The rate of evaporative cooling was calculated from the rate of mass loss in starlings (Sturnus vulgaris) during 90 min flights in a wind-tunnel. Evaporative heat loss ranged from 5% of the metabolic rate at −5 degrees C to 19% of the metabolic rate at 29 degrees C. Radiation and convection accounted for the balance of the heat loss. On average, starlings dehydrated during flights at all temperatures above 7 degrees C. The comparison of these results with data from field studies, which indicate that long-distance migrants do not dehydrate, suggests that migrants may maintain water balance by ascending to colder air in which convection carries off most of the heat produced.
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JOURNAL ARTICLE| 01 August 1978
Evaporative cooling and water balance during flight in birds
J. R. Torre-Bueno
Online Issn: 1477-9145
Print Issn: 0022-0949
© 1978 by Company of Biologists
J Exp Biol (1978) 75 (1): 231–236.
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J. R. Torre-Bueno; Evaporative cooling and water balance during flight in birds. J Exp Biol 1 August 1978; 75 (1): 231–236. doi: https://doi.org/10.1242/jeb.75.1.231
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