Seasonal variation in thermal energetics of the Australian owlet-nightjar (Aegotheles cristatus)

Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology
Lisa I Doucette, F Geiser

Abstract

Many birds living in regions with seasonal fluctuations in ambient temperatures (T(a)) typically respond to cold by increasing insulation and adjusting metabolic rate. Seasonal variation in thermal physiology has not been studied for the Caprimulgiformes, an order of birds that generally have basal metabolic rates (BMR) lower than predicted for their body mass. We measured the metabolic rate and thermal conductance of Australian owlet-nightjars (Aegotheles cristatus) during summer and winter using open-flow respirometry. Within the thermoneutral zone (TNZ; 31.3 to 34.8 degrees C), there was no seasonal difference in BMR or thermal conductance (C), but body temperature was higher in summer- (38.2+/-0.3 degrees C) than winter-acclimatized (37.1+/-0.5 degrees C) birds. Below the TNZ, resting metabolic rate (RMR) increased linearly with decreasing T(a), and RMR and C were higher for summer- than winter-acclimatized birds. The mean mass-specific BMR of owlet-nightjars (1.27 mL O(2) g(-1) h(-1)) was close to the allometrically predicted value for a 45 g Caprimulgiformes, but well below that predicted for birds overall. These results suggest that owlet-nightjars increase plumage insulation to cope with low winter T(a), which is reflec...Continue Reading

References

Jan 1, 1977·Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology·P C Withers
Jul 1, 1973·Comparative Biochemistry and Physiology. A, Comparative Physiology·H Pohl, G C West
Jan 1, 1983·Comparative Biochemistry and Physiology. A, Comparative Physiology·B G Collins, P Briffa
Aug 26, 1998·Molecular Ecology·R GriffithsR J Dawson
May 3, 2000·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·F Geiser, R M Brigham
Nov 14, 2000·Physiological and Biochemical Zoology : PBZ·R M BrighamF Geiser
Jul 7, 2001·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·E Schleucher, P C Withers
Sep 27, 2002·Physiological and Biochemical Zoology : PBZ·Sheldon J Cooper
Feb 20, 2003·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·F Geiser, R L Drury
May 14, 2003·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·W A ButtemerA Sharman
Apr 22, 2006·Proceedings. Biological Sciences·Andrew E McKechnieWalter Jetz
Feb 1, 2002·Integrative and Comparative Biology·Theunis Piersma
Jan 1, 1979·Oecologia·Wesley W Weathers
Jan 1, 1978·Oecologia·Wesley W Weathers, Donald F Caccamise

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Citations

Aug 23, 2011·Die Naturwissenschaften·Lisa I DoucetteFritz Geiser
Sep 23, 2014·Physiological and Biochemical Zoology : PBZ·Wei-Hong ZhengXing-Jun Xu
Nov 5, 2016·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Ryan S O'ConnorAndrew E McKechnie
Aug 2, 2017·The Journal of Experimental Biology·William A TalbotBlair O Wolf
Apr 9, 2009·Journal of Comparative Physiology. B, Biochemical, Systemic, and Environmental Physiology·Andreas NordJan-Ake Nilsson
Dec 15, 2015·American Journal of Physiology. Regulatory, Integrative and Comparative Physiology·Li-Meng ZhouJin-Song Liu
Jul 10, 2012·The Journal of Experimental Biology·M A VersteeghB I Tieleman

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