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| DOI | 10.1002/ecy.4279 |
| Evolution of avian heat tolerance: The role of atmospheric humidity | |
| 发表日期 | 2024 |
| ISSN | 0012-9658 |
| EISSN | 1939-9170 |
| 起始页码 | 105 |
| 结束页码 | 5 |
| 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 |
| 语种 | 英语 |
| WOS研究方向 | Environmental Sciences & Ecology |
| WOS类目 | Ecology |
| WOS记录号 | WOS:001187043100001 |
| 来源期刊 | ECOLOGY
 |
| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/300911 |
| 作者单位 | South African National Biodiversity Institute; University of Pretoria; University of Cape Town |
| 推荐引用方式 GB/T 7714 | . Evolution of avian heat tolerance: The role of atmospheric humidity[J],2024,105(5). |
| APA | (2024).Evolution of avian heat tolerance: The role of atmospheric humidity.ECOLOGY,105(5). |
| MLA | "Evolution of avian heat tolerance: The role of atmospheric humidity".ECOLOGY 105.5(2024). |
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