A new scoring system for use in capture–recapture studies for bowhead whales photographed with drones1
Effective management of animal populations requires knowledge of life history parameters and estimates of population abundance. One method commonly used to estimate abundance is capture–recapture analyses of photographs. Small, relatively inexpensive, rotary-wing drones have become an effective plat...
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Canadian Science Publishing
2022
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Online Access: | https://doi.org/10.1139/juvs-2021-0027 https://doaj.org/article/09a6628cc65c48f28b9fb1ce05d65fda |
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ftdoajarticles:oai:doaj.org/article:09a6628cc65c48f28b9fb1ce05d65fda 2023-10-09T21:50:05+02:00 A new scoring system for use in capture–recapture studies for bowhead whales photographed with drones1 William R. Koski Brent G. Young 2022-01-01T00:00:00Z https://doi.org/10.1139/juvs-2021-0027 https://doaj.org/article/09a6628cc65c48f28b9fb1ce05d65fda EN eng Canadian Science Publishing https://cdnsciencepub.com/doi/10.1139/juvs-2021-0027 https://doaj.org/toc/2564-4939 doi:10.1139/juvs-2021-0027 2564-4939 https://doaj.org/article/09a6628cc65c48f28b9fb1ce05d65fda Drone Systems and Applications, Vol 10, Iss 1, Pp 15-25 (2022) drone marked photo quality aerial photograph bowhead whale Motor vehicles. Aeronautics. Astronautics TL1-4050 article 2022 ftdoajarticles https://doi.org/10.1139/juvs-2021-0027 2023-09-10T00:46:29Z Effective management of animal populations requires knowledge of life history parameters and estimates of population abundance. One method commonly used to estimate abundance is capture–recapture analyses of photographs. Small, relatively inexpensive, rotary-wing drones have become an effective platform for obtaining high-quality aerial photographs of whales. To conduct capture–recapture analyses the animal needs to be defined as marked or unmarked and the photographs must be of high quality. While a system for scoring quality and markedness has previously been developed for bowhead whales (Balaena mysticetus Linnaeus, 1758) (Rugh et al. 1998. Rep. int. Whal. Commn. 48: 501–512), a revised scoring system was needed to incorporate increased information in photographs taken by drones. We present a revised scoring system that enlarges two of the previously defined areas of the whale examined for markings and incorporates smaller markings into the definition of marked whales. We scored 30 whales using the previous criteria and the revised criteria developed in this paper. More whales were identified as marked (23%) and mark scores were higher for 30% of the zones scored using the new system. Increasing the number of marked whales during capture–recapture studies increases the precision of estimated parameters and permits us to make those estimates with smaller samples of photographs. Article in Journal/Newspaper Balaena mysticetus bowhead whale Directory of Open Access Journals: DOAJ Articles Drone Systems and Applications 10 1 15 25 |
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Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
drone marked photo quality aerial photograph bowhead whale Motor vehicles. Aeronautics. Astronautics TL1-4050 |
spellingShingle |
drone marked photo quality aerial photograph bowhead whale Motor vehicles. Aeronautics. Astronautics TL1-4050 William R. Koski Brent G. Young A new scoring system for use in capture–recapture studies for bowhead whales photographed with drones1 |
topic_facet |
drone marked photo quality aerial photograph bowhead whale Motor vehicles. Aeronautics. Astronautics TL1-4050 |
description |
Effective management of animal populations requires knowledge of life history parameters and estimates of population abundance. One method commonly used to estimate abundance is capture–recapture analyses of photographs. Small, relatively inexpensive, rotary-wing drones have become an effective platform for obtaining high-quality aerial photographs of whales. To conduct capture–recapture analyses the animal needs to be defined as marked or unmarked and the photographs must be of high quality. While a system for scoring quality and markedness has previously been developed for bowhead whales (Balaena mysticetus Linnaeus, 1758) (Rugh et al. 1998. Rep. int. Whal. Commn. 48: 501–512), a revised scoring system was needed to incorporate increased information in photographs taken by drones. We present a revised scoring system that enlarges two of the previously defined areas of the whale examined for markings and incorporates smaller markings into the definition of marked whales. We scored 30 whales using the previous criteria and the revised criteria developed in this paper. More whales were identified as marked (23%) and mark scores were higher for 30% of the zones scored using the new system. Increasing the number of marked whales during capture–recapture studies increases the precision of estimated parameters and permits us to make those estimates with smaller samples of photographs. |
format |
Article in Journal/Newspaper |
author |
William R. Koski Brent G. Young |
author_facet |
William R. Koski Brent G. Young |
author_sort |
William R. Koski |
title |
A new scoring system for use in capture–recapture studies for bowhead whales photographed with drones1 |
title_short |
A new scoring system for use in capture–recapture studies for bowhead whales photographed with drones1 |
title_full |
A new scoring system for use in capture–recapture studies for bowhead whales photographed with drones1 |
title_fullStr |
A new scoring system for use in capture–recapture studies for bowhead whales photographed with drones1 |
title_full_unstemmed |
A new scoring system for use in capture–recapture studies for bowhead whales photographed with drones1 |
title_sort |
new scoring system for use in capture–recapture studies for bowhead whales photographed with drones1 |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
https://doi.org/10.1139/juvs-2021-0027 https://doaj.org/article/09a6628cc65c48f28b9fb1ce05d65fda |
genre |
Balaena mysticetus bowhead whale |
genre_facet |
Balaena mysticetus bowhead whale |
op_source |
Drone Systems and Applications, Vol 10, Iss 1, Pp 15-25 (2022) |
op_relation |
https://cdnsciencepub.com/doi/10.1139/juvs-2021-0027 https://doaj.org/toc/2564-4939 doi:10.1139/juvs-2021-0027 2564-4939 https://doaj.org/article/09a6628cc65c48f28b9fb1ce05d65fda |
op_doi |
https://doi.org/10.1139/juvs-2021-0027 |
container_title |
Drone Systems and Applications |
container_volume |
10 |
container_issue |
1 |
container_start_page |
15 |
op_container_end_page |
25 |
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1779313156958453760 |