The number and distribution of polar bears in the western Barents Sea area.
Polar bears have experienced a rapid loss of sea-ice habitat in the Barents Sea. Monitoring this subpopulation focuses on the effects on polar bear demography. In August 2015, we conducted a survey in the Norwegian Arctic to estimate polar bear numbers and reveal population substructure. DNA profile...
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Language: | English |
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Norsk Polarinstitutt, Oslo
2018
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Online Access: | http://hdl.handle.net/10852/65137 http://urn.nb.no/URN:NBN:no-67667 https://doi.org/10.1080/17518369.2017.1374125 |
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ftoslouniv:oai:www.duo.uio.no:10852/65137 2023-05-15T15:09:38+02:00 The number and distribution of polar bears in the western Barents Sea area. Aars, Jon Marques, T.A. Lone, K. Andersen, M. Wiig, Øystein Fløystad, I.M.B. Hagen, S.B. Buckland, S.T. 2018-01-02T07:45:21Z http://hdl.handle.net/10852/65137 http://urn.nb.no/URN:NBN:no-67667 https://doi.org/10.1080/17518369.2017.1374125 EN eng Norsk Polarinstitutt, Oslo http://urn.nb.no/URN:NBN:no-67667 Aars, Jon Marques, T.A. Lone, K. Andersen, M. Wiig, Øystein Fløystad, I.M.B. Hagen, S.B. Buckland, S.T. . The number and distribution of polar bears in the western Barents Sea area. Polar Research. 2017, 36(1), 1-15 http://hdl.handle.net/10852/65137 1533374 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Polar Research&rft.volume=36&rft.spage=1&rft.date=2017 Polar Research 36 1 15 http://dx.doi.org/10.1080/17518369.2017.1374125 URN:NBN:no-67667 Fulltext https://www.duo.uio.no/bitstream/handle/10852/65137/1/2017%2BThe%2Bnumber%2Band%2Bdistribution%2Bof%2Bpolar%2Bbears.pdf Attribution-NonCommercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/ CC-BY-NC 0800-0395 Journal article Tidsskriftartikkel Peer reviewed PublishedVersion 2018 ftoslouniv https://doi.org/10.1080/17518369.2017.1374125 2020-06-21T08:51:42Z Polar bears have experienced a rapid loss of sea-ice habitat in the Barents Sea. Monitoring this subpopulation focuses on the effects on polar bear demography. In August 2015, we conducted a survey in the Norwegian Arctic to estimate polar bear numbers and reveal population substructure. DNA profiles from biopsy samples and ear tags identified on photographs revealed that about half of the bears in Svalbard, compared to only 4.5% in the pack ice north of the archipelago, were recognized recaptures. The recaptured bears had originally been marked in Svalbard, mostly in spring. The existence of a local Svalbard stock, and another ecotype of bears using the pack ice in autumn with low likelihood of visiting Svalbard, support separate population size estimation for the two areas. Mainly by aerial survey line transect distance sampling methods, we estimated that 264 (95% CI = 199 – 363) bears were in Svalbard, close to 241 bears estimated for August 2004. The pack ice area had an estimated 709 bears (95% CI = 334 – 1026). The pack ice and the total (Svalbard + pack ice, 973 bears, 95% CI = 665 – 1884) both had higher estimates compared to August 2004 (444 and 685 bears, respectively), but the increase was not significant. There is no evidence that the fast reduction of sea-ice habitat in the area has yet led to a reduction in population size. The carrying capacity is likely reduced significantly, but recovery from earlier depletion up to 1973 may still be ongoing. Article in Journal/Newspaper Arctic Barents Sea Polar Research Sea ice Svalbard Universitet i Oslo: Digitale utgivelser ved UiO (DUO) Arctic Svalbard Barents Sea Polar Research 36 1 1374125 |
institution |
Open Polar |
collection |
Universitet i Oslo: Digitale utgivelser ved UiO (DUO) |
op_collection_id |
ftoslouniv |
language |
English |
description |
