Polar bears and seals in the eastern Beaufort Sea and Amundsen Gulf: A synthesis of population trends and ecological relationships over three decades. Arctic 55(Supp
ABSTRACT. In the eastern Beaufort Sea and Amundsen Gulf, research on polar bear populations and their ecological interrelationships with seals and sea ice conditions began in the fall of 1970. Analysis of movement data from mark-recapture studies and tracking of adult female bears with satellite rad...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.500.4462 2023-05-15T13:22:51+02:00 Polar bears and seals in the eastern Beaufort Sea and Amundsen Gulf: A synthesis of population trends and ecological relationships over three decades. Arctic 55(Supp Ian Stirling The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.500.4462 http://pubs.aina.ucalgary.ca/arctic/Arctic55-S-59.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.500.4462 http://pubs.aina.ucalgary.ca/arctic/Arctic55-S-59.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://pubs.aina.ucalgary.ca/arctic/Arctic55-S-59.pdf text ftciteseerx 2016-01-08T09:05:50Z ABSTRACT. In the eastern Beaufort Sea and Amundsen Gulf, research on polar bear populations and their ecological interrelationships with seals and sea ice conditions began in the fall of 1970. Analysis of movement data from mark-recapture studies and tracking of adult female bears with satellite radio collars indicated that there are two populations of polar bears in the area, one that inhabits the west coast of Banks Island and Amundsen Gulf and a second that is resident along the mainland coast from about Baillie Islands in Canada to approximately Icy Cape in Alaska. Polar bears throughout the Beaufort Sea and Amundsen Gulf were severely overharvested before the establishment of quotas in Canada in 1968 and the cessation of all but subsistence polar bear hunting in Alaska in 1972. Since then, both populations have recovered, and the population estimates currently used for management purposes are 1200 and 1800 for the Northern and Southern Beaufort populations, respectively. However, these population estimates are now dated and should be redone. Most female polar bears in the Beaufort Sea breed for the first time at 5 years of age, compared to 4 years of age in most other populations, and cubs normally remain with their mothers for 2.5 years prior to weaning. Heavy ice conditions in the mid-1970s and mid-1980s caused significant declines in productivity of ringed seals, each of which lasted about 3 years and caused similar declines in the natality of polar bears and survival of subadults, after which reproductive success and survival of both species increased again. The changes in the sea ice environment, and their consequent effects on polar bears, are demonstrable in parallel fluctuations in the mean ages of polar bears killed each year by Inuit hunters. In 1989, the decadal-scale pattern in fluctuations of ice conditions in the eastern Beaufort Sea changed in response to Text Amundsen Gulf Arctic Arctic Banks Island Beaufort Sea inuit Sea ice Alaska Unknown Arctic Baillie ENVELOPE(-128.013,-128.013,70.561,70.561) Baillie Islands ENVELOPE(-128.172,-128.172,70.583,70.583) Canada |
institution |
Open Polar |
collection |
Unknown |
op_collection_id |
ftciteseerx |
language |
English |
description |
ABSTRACT. In the eastern Beaufort Sea and Amundsen Gulf, research on polar bear populations and their ecological interrelationships with seals and sea ice conditions began in the fall of 1970. Analysis of movement data from mark-recapture studies and tracking of adult female bears with satellite radio collars indicated that there are two populations of polar bears in the area, one that inhabits the west coast of Banks Island and Amundsen Gulf and a second that is resident along the mainland coast from about Baillie Islands in Canada to approximately Icy Cape in Alaska. Polar bears throughout the Beaufort Sea and Amundsen Gulf were severely overharvested before the establishment of quotas in Canada in 1968 and the cessation of all but subsistence polar bear hunting in Alaska in 1972. Since then, both populations have recovered, and the population estimates currently used for management purposes are 1200 and 1800 for the Northern and Southern Beaufort populations, respectively. However, these population estimates are now dated and should be redone. Most female polar bears in the Beaufort Sea breed for the first time at 5 years of age, compared to 4 years of age in most other populations, and cubs normally remain with their mothers for 2.5 years prior to weaning. Heavy ice conditions in the mid-1970s and mid-1980s caused significant declines in productivity of ringed seals, each of which lasted about 3 years and caused similar declines in the natality of polar bears and survival of subadults, after which reproductive success and survival of both species increased again. The changes in the sea ice environment, and their consequent effects on polar bears, are demonstrable in parallel fluctuations in the mean ages of polar bears killed each year by Inuit hunters. In 1989, the decadal-scale pattern in fluctuations of ice conditions in the eastern Beaufort Sea changed in response to |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Ian Stirling |
spellingShingle |
Ian Stirling Polar bears and seals in the eastern Beaufort Sea and Amundsen Gulf: A synthesis of population trends and ecological relationships over three decades. Arctic 55(Supp |
author_facet |
Ian Stirling |
author_sort |
Ian Stirling |
title |
Polar bears and seals in the eastern Beaufort Sea and Amundsen Gulf: A synthesis of population trends and ecological relationships over three decades. Arctic 55(Supp |
title_short |
Polar bears and seals in the eastern Beaufort Sea and Amundsen Gulf: A synthesis of population trends and ecological relationships over three decades. Arctic 55(Supp |
title_full |
Polar bears and seals in the eastern Beaufort Sea and Amundsen Gulf: A synthesis of population trends and ecological relationships over three decades. Arctic 55(Supp |
title_fullStr |
Polar bears and seals in the eastern Beaufort Sea and Amundsen Gulf: A synthesis of population trends and ecological relationships over three decades. Arctic 55(Supp |
title_full_unstemmed |
Polar bears and seals in the eastern Beaufort Sea and Amundsen Gulf: A synthesis of population trends and ecological relationships over three decades. Arctic 55(Supp |
title_sort |
polar bears and seals in the eastern beaufort sea and amundsen gulf: a synthesis of population trends and ecological relationships over three decades. arctic 55(supp |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.500.4462 http://pubs.aina.ucalgary.ca/arctic/Arctic55-S-59.pdf |
long_lat |
ENVELOPE(-128.013,-128.013,70.561,70.561) ENVELOPE(-128.172,-128.172,70.583,70.583) |
geographic |
Arctic Baillie Baillie Islands Canada |
geographic_facet |
Arctic Baillie Baillie Islands Canada |
genre |
Amundsen Gulf Arctic Arctic Banks Island Beaufort Sea inuit Sea ice Alaska |
genre_facet |
Amundsen Gulf Arctic Arctic Banks Island Beaufort Sea inuit Sea ice Alaska |
op_source |
http://pubs.aina.ucalgary.ca/arctic/Arctic55-S-59.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.500.4462 http://pubs.aina.ucalgary.ca/arctic/Arctic55-S-59.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766367362967142400 |