Significance of Autumn and Winter Food Consumption for Reproduction by Southern Beaufort Sea Polar Bears, Ursus Maritimus
Polar bears (Ursus maritimus) in the southern Beaufort Sea experience long annual periods when preferred seal prey are scarce or are unavailable. Consumption of bowhead whale (Balaena mysticetus) carcasses from native Alaskan subsistence hunting is increasingly common for onshore polar bears, yet th...
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ftolddominionuni:oai:digitalcommons.odu.edu:biology_fac_pubs-1508 2023-12-31T10:04:57+01:00 Significance of Autumn and Winter Food Consumption for Reproduction by Southern Beaufort Sea Polar Bears, Ursus Maritimus Griffen, Blaine D. Whiteman, John P. Pullan, Sariah 2022-01-01T08:00:00Z application/pdf https://digitalcommons.odu.edu/biology_fac_pubs/490 https://doi.org/10.1007/s00300-022-03066-9 https://digitalcommons.odu.edu/context/biology_fac_pubs/article/1508/viewcontent/Whiteman_2022_SignificanceofAutumnandWinterFoodConsumptionOCRed.pdf unknown ODU Digital Commons https://digitalcommons.odu.edu/biology_fac_pubs/490 doi:10.1007/s00300-022-03066-9 https://digitalcommons.odu.edu/context/biology_fac_pubs/article/1508/viewcontent/Whiteman_2022_SignificanceofAutumnandWinterFoodConsumptionOCRed.pdf This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0) , which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. Biological Sciences Faculty Publications Baleen whale carcass Optimal behavior Polar bear Seal equivalents Subsistence hunting Ursus maritimus Analysis Cetacea Ecology Ecology and Evolutionary Biology Microbiology Zoology article 2022 ftolddominionuni https://doi.org/10.1007/s00300-022-03066-9 2023-12-04T19:09:41Z Polar bears (Ursus maritimus) in the southern Beaufort Sea experience long annual periods when preferred seal prey are scarce or are unavailable. Consumption of bowhead whale (Balaena mysticetus) carcasses from native Alaskan subsistence hunting is increasingly common for onshore polar bears, yet the energetic consequences of this consumption remain unclear. We use data on bears captured repeatedly over periods that encompassed autumn and winter, combined with calculations, to show that adult female bears likely consume an average of at least 4 seal equivalents during both autumn and winter periods and that considerable variation in energy intake exists across individual bears. We further show that subsistence-caught whale carcasses provide an upper threshold of > 4000 seal equivalents, which could potentially meet mean consumption needs of ~ 80% of the southern Beaufort Sea bear subpopulation during autumn and winter periods. Finally, we modify an existing model to show that observed mass changes over autumn and winter could substantially alter spring foraging habitat choice by females with cubs and the chance that a female with reduced energy reserves would abort a pregnancy or abandon cubs in favor of increasing her own survival; these behaviors could potentially influence population vital rates. Our study highlights the importance of mass dynamics over the autumn and winter months, points to the need for additional data on foraging and energetics over this period, and indicates that the recent declines in polar bear body condition in some subpopulations could have complex effects on reproduction. Article in Journal/Newspaper Balaena mysticetus baleen whale Beaufort Sea bowhead whale Ursus maritimus Old Dominion University: ODU Digital Commons Polar Biology 45 8 1351 1362 |
institution |
Open Polar |
collection |
Old Dominion University: ODU Digital Commons |
op_collection_id |
ftolddominionuni |
language |
unknown |
topic |
Baleen whale carcass Optimal behavior Polar bear Seal equivalents Subsistence hunting Ursus maritimus Analysis Cetacea Ecology Ecology and Evolutionary Biology Microbiology Zoology |
spellingShingle |
Baleen whale carcass Optimal behavior Polar bear Seal equivalents Subsistence hunting Ursus maritimus Analysis Cetacea Ecology Ecology and Evolutionary Biology Microbiology Zoology Griffen, Blaine D. Whiteman, John P. Pullan, Sariah Significance of Autumn and Winter Food Consumption for Reproduction by Southern Beaufort Sea Polar Bears, Ursus Maritimus |
