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Validating accelerometry-derived proxies of energy expenditure using the doubly-labelled water method in the smallest penguin species

Sutton, G. J., Botha, J. A., Speakman, J. R. and Arnould, J. P. Y. 2021, Validating accelerometry-derived proxies of energy expenditure using the doubly-labelled water method in the smallest penguin species, Biology Open, vol. 10, no. 4, pp. 1-10, doi: 10.1242/bio.055475.

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Title Validating accelerometry-derived proxies of energy expenditure using the doubly-labelled water method in the smallest penguin species
Author(s) Sutton, G. J.
Botha, J. A.
Speakman, J. R.
Arnould, J. P. Y.ORCID iD for Arnould, J. P. Y. orcid.org/0000-0003-1124-9330
Journal name Biology Open
Volume number 10
Issue number 4
Article ID bio055475
Start page 1
End page 10
Total pages 10
Publisher The Company of Biologists
Place of publication Cambridge, Eng.
Publication date 2021-03-15
ISSN 2046-6390
2046-6390
Keyword(s) Accelerometer
Bio-logging
Doubly labelled water
Energy expenditure
Penguin
Time-energy budget
Summary Understanding energy use is central to understanding an animal's physiological and behavioural ecology. However, directly measuring energy expenditure in free-ranging animals is inherently difficult. The doubly-labelled water (DLW) method is widely used to investigate energy expenditure in a range of taxa. Although reliable, DLW data collection and analysis is both financially costly and time consuming. Dynamic body acceleration (e.g. VeDBA) calculated from animal-borne accelerometers has been used to determine behavioural patterns, and is increasingly being used as a proxy for energy expenditure. Still its performance as a proxy for energy expenditure in free-ranging animals is not well established and requires validation against established methods. In the present study, the relationship between VeDBA and the at-sea metabolic rate calculated from DLW was investigated in little penguins (Eudyptula minor) using three approaches. Both in a simple correlation and activity-specific approaches were shown to be good predictors of at-sea metabolic rate. The third approach using activity-specific energy expenditure values obtained from literature did not accurately calculate the energy expended by individuals. However, all three approaches were significantly strengthened by the addition of mean horizontal travel speed. These results provide validation for the use of accelerometry as a proxy for energy expenditure and show how energy expenditure may be influenced by both individual behaviour and environmental conditions.
Language eng
DOI 10.1242/bio.055475
Indigenous content off
Field of Research 0699 Other Biological Sciences
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Free to Read? Yes
Persistent URL http://hdl.handle.net/10536/DRO/DU:30149546

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Every reasonable effort has been made to ensure that permission has been obtained for items included in DRO. If you believe that your rights have been infringed by this repository, please contact drosupport@deakin.edu.au.