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Energetics and metabolite profiles during early flight in American robins (Turdus Migratorius)

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Abstract

Although birds use fat as the primary fuel for migratory flights, carbohydrate and protein catabolism could be significant in the early stages of flight while pathways of fatty acid transport and oxidation are induced. The fuel mixture of long distance migrant birds can also be affected by the rate of water loss, where birds catabolize more protein to increase endogenous water production under dehydrating flight conditions. Despite many studies investigating flight metabolism, few have focused on the metabolic response to flight during the switchover to fat catabolism in migrants, and none have examined the effect of ambient conditions on fuel selection during early flight. We investigated the effect of water loss on the metabolic response to short duration flight in the American robin (Turdus migratorius). Birds were flown in a climatic wind tunnel and changes in body composition and plasma metabolites were measured. As flight duration increased, there was a gradual switchover from carbohydrate and protein catabolism to fat catabolism. Plasma metabolite profiles indicate that the mobilization of fat occurred within 20 min of initiating flight. Plasma glucose decreased and uric acid increased with flight duration. Ambient humidity did not affect fuel mixture. Thus, it seems that the utilization of fat may be delayed as migrants initiate flight. Short-hop migrants may exploit high rates of endogenous water production resulting from carbohydrate and protein catabolism early in flight to offset high water loss associated with low humidity. Rapid catabolism of lean body components at the start of a flight also reduces mass quickly, and may reduce energy costs.

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Acknowledgments

We thank Ulf Bauchinger and Stuart Mackenzie for help catching birds, and Catherine Duperrouzel for help with hand raising birds. A. R. Gerson was supported by a National Sciences and Engineering Research Council (NSERC) Alexander Graham Bell Canada Graduate Scholarship. This study was funded by an NSERC Discovery Grant to C. G. Guglielmo and by grants from the Canada Foundation for Innovation and Ontario Research Fund to C. G. Guglielmo and other colleagues.

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Correspondence to Alexander R. Gerson.

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Communicated by G. Heldmaier.

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Gerson, A.R., Guglielmo, C.G. Energetics and metabolite profiles during early flight in American robins (Turdus Migratorius) . J Comp Physiol B 183, 983–991 (2013). https://doi.org/10.1007/s00360-013-0767-y

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  • DOI: https://doi.org/10.1007/s00360-013-0767-y

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