Bowhead whale calf detections in the western Beaufort sea during the open water season, 2012–2019
Successful reproduction is essential to a species existence. Here we summarize Bering–Chukchi–Beaufort (BCB) bowhead whale (Balaena mysticetus Linnaeus, 1758) calf distribution, ratio of calf to adult sightings, and encounter rate from data collected during line–transect aerial surveys conducted fro...
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ftdoajarticles:oai:doaj.org/article:09df679dbe9c49e5ab4556bc4c4cfff0 2023-05-15T13:22:56+02:00 Bowhead whale calf detections in the western Beaufort sea during the open water season, 2012–2019 J.T. Clarke M.C. Ferguson S.R. Okkonen A.A. Brower A.L. Willoughby 2022-06-01T00:00:00Z https://doi.org/10.1139/as-2021-0020 https://doaj.org/article/09df679dbe9c49e5ab4556bc4c4cfff0 EN FR eng fre Canadian Science Publishing https://cdnsciencepub.com/doi/10.1139/as-2021-0020 https://doaj.org/toc/2368-7460 doi:10.1139/as-2021-0020 2368-7460 https://doaj.org/article/09df679dbe9c49e5ab4556bc4c4cfff0 Arctic Science, Vol 8, Iss 2, Pp 531-548 (2022) bowhead whale Bering–Chukchi–Beaufort seas calf ratio seasonality Pacific Arctic aerial survey Environmental sciences GE1-350 Environmental engineering TA170-171 article 2022 ftdoajarticles https://doi.org/10.1139/as-2021-0020 2022-12-31T02:45:35Z Successful reproduction is essential to a species existence. Here we summarize Bering–Chukchi–Beaufort (BCB) bowhead whale (Balaena mysticetus Linnaeus, 1758) calf distribution, ratio of calf to adult sightings, and encounter rate from data collected during line–transect aerial surveys conducted from July to October 2012–2019 in the western Beaufort Sea (140°W–157°W). During 223,000 on effort km, a total of 274 calves were seen: 100 in summer (July–August) and 174 in fall (September–October), compared with nearly 3,200 non-calves. Calves were widely distributed in the study area in August and September, with distribution in July largely east of 150°W and distribution in October west of 143°W. Calf ratios and encounter rates appear to follow a 3–4 year cycle. Most calves (240/274; 88%) were seen near an adult assumed to be the maternal female, but 9% (26/274) of all calves were observed unaccompanied at the surface and 3% (8/274) were observed with large whales at the surface but not close by. Of the total calves detected, 60% (165/274) were observed after circling was initiated, highlighting the importance of closely investigating all bowhead whale sightings if identification of calves is critical to project goals. Bowhead whale calf data from the eastern Beaufort Sea and Amundsen Gulf in August 2019 are also summarized. Article in Journal/Newspaper Amundsen Gulf Arctic Arctic Balaena mysticetus Beaufort Sea bowhead whale Chukchi Pacific Arctic Directory of Open Access Journals: DOAJ Articles Arctic Pacific Arctic Science 1 18 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English French |
topic |
bowhead whale Bering–Chukchi–Beaufort seas calf ratio seasonality Pacific Arctic aerial survey Environmental sciences GE1-350 Environmental engineering TA170-171 |
spellingShingle |
bowhead whale Bering–Chukchi–Beaufort seas calf ratio seasonality Pacific Arctic aerial survey Environmental sciences GE1-350 Environmental engineering TA170-171 J.T. Clarke M.C. Ferguson S.R. Okkonen A.A. Brower A.L. Willoughby Bowhead whale calf detections in the western Beaufort sea during the open water season, 2012–2019 |
topic_facet |
bowhead whale Bering–Chukchi–Beaufort seas calf ratio seasonality Pacific Arctic aerial survey Environmental sciences GE1-350 Environmental engineering TA170-171 |
description |
Successful reproduction is essential to a species existence. Here we summarize Bering–Chukchi–Beaufort (BCB) bowhead whale (Balaena mysticetus Linnaeus, 1758) calf distribution, ratio of calf to adult sightings, and encounter rate from data collected during line–transect aerial surveys conducted from July to October 2012–2019 in the western Beaufort Sea (140°W–157°W). During 223,000 on effort km, a total of 274 calves were seen: 100 in summer (July–August) and 174 in fall (September–October), compared with nearly 3,200 non-calves. Calves were widely distributed in the study area in August and September, with distribution in July largely east of 150°W and distribution in October west of 143°W. Calf ratios and encounter rates appear to follow a 3–4 year cycle. Most calves (240/274; 88%) were seen near an adult assumed to be the maternal female, but 9% (26/274) of all calves were observed unaccompanied at the surface and 3% (8/274) were observed with large whales at the surface but not close by. Of the total calves detected, 60% (165/274) were observed after circling was initiated, highlighting the importance of closely investigating all bowhead whale sightings if identification of calves is critical to project goals. Bowhead whale calf data from the eastern Beaufort Sea and Amundsen Gulf in August 2019 are also summarized. |
format |
Article in Journal/Newspaper |
author |
J.T. Clarke M.C. Ferguson S.R. Okkonen A.A. Brower A.L. Willoughby |
author_facet |
J.T. Clarke M.C. Ferguson S.R. Okkonen A.A. Brower A.L. Willoughby |
author_sort |
J.T. Clarke |
title |
Bowhead whale calf detections in the western Beaufort sea during the open water season, 2012–2019 |
title_short |
Bowhead whale calf detections in the western Beaufort sea during the open water season, 2012–2019 |
title_full |
Bowhead whale calf detections in the western Beaufort sea during the open water season, 2012–2019 |
title_fullStr |
Bowhead whale calf detections in the western Beaufort sea during the open water season, 2012–2019 |
title_full_unstemmed |
Bowhead whale calf detections in the western Beaufort sea during the open water season, 2012–2019 |
title_sort |
bowhead whale calf detections in the western beaufort sea during the open water season, 2012–2019 |
publisher |
Canadian Science Publishing |
publishDate |
2022 |
url |
https://doi.org/10.1139/as-2021-0020 https://doaj.org/article/09df679dbe9c49e5ab4556bc4c4cfff0 |
geographic |
Arctic Pacific |
geographic_facet |
Arctic Pacific |
genre |
Amundsen Gulf Arctic Arctic Balaena mysticetus Beaufort Sea bowhead whale Chukchi Pacific Arctic |
genre_facet |
Amundsen Gulf Arctic Arctic Balaena mysticetus Beaufort Sea bowhead whale Chukchi Pacific Arctic |
op_source |
Arctic Science, Vol 8, Iss 2, Pp 531-548 (2022) |
op_relation |
https://cdnsciencepub.com/doi/10.1139/as-2021-0020 https://doaj.org/toc/2368-7460 doi:10.1139/as-2021-0020 2368-7460 https://doaj.org/article/09df679dbe9c49e5ab4556bc4c4cfff0 |
op_doi |
https://doi.org/10.1139/as-2021-0020 |
container_title |
Arctic Science |
container_start_page |
1 |
op_container_end_page |
18 |
_version_ |
1766367979631542272 |