Arid
DOI10.1242/jeb.181420
Avian thermoregulation in the heat: is evaporative cooling more economical in nocturnal birds?
O’Connor, Ryan S.1; Smit, Ben2; Talbot, William A.3; Gerson, Alexander R.4; Brigham, R. Mark5; Wolf, Blair O.3; McKechnie, Andrew E.1,6
通讯作者McKechnie, Andrew E.
来源期刊JOURNAL OF EXPERIMENTAL BIOLOGY
ISSN0022-0949
EISSN1477-9145
出版年2018
卷号221期号:17
英文摘要

Evaporative cooling is a prerequisite for avian occupancy of hot, arid environments, and is the only avenue of heat dissipation when air temperatures (T-a) exceed body temperature (T-b). Whereas diurnal birds can potentially rehydrate throughout the day, nocturnal species typically forgo drinking between sunrise and sunset. We hypothesized that nocturnal birds have evolved reduced rates of evaporative water loss (EWL) and more economical evaporative cooling mechanisms compared with diurnal species, permitting nocturnal species to tolerate extended periods of intense heat without becoming lethally dehydrated. We used phylogenetically informed regressions to compare EWL and evaporative cooling efficiency [ratio of evaporative heat loss (EHL) and metabolic heat production (MHP); EHL/MHP] among nocturnal and diurnal birds at high T-a. We analyzed variation in three response variables: (1) slope of EWL at T-a between 40 and 46 degrees C, (2) EWL at T-a=46 degrees C and (3) EHU MHP at T-a=46 degrees C. Nocturnality emerged as a weak, negative predictor, with nocturnal species having slightly shallower slopes and reduced EWL compared with diurnal species of similar mass. In contrast, nocturnal activity was positively correlated with EHL/MHP, indicating a greater capacity for evaporative cooling in nocturnal birds. However, our analysis also revealed conspicuous differences among nocturnal taxa. Caprimulgids and Australian owlet-nightjars had shallower slopes and reduced EWL compared with similarly sized diurnal species, whereas owls had EWL rates comparable to those of diurnal species. Consequently, our results did not unequivocally demonstrate more economical cooling among nocturnal birds. Owls predominately select refugia with cooler microclimates, but the more frequent and intense heat waves forecast for the 21st century may increase microclimate temperatures and the necessity for active heat dissipation, potentially increasing owls’ vulnerability to dehydration and hyperthermia.


英文关键词Caprimulgiformes Dehydration tolerance Diurnal Evaporative water loss Heat tolerance Strigiformes
类型Article
语种英语
国家South Africa ; USA ; Canada
收录类别SCI-E
WOS记录号WOS:000444708600011
WOS关键词BASAL METABOLIC-RATE ; WATER-LOSS ; TEMPERATURE REGULATION ; DESERT BIRDS ; CLIMATE-CHANGE ; ENVIRONMENTAL TEMPERATURES ; STATISTICAL SIGNIFICANCE ; MORTALITY EVENTS ; SONORAN DESERT ; BODY-SIZE
WOS类目Biology
WOS研究方向Life Sciences & Biomedicine - Other Topics
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/210895
作者单位1.Univ Pretoria, Percy FitzPatrick Inst, Dept Zool & Entomol, DST NRF Ctr Excellence, Private Bag X20, ZA-0028 Hatfield, South Africa;
2.Rhodes Univ, Dept Zool & Entomol, POB 94, ZA-6140 Grahamstown, South Africa;
3.Univ New Mexico, Dept Biol, MSC03-2020, Albuquerque, NM 87131 USA;
4.Univ Massachusetts, Dept Biol, Amherst, MA 01003 USA;
5.Univ Regina, Dept Biol, Regina, SK S4S 0A2, Canada;
6.South African Natl Biodivers Inst, Natl Zool Garden, Conservat Physiol, POB 754, ZA-0001 Pretoria, South Africa
推荐引用方式
GB/T 7714
O’Connor, Ryan S.,Smit, Ben,Talbot, William A.,et al. Avian thermoregulation in the heat: is evaporative cooling more economical in nocturnal birds?[J],2018,221(17).
APA O’Connor, Ryan S..,Smit, Ben.,Talbot, William A..,Gerson, Alexander R..,Brigham, R. Mark.,...&McKechnie, Andrew E..(2018).Avian thermoregulation in the heat: is evaporative cooling more economical in nocturnal birds?.JOURNAL OF EXPERIMENTAL BIOLOGY,221(17).
MLA O’Connor, Ryan S.,et al."Avian thermoregulation in the heat: is evaporative cooling more economical in nocturnal birds?".JOURNAL OF EXPERIMENTAL BIOLOGY 221.17(2018).
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