Polar Bear Foraging Behavior During the Ice-Free Period in Western Hudson Bay: Observations, Origins, and Potential Significance
During much of the year, polar bears in western Hudson Bay use energy-conserving hunting tactics, such as still-hunting and stalking, to capture seals from sea-ice platforms. Such hunting allows these bears to accumulate a majority of the annual fat reserves that sustain them on land through the ice...
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American Museum of Natural History
2017
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Online Access: | https://doi.org/10.1206/3885.1 |
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ftbioone:10.1206/3885.1 2024-06-02T08:07:53+00:00 Polar Bear Foraging Behavior During the Ice-Free Period in Western Hudson Bay: Observations, Origins, and Potential Significance Linda J. Gormezano Susan N. Ellis-Felege David T. Iles Andrew Barnas Robert F. Rockwell Linda J. Gormezano Susan N. Ellis-Felege David T. Iles Andrew Barnas Robert F. Rockwell world 2017-10-24 text/HTML https://doi.org/10.1206/3885.1 en eng American Museum of Natural History doi:10.1206/3885.1 All rights reserved. https://doi.org/10.1206/3885.1 Text 2017 ftbioone https://doi.org/10.1206/3885.1 2024-05-07T01:03:04Z During much of the year, polar bears in western Hudson Bay use energy-conserving hunting tactics, such as still-hunting and stalking, to capture seals from sea-ice platforms. Such hunting allows these bears to accumulate a majority of the annual fat reserves that sustain them on land through the ice-free season. As climate change has led to earlier spring sea-ice breakup in western Hudson Bay, polar bears have less time to hunt seals, especially seal pups in their spring birthing lairs. Concerns have been raised as to whether this will lead to a shortfall in the bears' annual energy budget. Research based on scat analyses indicates that over the past 40 years at least some of these polar bears eat a variety of food during the ice-free season and are opportunistically taking advantage of a changing and increasing terrestrial prey base. Whether this food will offset anticipated shortfalls and whether land-based foraging will spread throughout the population is not yet known, and full resolution of the issues requires detailed physiological and genetic research. For insight on these issues, we present detailed observations on polar bears hunting without an ice platform. We compare the hunting tactics to those of polar bears using an ice platform and to those of the closely related grizzly bear. We examine how the techniques are related and explore how they may have evolved. We also discuss how they may contribute to polar bear adaptability in the face of climate change projections. Text Hudson Bay Sea ice BioOne Online Journals Hudson Hudson Bay American Museum Novitates 3885 3885 1 28 |
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English |
description |
During much of the year, polar bears in western Hudson Bay use energy-conserving hunting tactics, such as still-hunting and stalking, to capture seals from sea-ice platforms. Such hunting allows these bears to accumulate a majority of the annual fat reserves that sustain them on land through the ice-free season. As climate change has led to earlier spring sea-ice breakup in western Hudson Bay, polar bears have less time to hunt seals, especially seal pups in their spring birthing lairs. Concerns have been raised as to whether this will lead to a shortfall in the bears' annual energy budget. Research based on scat analyses indicates that over the past 40 years at least some of these polar bears eat a variety of food during the ice-free season and are opportunistically taking advantage of a changing and increasing terrestrial prey base. Whether this food will offset anticipated shortfalls and whether land-based foraging will spread throughout the population is not yet known, and full resolution of the issues requires detailed physiological and genetic research. For insight on these issues, we present detailed observations on polar bears hunting without an ice platform. We compare the hunting tactics to those of polar bears using an ice platform and to those of the closely related grizzly bear. We examine how the techniques are related and explore how they may have evolved. We also discuss how they may contribute to polar bear adaptability in the face of climate change projections. |
author2 |
Linda J. Gormezano Susan N. Ellis-Felege David T. Iles Andrew Barnas Robert F. Rockwell |
format |
Text |
author |
Linda J. Gormezano Susan N. Ellis-Felege David T. Iles Andrew Barnas Robert F. Rockwell |
spellingShingle |
Linda J. Gormezano Susan N. Ellis-Felege David T. Iles Andrew Barnas Robert F. Rockwell Polar Bear Foraging Behavior During the Ice-Free Period in Western Hudson Bay: Observations, Origins, and Potential Significance |
author_facet |
Linda J. Gormezano Susan N. Ellis-Felege David T. Iles Andrew Barnas Robert F. Rockwell |
author_sort |
Linda J. Gormezano |
title |
Polar Bear Foraging Behavior During the Ice-Free Period in Western Hudson Bay: Observations, Origins, and Potential Significance |
title_short |
Polar Bear Foraging Behavior During the Ice-Free Period in Western Hudson Bay: Observations, Origins, and Potential Significance |
title_full |
Polar Bear Foraging Behavior During the Ice-Free Period in Western Hudson Bay: Observations, Origins, and Potential Significance |
title_fullStr |
Polar Bear Foraging Behavior During the Ice-Free Period in Western Hudson Bay: Observations, Origins, and Potential Significance |
title_full_unstemmed |
Polar Bear Foraging Behavior During the Ice-Free Period in Western Hudson Bay: Observations, Origins, and Potential Significance |
title_sort |
polar bear foraging behavior during the ice-free period in western hudson bay: observations, origins, and potential significance |
publisher |
American Museum of Natural History |
publishDate |
2017 |
url |
https://doi.org/10.1206/3885.1 |
op_coverage |
world |
geographic |
Hudson Hudson Bay |
geographic_facet |
Hudson Hudson Bay |
genre |
Hudson Bay Sea ice |
genre_facet |
Hudson Bay Sea ice |
op_source |
https://doi.org/10.1206/3885.1 |
op_relation |
doi:10.1206/3885.1 |
op_rights |
All rights reserved. |
op_doi |
https://doi.org/10.1206/3885.1 |
container_title |
American Museum Novitates |
container_volume |
3885 |
container_issue |
3885 |
container_start_page |
1 |
op_container_end_page |
28 |
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1800753013896249344 |