Polar bears have experienced a rapid loss of sea-ice habitat in the Barents Sea. Monitoring this subpopulation focuses on the effects on polar bear demography. In August 2015, we conducted a survey in the Norwegian Arctic to estimate polar bear numbers and reveal population substructure. DNA profiles from biopsy samples and ear tags identified on photographs revealed that about half of the bears in Svalbard, compared to only 4.5% in the pack ice north of the archipelago, were recognized recaptures. The recaptured bears had originally been marked in Svalbard, mostly in spring. The existence of a local Svalbard stock, and another ecotype of bears using the pack ice in autumn with low likelihood of visiting Svalbard, support separate population size estimation for the two areas. Mainly by aerial survey line transect distance sampling methods, we estimated that 264 (95% CI = 199 – 363) bears were in Svalbard, close to 241 bears estimated for August 2004. The pack ice area had an estimated 709 bears (95% CI = 334 – 1026). The pack ice and the total (Svalbard + pack ice, 973 bears, 95% CI = 665 – 1884) both had higher estimates compared to August 2004 (444 and 685 bears, respectively), but the increase was not significant. There is no evidence that the fast reduction of sea-ice habitat in the area has yet led to a reduction in population size. The carrying capacity is likely reduced significantly, but recovery from earlier depletion up to 1973 may still be ongoing. |
format |
Article in Journal/Newspaper |
author |
Aars, Jon Marques, T.A. Lone, K. Andersen, M. Wiig, Øystein Fløystad, I.M.B. Hagen, S.B. Buckland, S.T. |
spellingShingle |
Aars, Jon Marques, T.A. Lone, K. Andersen, M. Wiig, Øystein Fløystad, I.M.B. Hagen, S.B. Buckland, S.T. The number and distribution of polar bears in the western Barents Sea area. |
author_facet |
Aars, Jon Marques, T.A. Lone, K. Andersen, M. Wiig, Øystein Fløystad, I.M.B. Hagen, S.B. Buckland, S.T. |
author_sort |
Aars, Jon |
title |
The number and distribution of polar bears in the western Barents Sea area. |
title_short |
The number and distribution of polar bears in the western Barents Sea area. |
title_full |
The number and distribution of polar bears in the western Barents Sea area. |
title_fullStr |
The number and distribution of polar bears in the western Barents Sea area. |
title_full_unstemmed |
The number and distribution of polar bears in the western Barents Sea area. |
title_sort |
number and distribution of polar bears in the western barents sea area. |
publisher |
Norsk Polarinstitutt, Oslo |
publishDate |
2018 |
url |
http://hdl.handle.net/10852/65137 http://urn.nb.no/URN:NBN:no-67667 https://doi.org/10.1080/17518369.2017.1374125 |
geographic |
Arctic Svalbard Barents Sea |
geographic_facet |
Arctic Svalbard Barents Sea |
genre |
Arctic Barents Sea Polar Research Sea ice Svalbard |
genre_facet |
Arctic Barents Sea Polar Research Sea ice Svalbard |
op_source |
0800-0395 |
op_relation |
http://urn.nb.no/URN:NBN:no-67667 Aars, Jon Marques, T.A. Lone, K. Andersen, M. Wiig, Øystein Fløystad, I.M.B. Hagen, S.B. Buckland, S.T. . The number and distribution of polar bears in the western Barents Sea area. Polar Research. 2017, 36(1), 1-15 http://hdl.handle.net/10852/65137 1533374 info:ofi/fmt:kev:mtx:ctx&ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Polar Research&rft.volume=36&rft.spage=1&rft.date=2017 Polar Research 36 1 15 http://dx.doi.org/10.1080/17518369.2017.1374125 URN:NBN:no-67667 Fulltext https://www.duo.uio.no/bitstream/handle/10852/65137/1/2017%2BThe%2Bnumber%2Band%2Bdistribution%2Bof%2Bpolar%2Bbears.pdf |
op_rights |
Attribution-NonCommercial 4.0 International https://creativecommons.org/licenses/by-nc/4.0/ |
op_rightsnorm |
CC-BY-NC |
op_doi |
https://doi.org/10.1080/17518369.2017.1374125 |
container_title |
Polar Research |
container_volume |
36 |
container_issue |
1 |
container_start_page |
1374125 |
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1766340790465855488 |