干旱区生态环境知识资源中心(Arid): Reaction norms for heat tolerance and evaporative cooling capacity do not vary across a climatic gradient in a passerine bird

Arid

DOI	10.1016/j.cbpa.2019.06.022
	Reaction norms for heat tolerance and evaporative cooling capacity do not vary across a climatic gradient in a passerine bird
	Noakes, Matthew J.1; McKechnie, Andrew E.1,2
通讯作者	McKechnie, Andrew E.
来源期刊	COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
ISSN	1095-6433
EISSN	1531-4332
出版年	2019
卷号	236
英文摘要	There is increasing evidence for considerable phenotypic flexibility in endotherm thermal physiology, a phenomenon with far-reaching implications for the evolution of traits related to heat tolerance. Numerous studies have documented intraspecific variation in avian thermoregulatory traits, but few have revealed the shapes of thermoregulatory reaction norms or how these might vary among populations. We investigated phenotypic flexibility in the ability of a model Afrotropical passerine bird (the white-browed sparrow-weaver, Plocepasser mahali) to handle high air temperatures (T-a). We allocated birds from three sites varying by similar to 11 degrees C in mean daily summer maximum T-a to three acclimation temperature (T-accl) treatments (daytime T-accl approximate to 30 degrees C, 36 degrees C or 42 degrees C respectively; n approximate to 10 per site per T-accl). After an acclimation period of 30 days, heat tolerance and evaporative cooling capacity was quantified by exposing birds to progressively higher T-a until they approached severe hyperthermia (body temperature [T-b] = 44.5 degrees C; T-a range: 38-54 degrees C). We measured metabolic rate and evaporative water loss using open flow-through respirometry, and T-b using temperature-sensitive passive-integrated transponder tags. Hyperthermia threshold T-a (T-a,T-HT) was significantly higher and T-b significantly lower in birds acclimated to the hottest T-accl compared to those from milder acclimation treatments. Population (i.e., site of capture) was not a significant predictor of any thermoregulatory variables or hyperthermia threshold T-a(T-a,(HT)) after acclimation, revealing that the shape of reaction norms for heat tolerance and evaporative cooling capacity does not vary among these three populations.
英文关键词	Phenotypic flexibility Reaction norms Acclimation Heat tolerance Heat stress, hyperthermia Evaporative water loss Arid-zone birds Passerine
类型	Article
语种	英语
国家	South Africa
收录类别	SCI-E
WOS记录号	WOS:000484647300004
WOS关键词	BASAL METABOLIC-RATE ; WATER-LOSS ; PHENOTYPIC FLEXIBILITY ; AVIAN THERMOREGULATION ; ADAPTIVE THERMOREGULATION ; SIBERIAN HAMSTERS ; RESPONSES ; LARKS ; TEMPERATURES ; POPULATIONS
WOS类目	Biochemistry & Molecular Biology ; Physiology ; Zoology
WOS研究方向	Biochemistry & Molecular Biology ; Physiology ; Zoology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/214949
作者单位	1.Univ Pretoria, DST NRF Ctr Excellence FitzPatrick Inst, Dept Zool & Entomol, ZA-0002 Pretoria, South Africa; 2.South African Natl Biodivers Inst, Natl Zool Garden, South African Res Chair Conservat Physiol, Pretoria, South Africa
推荐引用方式 GB/T 7714	Noakes, Matthew J.,McKechnie, Andrew E.. Reaction norms for heat tolerance and evaporative cooling capacity do not vary across a climatic gradient in a passerine bird[J],2019,236.
APA	Noakes, Matthew J.,&McKechnie, Andrew E..(2019).Reaction norms for heat tolerance and evaporative cooling capacity do not vary across a climatic gradient in a passerine bird.COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY,236.
MLA	Noakes, Matthew J.,et al."Reaction norms for heat tolerance and evaporative cooling capacity do not vary across a climatic gradient in a passerine bird".COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY 236(2019).