The influence of climate variability on polar bear ( Ursus maritimus ) and ringed seal ( Pusa hispida ) population dynamics
Unusually high polar bear ( Ursus maritimus Phipps, 1774) predation on ringed seal ( Pusa hispida (Schreber, 1775)) pups and increased survival of polar bear cubs during mild springs is documented in published articles. Strong predation on newborn ringed seal pups in early spring, however, is likely...
Published in: | Canadian Journal of Zoology |
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Online Access: | https://curis.ku.dk/portal/da/publications/the-influence-of-climate-variability-on-polar-bear-ursus-maritimus-and-ringed-seal-pusa-hispida-population-dynamics(b0f44ec0-74c2-11db-bee9-02004c4f4f50).html https://doi.org/10.1139/Z06-001 |
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ftcopenhagenunip:oai:pure.atira.dk:publications/b0f44ec0-74c2-11db-bee9-02004c4f4f50 2023-06-18T03:40:26+02:00 The influence of climate variability on polar bear ( Ursus maritimus ) and ringed seal ( Pusa hispida ) population dynamics Rosing-Asvid, A. 2006 https://curis.ku.dk/portal/da/publications/the-influence-of-climate-variability-on-polar-bear-ursus-maritimus-and-ringed-seal-pusa-hispida-population-dynamics(b0f44ec0-74c2-11db-bee9-02004c4f4f50).html https://doi.org/10.1139/Z06-001 eng eng info:eu-repo/semantics/restrictedAccess Rosing-Asvid , A 2006 , ' The influence of climate variability on polar bear ( Ursus maritimus ) and ringed seal ( Pusa hispida ) population dynamics ' , Canadian Journal of Zoology , vol. 84 , no. 3 , pp. 357-364 . https://doi.org/10.1139/Z06-001 article 2006 ftcopenhagenunip https://doi.org/10.1139/Z06-001 2023-06-07T23:04:09Z Unusually high polar bear ( Ursus maritimus Phipps, 1774) predation on ringed seal ( Pusa hispida (Schreber, 1775)) pups and increased survival of polar bear cubs during mild springs is documented in published articles. Strong predation on newborn ringed seal pups in early spring, however, is likely to lower the overall energy intake of polar bears if ringed seal pups are their main food, because the energetic value of ringed seal pups increases 7-8 times during the 6 week lactation period. So although hunting success in early spring increases cub survival during the period after den emergence,when they are most vulnerable, it is likely to increase the number of starving bears later in the season. This negative-feedback effect of strong spring predation will not occur in areas where other seal species are abundant during summer, and polar bears in such areas are likely to exhibit population growth during periods with milder springs, at least until the ringed seal population has been depleted. Long time series of population estimates that can be used to test this hypothesis do not exist, but it is strongly supported by catch statistics for polar bears and ringed seals from east Greenland. Article in Journal/Newspaper East Greenland Greenland Pusa hispida ringed seal Ursus maritimus University of Copenhagen: Research Greenland Canadian Journal of Zoology 84 3 357 364 |
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Open Polar |
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University of Copenhagen: Research |
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ftcopenhagenunip |
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English |
description |
Unusually high polar bear ( Ursus maritimus Phipps, 1774) predation on ringed seal ( Pusa hispida (Schreber, 1775)) pups and increased survival of polar bear cubs during mild springs is documented in published articles. Strong predation on newborn ringed seal pups in early spring, however, is likely to lower the overall energy intake of polar bears if ringed seal pups are their main food, because the energetic value of ringed seal pups increases 7-8 times during the 6 week lactation period. So although hunting success in early spring increases cub survival during the period after den emergence,when they are most vulnerable, it is likely to increase the number of starving bears later in the season. This negative-feedback effect of strong spring predation will not occur in areas where other seal species are abundant during summer, and polar bears in such areas are likely to exhibit population growth during periods with milder springs, at least until the ringed seal population has been depleted. Long time series of population estimates that can be used to test this hypothesis do not exist, but it is strongly supported by catch statistics for polar bears and ringed seals from east Greenland. |
format |
Article in Journal/Newspaper |
author |
Rosing-Asvid, A. |
spellingShingle |
Rosing-Asvid, A. The influence of climate variability on polar bear ( Ursus maritimus ) and ringed seal ( Pusa hispida ) population dynamics |
author_facet |
Rosing-Asvid, A. |
author_sort |
Rosing-Asvid, A. |
title |
The influence of climate variability on polar bear ( Ursus maritimus ) and ringed seal ( Pusa hispida ) population dynamics |
title_short |
The influence of climate variability on polar bear ( Ursus maritimus ) and ringed seal ( Pusa hispida ) population dynamics |
title_full |
The influence of climate variability on polar bear ( Ursus maritimus ) and ringed seal ( Pusa hispida ) population dynamics |
title_fullStr |
The influence of climate variability on polar bear ( Ursus maritimus ) and ringed seal ( Pusa hispida ) population dynamics |
title_full_unstemmed |
The influence of climate variability on polar bear ( Ursus maritimus ) and ringed seal ( Pusa hispida ) population dynamics |
title_sort |
influence of climate variability on polar bear ( ursus maritimus ) and ringed seal ( pusa hispida ) population dynamics |
publishDate |
2006 |
url |
https://curis.ku.dk/portal/da/publications/the-influence-of-climate-variability-on-polar-bear-ursus-maritimus-and-ringed-seal-pusa-hispida-population-dynamics(b0f44ec0-74c2-11db-bee9-02004c4f4f50).html https://doi.org/10.1139/Z06-001 |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
East Greenland Greenland Pusa hispida ringed seal Ursus maritimus |
genre_facet |
East Greenland Greenland Pusa hispida ringed seal Ursus maritimus |
op_source |
Rosing-Asvid , A 2006 , ' The influence of climate variability on polar bear ( Ursus maritimus ) and ringed seal ( Pusa hispida ) population dynamics ' , Canadian Journal of Zoology , vol. 84 , no. 3 , pp. 357-364 . https://doi.org/10.1139/Z06-001 |
op_rights |
info:eu-repo/semantics/restrictedAccess |
op_doi |
https://doi.org/10.1139/Z06-001 |
container_title |
Canadian Journal of Zoology |
container_volume |
84 |
container_issue |
3 |
container_start_page |
357 |
op_container_end_page |
364 |
_version_ |
1769005485667647488 |