气候变化领域集成服务门户(CCPortal): Surviving winter on the Qinghai-Tibetan Plateau: Pikas suppress energy demands and exploit yak feces to survive winter

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DOI	10.1073/pnas.2100707118
	Surviving winter on the Qinghai-Tibetan Plateau: Pikas suppress energy demands and exploit yak feces to survive winter
	Speakman J.R.; Chi Q.; Ołdakowski Ł.; Fu H.; Fletcher Q.E.; Hambly C.; Togo J.; Liu X.; Piertney S.B.; Wang X.; Zhang L.; Redman P.; Wang L.; Tang G.; Li Y.; Cui J.; Thomson P.J.; Wang Z.; Glover P.; Robertson O.C.; Zhang Y.; Wang D.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:30
英文摘要	The Qinghai-Tibetan Plateau, with low precipitation, low oxygen partial pressure, and temperatures routinely dropping below −30 °C in winter, presents several physiological challenges to its fauna. Yet it is home to many endemic mammalian species, including the plateau pika (Ochotona curzoniae). How these small animals that are incapable of hibernation survive the winter is an enigma. Measurements of daily energy expenditure (DEE) using the doubly labeled water method show that pikas suppress their DEE during winter. At the same body weight, pikas in winter expend 29.7% less than in summer, despite ambient temperatures being approximately 25 °C lower. Combined with resting metabolic rates (RMRs), this gives them an exceptionally low metabolic scope in winter (DEE/RMRt = 1.60 ± 0.30; RMRt is resting metabolic rate at thermoneutrality). Using implanted body temperature loggers and filming in the wild, we show that this is achieved by reducing body temperature and physical activity. Thyroid hormone (T3 and T4) measurements indicate this metabolic suppression is probably mediated via the thyroid axis. Winter activity was lower at sites where domestic yak (Bos grunniens) densities were higher. Pikas supplement their food intake at these sites by eating yak feces, demonstrated by direct observation, identification of yak DNA in pika stomach contents, and greater convergence in the yak/pika microbiotas in winter. This interspecific coprophagy allows pikas to thrive where yak are abundant and partially explains why pika densities are higher where domestic yak, their supposed direct competitors for food, are more abundant. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Metabolic suppression; Thyroid axis; Winter survival
语种	英语
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238679
作者单位	State Key Laboratory of Molecular Developmental Biology, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, Beijing, 100101, China; State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing, 100101, China; Key Laboratory of Adaptation and Evolution of Plateau Biota, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Qinghai, 810001, China; School of Biological Sciences, University of Aberdeen, Aberdeen, AB24 3FX, United Kingdom; Faculty of Biology, University of Bialystok, Bialystok, 15-328, Poland; University of Chinese Academy of Sciences, Chinese Academy of Sciences, Beijing, 100101, China; Qinghai Key Laboratory of Animal Ecological Genomics, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining, 810008, China; Department of Biology, Centre for Forest Interdisciplinary Research, University of Winnipeg, Winnipeg, MB R3B 2E9, Canada; Chengdu Institute of Biology...
推荐引用方式 GB/T 7714	Speakman J.R.,Chi Q.,Ołdakowski Ł.,et al. Surviving winter on the Qinghai-Tibetan Plateau: Pikas suppress energy demands and exploit yak feces to survive winter[J],2021,118(30).
APA	Speakman J.R..,Chi Q..,Ołdakowski Ł..,Fu H..,Fletcher Q.E..,...&Wang D..(2021).Surviving winter on the Qinghai-Tibetan Plateau: Pikas suppress energy demands and exploit yak feces to survive winter.Proceedings of the National Academy of Sciences of the United States of America,118(30).
MLA	Speakman J.R.,et al."Surviving winter on the Qinghai-Tibetan Plateau: Pikas suppress energy demands and exploit yak feces to survive winter".Proceedings of the National Academy of Sciences of the United States of America 118.30(2021).