DOI: 10.1111/gcb.12339
论文题名: Variation in the response of an Arctic top predator experiencing habitat loss: Feeding and reproductive ecology of two polar bear populations
作者: Rode K.D. ; Regehr E.V. ; Douglas D.C. ; Durner G. ; Derocher A.E. ; Thiemann G.W. ; Budge S.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2014
卷: 20, 期: 1 起始页码: 76
结束页码: 88
语种: 英语
英文关键词: Body condition
; Body size
; Climate change
; Diet
; Feeding ecology
; Morphometrics
; Reproduction
; Ursus maritimus
Scopus关键词: bear
; body condition
; body size
; climate change
; climate effect
; feeding ecology
; habitat loss
; morphometry
; polar region
; predator
; reproductive behavior
; sea ice
; seasonal variation
; Arctic Ocean
; Beaufort Sea
; Bering Sea
; Chukchi Sea
; Pacific Ocean
; Ursus maritimus
; animal
; Arctic
; article
; bear
; body constitution
; body size
; climate change
; diet
; ecosystem
; feeding behavior
; feeding ecology
; female
; ice cover
; male
; morphometrics
; physiology
; polar bear
; reproduction
; sea
; Body condition
; body size
; climate change
; diet
; feeding ecology
; morphometrics
; reproduction
; Ursus maritimus
; Animals
; Arctic Regions
; Body Size
; Climate Change
; Diet
; Ecosystem
; Feeding Behavior
; Female
; Ice Cover
; Male
; Oceans and Seas
; Reproduction
; Ursidae
英文摘要: Polar bears (Ursus maritimus) have experienced substantial changes in the seasonal availability of sea ice habitat in parts of their range, including the Beaufort, Chukchi, and Bering Seas. In this study, we compared the body size, condition, and recruitment of polar bears captured in the Chukchi and Bering Seas (CS) between two periods (1986-1994 and 2008-2011) when declines in sea ice habitat occurred. In addition, we compared metrics for the CS population 2008-2011 with those of the adjacent southern Beaufort Sea (SB) population where loss in sea ice habitat has been associated with declines in body condition, size, recruitment, and survival. We evaluated how variation in body condition and recruitment were related to feeding ecology. Comparing habitat conditions between populations, there were twice as many reduced ice days over continental shelf waters per year during 2008-2011 in the SB than in the CS. CS polar bears were larger and in better condition, and appeared to have higher reproduction than SB bears. Although SB and CS bears had similar diets, twice as many bears were fasting in spring in the SB than in the CS. Between 1986-1994 and 2008-2011, body size, condition, and recruitment indices in the CS were not reduced despite a 44-day increase in the number of reduced ice days. Bears in the CS exhibited large body size, good body condition, and high indices of recruitment compared to most other populations measured to date. Higher biological productivity and prey availability in the CS relative to the SB, and a shorter recent history of reduced sea ice habitat, may explain the maintenance of condition and recruitment of CS bears. Geographic differences in the response of polar bears to climate change are relevant to range-wide forecasts for this and other ice-dependent species. © 2013 John Wiley & Sons Ltd.
Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62155
Appears in Collections: 影响、适应和脆弱性
There are no files associated with this item.
作者单位: Marine Mammals Management, U. S. Fish and Wildlife Service, 1011 E Tudor Road, Anchorage, AK 99502, United States; Alaska Science Center, U. S. Geological Survey, 250 Egan Drive, Juneau, AK 99801, United States; Alaska Science Center, U. S. Geological Survey, 4210 University Drive, Anchorage, AK 99508, United States; Department of Biological Sciences, University of Alberta, Edmonton, AB T6G 2E9, Canada; Faculty of Environmental Studies, York University, 4700 Keele Street, Toronto, ON M3J 1P3, Canada; Process Engineering and Applied Science, Dalhousie University, Halifax, NS B3J 2X4, Canada; Alaska Science Center, US Geological Survey, 4210 University Drive, Anchorage, AK 99508, United States
Recommended Citation:
Rode K.D.,Regehr E.V.,Douglas D.C.,et al. Variation in the response of an Arctic top predator experiencing habitat loss: Feeding and reproductive ecology of two polar bear populations[J]. Global Change Biology,2014-01-01,20(1)