干旱区生态环境知识资源中心(Arid): Precocious Torpor in an Altricial Mammal and the Functional Implications of Heterothermy During Development

Arid

DOI	10.3389/fphys.2019.00469
	Precocious Torpor in an Altricial Mammal and the Functional Implications of Heterothermy During Development
	Geiser, Fritz 1,2; Wen, Jing 1; Sukhchuluun, Gansukh 1,3; Chi, Qing-Sheng 1; Wang, De-Hua 1,4
通讯作者	Chi, Qing-Sheng ; Wang, De-Hua
来源期刊	FRONTIERS IN PHYSIOLOGY
ISSN	1664-042X
出版年	2019
卷号	10
英文摘要	Most mammals and birds are altricial, small and naked at birth/hatching. They attain endothermic thermoregulation at a fraction of their adult size at a vulnerable stage with high heat loss when many could profit from using torpor for energy conservation. Nevertheless, detailed data on the interrelations between torpor expression and development of endothermic thermoregulation are currently restricted to <0.1% of extant endotherms. We investigated at what age and body mass (BM) desert hamsters (Phodopus roborovskii), wild-caught in Inner Mongolia and born in autumn/early winter when environmental temperatures in the wild begin to decrease, are able to defend their body temperature (T-b) at an ambient temperature (T-a) of similar to 21 degrees C and how soon thereafter they could express torpor. Measurements of surface temperatures via infrared thermometer and thermal camera show that although neonate hamsters (BM 0.9 +/- 0.1 g) cooled rapidly to near T-a, already on day 15 (BM 5.5 +/- 0.2 g) they could defend a high and constant T-b. As soon as day 16 (BM 5.8 +/- 0.2 g), when their maximum activity metabolism (measured as oxygen consumption) approached maxima measured in vertebrates, animals were able to enter torpor for several hours with a reduction of metabolism by >90%, followed by endothermic arousal. Over the next weeks, torpor depth and duration decreased together with a reduction in resting metabolic rate at T-a 30-32 degrees C. Our data show that development of endothermy and torpor expression in this altricial hamster is extremely fast. The results suggest that precocious torpor by juvenile hamsters in autumn and winter is an important survival tool in their vast and harsh Asian desert habitats, but likely also for many other small mammals and birds worldwide.
英文关键词	Asia desert hamsters (Phodopus roborovskii) heterothermy altricial body temperature metabolic rate torpor
类型	Article
语种	英语
国家	Peoples R China ; Australia ; Mongolia
开放获取类型	gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000465670800001
WOS关键词	BODY-TEMPERATURE ; THERMOREGULATION ; HIBERNATION ; ENDOTHERMY ; EXPRESSION ; COST
WOS类目	Physiology
WOS研究方向	Physiology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215818
作者单位	1.Chinese Acad Sci, Inst Zool, State Key Lab Integrated Management Pest Insects, Beijing, Peoples R China; 2.Univ New England, Ctr Behav & Physiol Ecol, Zool, Armidale, NSW, Australia; 3.Mongolian Acad Sci, Inst Gen & Expt Biol, Mammalian Ecol Lab, Ulaanbaatar, Mongolia; 4.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式 GB/T 7714	Geiser, Fritz,Wen, Jing,Sukhchuluun, Gansukh,et al. Precocious Torpor in an Altricial Mammal and the Functional Implications of Heterothermy During Development[J],2019,10.
APA	Geiser, Fritz,Wen, Jing,Sukhchuluun, Gansukh,Chi, Qing-Sheng,&Wang, De-Hua.(2019).Precocious Torpor in an Altricial Mammal and the Functional Implications of Heterothermy During Development.FRONTIERS IN PHYSIOLOGY,10.
MLA	Geiser, Fritz,et al."Precocious Torpor in an Altricial Mammal and the Functional Implications of Heterothermy During Development".FRONTIERS IN PHYSIOLOGY 10(2019).