Acceleration predicts energy expenditure in a fat, flightless, diving bird

Olivia Hicks, Akiko Kato, Frederic Angelier, Danuta M. Wisniewska, Catherine Hambly, John R. Speakman, Coline Marciau, Yan Ropert-Coudert

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Energy drives behaviour and life history decisions, yet it can be hard to measure at fine scales in free-moving animals. Accelerometry has proven a powerful tool to estimate energy expenditure, but requires calibration in the wild. This can be difficult in some environments, or for particular behaviours, and validations have produced equivocal results in some species, particularly air-breathing divers. It is, therefore, important to calibrate accelerometry across different behaviours to understand the most parsimonious way to estimate energy expenditure in free-living conditions. Here, we combine data from miniaturised acceleration loggers on 58 free-living Adélie penguins with doubly labelled water (DLW) measurements of their energy expenditure over several days. Across different behaviours, both in water and on land, dynamic body acceleration was a good predictor of independently measured DLW-derived energy expenditure (R 2 = 0.72). The most parsimonious model suggested different calibration coefficients are required to predict behaviours on land versus foraging behaviour in water (R 2 = 0.75). Our results show that accelerometry can be used to reliably estimate energy expenditure in penguins, and we provide calibration equations for estimating metabolic rate across several behaviours in the wild.

Original languageEnglish
Article number21493
JournalScientific Reports
Volume10
ISSN2045-2322
DOIs
Publication statusPublished - 9. Dec 2020
Externally publishedYes

Keywords

  • Acceleration
  • Accelerometry/methods
  • Animals
  • Birds/metabolism
  • Diving/physiology
  • Energy Metabolism/physiology
  • Female
  • Male
  • Spheniscidae/metabolism
  • Water

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