气候变化领域集成服务门户(CCPortal): Summer declines in activity and body temperature offer polar bears limited energy savings

CCPortal

DOI	10.1126/science.aaa8623
	Summer declines in activity and body temperature offer polar bears limited energy savings
	Whiteman J.P.; Harlow H.J.; Durner G.M.; Anderson-Sprecher R.; Albeke S.E.; Regehr E.V.; Amstrup S.C.; Ben-David M.
发表日期	2015
ISSN	0036-8075
起始页码	295
结束页码	298
卷号	349 期号:6245
英文摘要	Polar bears (Ursus maritimus) summer on the sea ice or, where it melts, on shore. Although the physiology of "ice" bears in summer is unknown, "shore" bears purportedly minimize energy losses by entering a hibernation-like state when deprived of food. Such a strategy could partially compensate for the loss of on-ice foraging opportunities caused by climate change. However, here we report gradual, moderate declines in activity and body temperature of both shore and ice bears in summer, resembling energy expenditures typical of fasting, nonhibernating mammals. Also, we found that to avoid unsustainable heat loss while swimming, bears employed unusual heterothermy of the body core. Thus, although well adapted to seasonal ice melt, polar bears appear susceptible to deleterious declines in body condition during the lengthening period of summer food deprivation.
英文关键词	bear; body condition; body temperature; climate change; food limitation; hibernation; physiological response; summer; swimming; Article; body constitution; body temperature; climate change; diet restriction; energy conservation; energy expenditure; food deprivation; heat loss; nonhuman; polar bear; priority journal; summer; swimming; animal; bear; climate change; energy metabolism; female; hibernation; ice cover; male; metabolism; physiology; season; Mammalia; Ursus maritimus; Animals; Body Temperature; Climate Change; Energy Metabolism; Female; Hibernation; Ice Cover; Male; Seasons; Ursidae
语种	英语
来源期刊	Science
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/246015
作者单位	Program in Ecology, University of Wyoming, Laramie, WY 82071, United States; Department of Zoology and Physiology, University of Wyoming, Laramie, WY 82071, United States; U.S. Geological Survey, Alaska Science Center, Anchorage, AK 99508, United States; Department of Statistics, University of Wyoming, Laramie, WY 82071, United States; Wyoming Geographic Information Science Center, University of Wyoming, Laramie, WY 82071, United States; Marine Mammals Management, U.S. Fish and Wildlife Service, Anchorage, AK 99503, United States; Polar Bears International, Bozeman, MT 59772, United States
推荐引用方式 GB/T 7714	Whiteman J.P.,Harlow H.J.,Durner G.M.,et al. Summer declines in activity and body temperature offer polar bears limited energy savings[J],2015,349(6245).
APA	Whiteman J.P..,Harlow H.J..,Durner G.M..,Anderson-Sprecher R..,Albeke S.E..,...&Ben-David M..(2015).Summer declines in activity and body temperature offer polar bears limited energy savings.Science,349(6245).
MLA	Whiteman J.P.,et al."Summer declines in activity and body temperature offer polar bears limited energy savings".Science 349.6245(2015).