Two independent approaches to assessing the constancy of evaporative water loss for birds under varying evaporative conditions

被引:2
|
作者
Gilson, Lauren Noelle [1 ]
Cooper, Christine Elizabeth [1 ]
Withers, Philip Carew [1 ,2 ]
Gagnon, Marthe Monique [1 ]
机构
[1] Curtin Univ, Sch Mol & Life Sci, POB U1987, Perth, WA 6845, Australia
[2] Univ Western Australia, Sch Biol Sci, 35 Stirling Hwy, Crawley, WA 6009, Australia
基金
澳大利亚研究理事会;
关键词
Evaporative water loss; Helox; Water vapour pressure; Humidity; Temperature; Metabolism; Thermoregulation; Physiological control; VENTILATORY ACCOMMODATION; OXYGEN-CONSUMPTION; RELATIVE-HUMIDITY; VAPOR PRESSURE; TEMPERATURE; DIFFUSION; METABOLISM; RESPONSES; AIR; HOMEOTHERMS;
D O I
10.1016/j.cbpa.2021.111041
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
We examine here the effects on evaporative water loss, at and below thermoneutrality, of perturbing the evaporative environment for the red-capped parrot (Purpureicephalus spurius) by modifying the ambient relative humidity or the diffusive properties of the ambient environment using a helium-oxygen mix (helox). We found that evaporative water loss did not change with relative humidity at an ambient temperature of 30 degrees C, but there was a negative relationship for evaporative water loss with relative humidity at 20 and 25 degrees C. The evaporative water loss per water vapour pressure deficit between the bird and its ambient environment was not constant with relative humidity, as would be expected for a physical effect (slope = 0); rather there was a significant positive relationship with relative humidity at ambient temperatures of 25 and 30 degrees C. Consequently, we conclude that the red-capped parrot can physiologically control its EWL over a range of relative humidities. For the first time for a bird species, we also confirmed EWL control using a second methodology to perturb the evaporative environment, and demonstrated that a more diffusive helox atmosphere has no effect on evaporative water loss of live birds, but evaporative water loss was higher for dead birds in helox compared to air. Our results for evaporative water loss and other physiological variables for red-capped parrots are consistent with the hypothesis that evaporative water loss is under physiological control.
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页数:6
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