topic_facet |
Baleen whale carcass Optimal behavior Polar bear Seal equivalents Subsistence hunting Ursus maritimus Analysis Cetacea Ecology Ecology and Evolutionary Biology Microbiology Zoology |
description |
Polar bears (Ursus maritimus) in the southern Beaufort Sea experience long annual periods when preferred seal prey are scarce or are unavailable. Consumption of bowhead whale (Balaena mysticetus) carcasses from native Alaskan subsistence hunting is increasingly common for onshore polar bears, yet the energetic consequences of this consumption remain unclear. We use data on bears captured repeatedly over periods that encompassed autumn and winter, combined with calculations, to show that adult female bears likely consume an average of at least 4 seal equivalents during both autumn and winter periods and that considerable variation in energy intake exists across individual bears. We further show that subsistence-caught whale carcasses provide an upper threshold of > 4000 seal equivalents, which could potentially meet mean consumption needs of ~ 80% of the southern Beaufort Sea bear subpopulation during autumn and winter periods. Finally, we modify an existing model to show that observed mass changes over autumn and winter could substantially alter spring foraging habitat choice by females with cubs and the chance that a female with reduced energy reserves would abort a pregnancy or abandon cubs in favor of increasing her own survival; these behaviors could potentially influence population vital rates. Our study highlights the importance of mass dynamics over the autumn and winter months, points to the need for additional data on foraging and energetics over this period, and indicates that the recent declines in polar bear body condition in some subpopulations could have complex effects on reproduction. |
format |
Article in Journal/Newspaper |
author |
Griffen, Blaine D. Whiteman, John P. Pullan, Sariah |
author_facet |
Griffen, Blaine D. Whiteman, John P. Pullan, Sariah |
author_sort |
Griffen, Blaine D. |
title |
Significance of Autumn and Winter Food Consumption for Reproduction by Southern Beaufort Sea Polar Bears, Ursus Maritimus |
title_short |
Significance of Autumn and Winter Food Consumption for Reproduction by Southern Beaufort Sea Polar Bears, Ursus Maritimus |
title_full |
Significance of Autumn and Winter Food Consumption for Reproduction by Southern Beaufort Sea Polar Bears, Ursus Maritimus |
title_fullStr |
Significance of Autumn and Winter Food Consumption for Reproduction by Southern Beaufort Sea Polar Bears, Ursus Maritimus |
title_full_unstemmed |
Significance of Autumn and Winter Food Consumption for Reproduction by Southern Beaufort Sea Polar Bears, Ursus Maritimus |
title_sort |
significance of autumn and winter food consumption for reproduction by southern beaufort sea polar bears, ursus maritimus |
publisher |
ODU Digital Commons |
publishDate |
2022 |
url |
https://digitalcommons.odu.edu/biology_fac_pubs/490 https://doi.org/10.1007/s00300-022-03066-9 https://digitalcommons.odu.edu/context/biology_fac_pubs/article/1508/viewcontent/Whiteman_2022_SignificanceofAutumnandWinterFoodConsumptionOCRed.pdf |
genre |
Balaena mysticetus baleen whale Beaufort Sea bowhead whale Ursus maritimus |
genre_facet |
Balaena mysticetus baleen whale Beaufort Sea bowhead whale Ursus maritimus |
op_source |
Biological Sciences Faculty Publications |
op_relation |
https://digitalcommons.odu.edu/biology_fac_pubs/490 doi:10.1007/s00300-022-03066-9 https://digitalcommons.odu.edu/context/biology_fac_pubs/article/1508/viewcontent/Whiteman_2022_SignificanceofAutumnandWinterFoodConsumptionOCRed.pdf |
op_rights |
This article is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0) , which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. |
op_doi |
https://doi.org/10.1007/s00300-022-03066-9 |
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Polar Biology |
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45 |
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8 |
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1351 |
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1362 |
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