干旱区生态环境知识资源中心(Arid): Evolution of avian heat tolerance: The role of atmospheric humidity

Arid

DOI	10.1002/ecy.4279
	Evolution of avian heat tolerance: The role of atmospheric humidity
	Freeman, Marc; Coulson, Bianca; Short, James; Ngcamphalala, Celiwe; Makola, Mathome; Mckechnie, Andrew
通讯作者	Freeman, MT
来源期刊	ECOLOGY
ISSN	0012-9658
EISSN	1939-9170
出版年	2024
卷号	105 期号:5
英文摘要	The role of atmospheric humidity in the evolution of endotherms' thermoregulatory performance remains largely unexplored, despite the fact that elevated humidity is known to impede evaporative cooling capacity. Using a phylogenetically informed comparative framework, we tested the hypothesis that pronounced hyperthermia tolerance among birds occupying humid lowlands evolved to reduce the impact of humidity-impeded scope for evaporative heat dissipation by comparing heat tolerance limits (HTLs; maximum tolerable air temperature), maximum body temperatures (Tbmax), and associated thermoregulatory variables in humid (19.2 g H2O m-3) versus dry (1.1 g H2O m-3) air among 30 species from three climatically distinct sites (arid, mesic montane, and humid lowland). Humidity-associated decreases in evaporative water loss and resting metabolic rate were 27%-38% and 21%-27%, respectively, and did not differ significantly between sites. Decreases in HTLs were significantly larger among arid-zone (mean +/- SD = 3.13 +/- 1.12 degrees C) and montane species (2.44 +/- 1.0 degrees C) compared to lowland species (1.23 +/- 1.34 degrees C), with more pronounced hyperthermia among lowland (Tbmax = 46.26 +/- 0.48 degrees C) and montane birds (Tbmax = 46.19 +/- 0.92 degrees C) compared to arid-zone species (45.23 +/- 0.24 degrees C). Our findings reveal a functional link between facultative hyperthermia and humidity-related constraints on evaporative cooling, providing novel insights into how hygric and thermal environments interact to constrain avian performance during hot weather. Moreover, the macrophysiological patterns we report provide further support for the concept of a continuum from thermal specialization to thermal generalization among endotherms, with adaptive variation in body temperature correlated with prevailing climatic conditions.
英文关键词	birds body temperature endotherm evaporative water loss heat tolerance limit humidity hyperthermia thermoregulation
类型	Article
语种	英语
开放获取类型	Green Published, hybrid
收录类别	SCI-E
WOS记录号	WOS:001187043100001
WOS关键词	BASAL METABOLIC-RATE ; EVAPORATIVE WATER-LOSS ; CLIMATE-CHANGE ; ADAPTIVE THERMOREGULATION ; BIRDS ; TEMPERATURE ; CONSEQUENCES ; PATTERNS
WOS类目	Ecology
WOS研究方向	Environmental Sciences & Ecology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/403451
推荐引用方式 GB/T 7714	Freeman, Marc,Coulson, Bianca,Short, James,et al. Evolution of avian heat tolerance: The role of atmospheric humidity[J],2024,105(5).
APA	Freeman, Marc,Coulson, Bianca,Short, James,Ngcamphalala, Celiwe,Makola, Mathome,&Mckechnie, Andrew.(2024).Evolution of avian heat tolerance: The role of atmospheric humidity.ECOLOGY,105(5).
MLA	Freeman, Marc,et al."Evolution of avian heat tolerance: The role of atmospheric humidity".ECOLOGY 105.5(2024).