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Journal of Experimental Biology, Vol 203, Issue 10 1561-1572, Copyright © 2000 by Company of Biologists

JOURNAL ARTICLES

The energetic cost of short flights in birds

RL Nudds and DM Bryant
Department of Biological Sciences, University of Stirling, Stirling FK9 4LA, UK. robert.nudds@zoology.oxford.ac.uk.

Many small birds perform short flights, for which take-offs, ascents and descents form a large component of the total flight time and which are characterised by low airspeeds. Using the doubly-labelled water technique, zebra finches Taeniopygia guttata engaging in repeated short flights were found to expend 13.65 kJ more than 'non-flying' controls, which equated to a flight expenditure of 27.8 times their basal metabolic rate. This is over three times the predicted flight expenditure derived from existing aerodynamic models. These data were used to determine a coefficient (0.11) for converting the mechanical power derived from aerodynamic models into metabolic power. An equation is presented, based on body mass, which can be used to predict the costs of short flights in ecological and behavioural studies of birds.




© The Company of Biologists Ltd 2000