Counting calories in cormorants

dynamic body acceleration predicts daily energy expenditure measured in pelagic cormorants

Mason R Stothart, Kyle H Elliott, Thomas Wood, Scott A Hatch, John R Speakman

Research output: Contribution to journalArticle

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Abstract

The integral of the dynamic component of acceleration over time has been proposed as a measure of energy expenditure in wild animals. We tested that idea by attaching accelerometers to free-ranging pelagic cormorants (Phalacrocorax pelagicus) and simultaneously estimating energy expenditure using doubly-labelled water. Two different formulations of dynamic body acceleration, VeDBA and ODBA, correlated with mass specific energy expenditure (both R(2)=0.91). VeDBA models combining and separately parameterizing flying, diving, activity on land and surface swimming were consistently considered more parsimonious than time budget models and showed less variability in model fit. Additionally, we observed provisional evidence for the presence of hypometabolic processes (i.e. reduced heart rate and body temperature; shunting of blood away from non-essential organs) that suppressed metabolism in cormorants while diving, which was the most metabolically important activity. We concluded that a combination of VeDBA and physiological processes accurately measured energy expenditure for cormorants.

Original languageEnglish
Pages (from-to)2192-2200
Number of pages9
JournalJournal of Experimental Biology
Volume219
Issue number14
Early online date19 May 2016
DOIs
Publication statusPublished - 15 Jul 2016

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Phalacrocorax
energy expenditure
Energy Metabolism
expenditure
Diving
diving
energy
Physiological Phenomena
specific energy
Wild Animals
accelerometer
body temperature
Budgets
wild animals
Body Temperature
heart rate
flight
Heart Rate
metabolism
blood

Keywords

  • doubly-labelled water
  • accelerometry
  • field metabolic rate

Cite this

Counting calories in cormorants : dynamic body acceleration predicts daily energy expenditure measured in pelagic cormorants. / Stothart, Mason R; Elliott, Kyle H; Wood, Thomas; Hatch, Scott A; Speakman, John R.

In: Journal of Experimental Biology, Vol. 219, No. 14, 15.07.2016, p. 2192-2200.

Research output: Contribution to journalArticle

Stothart, Mason R ; Elliott, Kyle H ; Wood, Thomas ; Hatch, Scott A ; Speakman, John R. / Counting calories in cormorants : dynamic body acceleration predicts daily energy expenditure measured in pelagic cormorants. In: Journal of Experimental Biology. 2016 ; Vol. 219, No. 14. pp. 2192-2200.
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AB - The integral of the dynamic component of acceleration over time has been proposed as a measure of energy expenditure in wild animals. We tested that idea by attaching accelerometers to free-ranging pelagic cormorants (Phalacrocorax pelagicus) and simultaneously estimating energy expenditure using doubly-labelled water. Two different formulations of dynamic body acceleration, VeDBA and ODBA, correlated with mass specific energy expenditure (both R(2)=0.91). VeDBA models combining and separately parameterizing flying, diving, activity on land and surface swimming were consistently considered more parsimonious than time budget models and showed less variability in model fit. Additionally, we observed provisional evidence for the presence of hypometabolic processes (i.e. reduced heart rate and body temperature; shunting of blood away from non-essential organs) that suppressed metabolism in cormorants while diving, which was the most metabolically important activity. We concluded that a combination of VeDBA and physiological processes accurately measured energy expenditure for cormorants.

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