干旱区生态环境知识资源中心(Arid): Heat tolerance and evaporative cooling capacity in an arid-zone elephant shrew

Arid

DOI	10.1007/s42991-024-00431-5
	Heat tolerance and evaporative cooling capacity in an arid-zone elephant shrew
	Chalwin-Milton, Olivia J. B.; Freeman, Marc T.; McKechnie, Andrew E.
通讯作者	McKechnie, AE
来源期刊	MAMMALIAN BIOLOGY
ISSN	1616-5047
EISSN	1618-1476
出版年	2024
英文摘要	Endotherms vary widely in their capacity to defend sublethal body temperature (T-b) during acute heat exposure. Interspecific variation in the upper thermal limits of small mammals remains poorly studied, particularly in taxa other than bats. We hypothesised that rupicolous elephant shrews (Macroscelidae), on account of their occupancy of above-ground rock crevices in hot habitats and rapid cursorial locomotion, have evolved pronounced heat tolerance capacities. To test this hypothesis, we quantified relationships between T-b, resting metabolic rate (RMR) and evaporative water loss (EWL) in western rock elephant shrews (Elephantulus rupestris) exposed to air temperature (T-air) approaching or exceeding T-b under conditions of low humidity representative of the study population's arid, winter-rainfall habitat in western South Africa. Our data revealed a pronounced capacity to tolerate T-air > T-b, with E. rupestris tolerating T-air up to 48.0 +/- 0.1 degrees C while defending T-b > 7 degrees C below T-air (maximum T-b = 41.64 +/- 0.16 degrees C). Three behavioural pathways were employed to dissipate heat: open mouth panting, flattening their body posture, and nose-licking. At the highest experimental T-air values achieved, EWL increased 15.05-fold relative to normothermic levels and heat was dissipated evaporatively at rates equivalent to 174%-240% of metabolic heat production. The heat tolerance limit of T-air = 48 degrees C in E. rupestris is one of the highest yet recorded in a non-volant small mammal, and our data support the notion that elephant shrews possess a pronounced capacity to avoid lethal hyperthermia during acute heat exposure.
英文关键词	Evaporation Heat dissipation behaviour Hyperthermia Macroscelidae Nose-licking Panting
类型	Article ; Early Access
语种	英语
开放获取类型	hybrid
收录类别	SCI-E
WOS记录号	WOS:001243646500001
WOS关键词	RETREAT-SITE SELECTION ; BODY-TEMPERATURE ; THERMOREGULATION ; BIRDS ; EVOLUTION ; RESPONSES ; TORPOR ; FLOW ; HOT
WOS类目	Zoology
WOS研究方向	Zoology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/404881
推荐引用方式 GB/T 7714	Chalwin-Milton, Olivia J. B.,Freeman, Marc T.,McKechnie, Andrew E.. Heat tolerance and evaporative cooling capacity in an arid-zone elephant shrew[J],2024.
APA	Chalwin-Milton, Olivia J. B.,Freeman, Marc T.,&McKechnie, Andrew E..(2024).Heat tolerance and evaporative cooling capacity in an arid-zone elephant shrew.MAMMALIAN BIOLOGY.
MLA	Chalwin-Milton, Olivia J. B.,et al."Heat tolerance and evaporative cooling capacity in an arid-zone elephant shrew".MAMMALIAN BIOLOGY (2024).