No Cover Image

Journal article 103 views 31 downloads

Behaviour, temperature and terrain slope impact estimates of energy expenditure using oxygen and dynamic body acceleration

Eleanor R. Dickinson, Philip A. Stephens, Nikki J. Marks, Rory Wilson Orcid Logo, David M. Scantlebury

Animal Biotelemetry, Volume: 9, Issue: 1, Start page: 47

Swansea University Author: Rory Wilson Orcid Logo

  • 58857.pdf

    PDF | Version of Record

    © The Author(s) 2021. This article is licensed under a Creative Commons Attribution 4.0 International License

    Download (1.62MB)

Abstract

The energy used by animals is influenced by intrinsic (e.g. physiological) and extrinsic (e.g. environmental) factors. Accelerometers within biologging devices have proven useful for assessing energy expenditures and their behavioural context in free-ranging animals. However, certain assumptions are...

Full description

Published in: Animal Biotelemetry
ISSN: 2050-3385
Published: Springer Science and Business Media LLC 2021
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa58857
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: The energy used by animals is influenced by intrinsic (e.g. physiological) and extrinsic (e.g. environmental) factors. Accelerometers within biologging devices have proven useful for assessing energy expenditures and their behavioural context in free-ranging animals. However, certain assumptions are frequently made when acceleration is used as a proxy for energy expenditure, with factors, such as environmental variation (e.g. ambient temperature or slope of terrain), seldom accounted for. To determine the possible interactions between behaviour, energy expenditure and the environment (ambient temperature and terrain slope), the rate of oxygen consumption (V˙O2) was measured in pygmy goats (Capra hircus aegarus) using open-flow indirect calorimetry. The effect of temperature (9.7–31.5 °C) on resting energy expenditure was measured. The relationship between V˙O2 and dynamic body acceleration (DBA) was measured at different walking speeds (0.8–3.0 km h−1) and on different inclines (0, + 15°, − 15°). The daily behaviour of individuals was measured in two enclosures: enclosure A (level terrain during summer) and enclosure B (sloped terrain during winter) and per diem energy expenditures of behaviours estimated using behaviour, DBA, temperature, terrain slope and V˙O2. During rest, energy expenditure increased below 22 °C and above 30.5 °C. V˙O2 (ml min−1) increased with DBA when walking on the level. Walking uphill (+ 15°) increased energetic costs three-fold, whereas walking downhill (− 15°) increased energetic costs by one third. Based on these results, although activity levels were higher in animals in enclosure A during summer, energy expenditure was found to be significantly higher in the sloped enclosure B in winter (means of enclosures A and B: 485.3 ± 103.6 kJ day−1 and 744.5 ± 132.4 kJ day−1). We show that it is essential to account for extrinsic factors when calculating animal energy budgets. Our estimates of the impacts of extrinsic factors should be applicable to other free ranging ungulates.
Keywords: Rate of oxygen consumption, Pygmy goat, Tri-axial accelerometry, Indirect calorimetry, Locomotion, Resting energy expenditure, Thermoneutral zone
College: College of Science
Issue: 1
Start Page: 47