn4nf |
genre |
Ursus arctos |
genre_facet |
Ursus arctos |
op_relation |
https://doi.org/10.1111/1365-2664.12954 https://zenodo.org/communities/dryad https://doi.org/10.5061/dryad.fn4nf oai:zenodo.org:5004130 |
op_rights |
info:eu-repo/semantics/openAccess Creative Commons Zero v1.0 Universal https://creativecommons.org/publicdomain/zero/1.0/legalcode |
op_doi |
https://doi.org/10.5061/dryad.fn4nf10.1111/1365-2664.12954 |
_version_ |
1810484589552992256 |