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

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 assump...

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Autores principales:	Eleanor R. Dickinson, Philip A. Stephens, Nikki J. Marks, Rory P. Wilson, David M. Scantlebury
Formato:	article
Lenguaje:	EN
Publicado:	BMC 2021
Materias:	Rate of oxygen consumption Pygmy goat Tri-axial accelerometry Indirect calorimetry Locomotion Resting energy expenditure Ecology QH540-549.5 Animal biochemistry QP501-801
Acceso en línea:	https://doaj.org/article/17a8516d1d6d45efac1f31cbb101d8ec
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spelling	oai:doaj.org-article:17a8516d1d6d45efac1f31cbb101d8ec2021-11-28T12:38:22ZBehaviour, temperature and terrain slope impact estimates of energy expenditure using oxygen and dynamic body acceleration10.1186/s40317-021-00269-52050-3385https://doaj.org/article/17a8516d1d6d45efac1f31cbb101d8ec2021-11-01T00:00:00Zhttps://doi.org/10.1186/s40317-021-00269-5https://doaj.org/toc/2050-3385Abstract 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 ( $${\dot{\text{V}}\text{O}}_{2}$$ V ˙ O 2 ) 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 $${\dot{\text{V}}\text{O}}_{2}$$ V ˙ O 2 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 $${\dot{\text{V}}\text{O}}_{2}$$ V ˙ O 2 . During rest, energy expenditure increased below 22 °C and above 30.5 °C. $${\dot{\text{V}}\text{O}}_{2}$$ V ˙ O 2 (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.Eleanor R. DickinsonPhilip A. StephensNikki J. MarksRory P. WilsonDavid M. ScantleburyBMCarticleRate of oxygen consumptionPygmy goatTri-axial accelerometryIndirect calorimetryLocomotionResting energy expenditureEcologyQH540-549.5Animal biochemistryQP501-801ENAnimal Biotelemetry, Vol 9, Iss 1, Pp 1-14 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Rate of oxygen consumption Pygmy goat Tri-axial accelerometry Indirect calorimetry Locomotion Resting energy expenditure Ecology QH540-549.5 Animal biochemistry QP501-801
spellingShingle	Rate of oxygen consumption Pygmy goat Tri-axial accelerometry Indirect calorimetry Locomotion Resting energy expenditure Ecology QH540-549.5 Animal biochemistry QP501-801 Eleanor R. Dickinson Philip A. Stephens Nikki J. Marks Rory P. Wilson David M. Scantlebury Behaviour, temperature and terrain slope impact estimates of energy expenditure using oxygen and dynamic body acceleration
description	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 ( $${\dot{\text{V}}\text{O}}_{2}$$ V ˙ O 2 ) 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 $${\dot{\text{V}}\text{O}}_{2}$$ V ˙ O 2 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 $${\dot{\text{V}}\text{O}}_{2}$$ V ˙ O 2 . During rest, energy expenditure increased below 22 °C and above 30.5 °C. $${\dot{\text{V}}\text{O}}_{2}$$ V ˙ O 2 (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.
format	article
author	Eleanor R. Dickinson Philip A. Stephens Nikki J. Marks Rory P. Wilson David M. Scantlebury
author_facet	Eleanor R. Dickinson Philip A. Stephens Nikki J. Marks Rory P. Wilson David M. Scantlebury
author_sort	Eleanor R. Dickinson
title	Behaviour, temperature and terrain slope impact estimates of energy expenditure using oxygen and dynamic body acceleration
title_short	Behaviour, temperature and terrain slope impact estimates of energy expenditure using oxygen and dynamic body acceleration
title_full	Behaviour, temperature and terrain slope impact estimates of energy expenditure using oxygen and dynamic body acceleration
title_fullStr	Behaviour, temperature and terrain slope impact estimates of energy expenditure using oxygen and dynamic body acceleration
title_full_unstemmed	Behaviour, temperature and terrain slope impact estimates of energy expenditure using oxygen and dynamic body acceleration
title_sort	behaviour, temperature and terrain slope impact estimates of energy expenditure using oxygen and dynamic body acceleration
publisher	BMC
publishDate	2021
url	https://doaj.org/article/17a8516d1d6d45efac1f31cbb101d8ec
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Behaviour, temperature and terrain slope impact estimates of energy expenditure using oxygen and dynamic body acceleration

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