期刊
FUNCTIONAL ECOLOGY
卷 34, 期 8, 页码 1589-1600出版社
WILEY
DOI: 10.1111/1365-2435.13573
关键词
arid zone; birds; drinking behaviour; evaporative cooling; heat tolerance; metabolism; physiology; thermoregulation
类别
资金
- National Research Foundation [119754]
- DST-NRF Centre of Excellence at the FitzPatrick Institute
- National Science Foundation [IOS-1122228]
Surface water is a critical resource for many birds inhabiting arid regions, but the implications of regular drinking and dependence on surface water for the evolution of thermal physiology remain largely unexplored. We hypothesized that avian thermoregulation in the heat has evolved in tandem with the use of surface water and predicted that (a) regularly drinking species have a greater capacity to elevate rates of evaporative water loss (EWL) compared to non-drinking species, and (b) heat tolerance limits (HTLs) are higher among drinking species. To test these predictions, we quantified thermoregulatory responses to high air temperature (T-a) in 12 species of passerines from the South African arid zone and combined these with values for an additional five species. We categorized each species as either: (a) water-dependent, regularly drinking, or (b) water-independent, occasional-/non-drinking. In support of our predictions, both conventional and phylogenetically independent analyses revealed that evaporative scope (the ratio of maximum EWL to minimum thermoneutral EWL) during acute heat exposure was significantly higher among drinking species. Moreover, evaporative scope was significantly and positively related to HTL (i.e. maximum air temperature tolerated before the onset of severe hyperthermia). These findings offer new insights into the co-evolution of water dependence, movement ecology and thermal physiology in the context of trade-offs between dehydration avoidance and resistance to lethal hyperthermia in hot desert habitats. A free Plain Language Summary can be found within the Supporting Information of this article.
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