Moving towards acceleration for estimates of activity-specific metabolic rate in free-living animals: The case of the cormorant

Wilson, Rory P., White, Craig R., Quintana, Flavio, Halsey, Lewis G., Liebsch, Nikolai, Martin, Graham R. and Butler, Patrick J. (2006) Moving towards acceleration for estimates of activity-specific metabolic rate in free-living animals: The case of the cormorant. Journal of Animal Ecology, 75 5: 1081-1090. doi:10.1111/j.1365-2656.2006.01127.x

Author Wilson, Rory P.
White, Craig R.
Quintana, Flavio
Halsey, Lewis G.
Liebsch, Nikolai
Martin, Graham R.
Butler, Patrick J.
Title Moving towards acceleration for estimates of activity-specific metabolic rate in free-living animals: The case of the cormorant
Journal name Journal of Animal Ecology   Check publisher's open access policy
ISSN 0021-8790
Publication date 2006-09
Sub-type Article (original research)
DOI 10.1111/j.1365-2656.2006.01127.x
Volume 75
Issue 5
Start page 1081
End page 1090
Total pages 10
Place of publication Oxford, United Kingdom
Publisher Wiley-Blackwell Publishing
Language eng
Formatted abstract
1. Time and energy are key currencies in animal ecology, and judicious management of these is a primary focus for natural selection. At present, however, there are only two main methods for estimation of rate of energy expenditure in the field, heart rate and doubly labelled water, both of which have been used with success; but both also have their limitations.
2. The deployment of data loggers that measure acceleration is emerging as a powerful tool for quantifying the behaviour of free-living animals. Given that animal movement requires the use of energy, the accelerometry technique potentially has application in the quantification of rate of energy expenditure during activity.
3. In the present study, we test the hypothesis that acceleration can serve as a proxy for rate of energy expenditure in free-living animals. We measured rate of energy expenditure as rates of O2 consumption (V̇O2) and CO2 production (V̇CO2) in great cormorants (Phalacrocorax carbo) at rest and during pedestrian exercise. V̇O2 and V̇CO2 were then related to overall dynamic body acceleration (ODBA) measured with an externally attached three-axis accelerometer.
4. Both V̇O2 and V̇CO2 were significantly positively associated with ODBA in great cormorants. This suggests that accelerometric measurements of ODBA can be used to estimate V̇O2 and V̇CO2 and, with some additional assumptions regarding metabolic substrate use and the energy equivalence of O2 and CO2, that ODBA can be used to estimate the activity specific rate of energy expenditure of free-living cormorants.
5. To verify that the approach identifies expected trends in V̇O2 from situations with variable power requirements, we measured ODBA in free-living imperial cormorants (Phalacrocorax atriceps) during foraging trips. We compared ODBA during return and outward foraging flights, when birds are expected to be laden and not laden with captured fish, respectively. We also examined changes in ODBA during the descent phase of diving, when power requirements are predicted to decrease with depth due to changes in buoyancy associated with compression of plumage and respiratory air.
6. In free-living imperial cormorants, ODBA, and hence estimated V̇O2, was higher during the return flight of a foraging bout, and decreased with depth during the descent phase of a dive, supporting the use of accelerometry for the determination of activity-specific rate of energy expenditure.
Keyword Heart rate
Doubly-labelled water
Dynamic acceleration
Energy expenditure
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
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School of Biological Sciences Publications
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Created: Fri, 28 Mar 2008, 15:35:55 EST