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The scaling of carbon dioxide release and respiratory water loss in flying fruit flies (Drosophila spp.)

Lehmann, Fritz-Olaf and Dickinson, Michael H. and Staunton, Jocelyn (2000) The scaling of carbon dioxide release and respiratory water loss in flying fruit flies (Drosophila spp.). Journal of Experimental Biology, 203 (10). pp. 1613-1624. ISSN 0022-0949.

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By simultaneously measuring carbon dioxide release, water loss and flight force in several species of fruit flies in the genus Drosophila, we have investigated respiration and respiratory transpiration during elevated locomotor activity. We presented tethered flying flies with moving visual stimuli in a virtual flight arena, which induced them to vary both flight force and energetic output. In response to the visual motion, the flies altered their energetic output as measured by changes in carbon dioxide release and concomitant changes in respiratory water loss. We examined the effect of absolute body size on respiration and transpiration by studying four different-sized species of fruit flies. In resting flies, body-mass-specific CO(2) release and water loss tend to decrease more rapidly with size than predicted according to simple allometric relationships. During flight, the mass-specific metabolic rate decreases with increasing body size with an allometric exponent of -0.22, which is slightly lower than the scaling exponents found in other flying insects. In contrast, the mass-specific rate of water loss appears to be proportionately greater in small animals than can be explained by a simple allometric model for spiracular transpiration. Because fractional water content does not change significantly with increasing body size, the smallest species face not only larger mass-specific energetic expenditures during flight but also a higher risk of desiccation than their larger relatives. Fruit flies lower their desiccation risk by replenishing up to 75 % of the lost bulk water by metabolic water production, which significantly lowers the risk of desiccation for animals flying under xeric environmental conditions.

Item Type:Article
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Dickinson, Michael H.0000-0002-8587-9936
Additional Information:© The Company of Biologists Limited 2000. Accepted 9 March; published on WWW 18 April 2000. We would like to thank the two unknown referees for their helpful comments on this manuscript. This project was funded by a NSF grant IBN-9208765 (to M.H.D.) and a DFG grant GK200 (to F.-O.L.).
Funding AgencyGrant Number
Deutsche Forschungsgemeinschaft (DFG)GK200
Subject Keywords:carbon dioxide release; water loss; flight force; fruit Ay; Drosophila
Issue or Number:10
Record Number:CaltechAUTHORS:LEHjeb00
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13628
Deposited By: Tony Diaz
Deposited On:27 May 2009 21:37
Last Modified:03 Oct 2019 00:41

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