Exploring key issues of aerobic scope interpretation in ectotherms: absolute versus factorial

Halsey, L. G., Killen, S. S. , Clark, T. D. and Norin, T. (2018) Exploring key issues of aerobic scope interpretation in ectotherms: absolute versus factorial. Reviews in Fish Biology and Fisheries, 28(2), pp. 405-415. (doi: 10.1007/s11160-018-9516-3)

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Aerobic scope represents an animal’s capacity to increase its aerobic metabolic rate above maintenance levels (i.e. the difference between standard (SMR) and maximum (MMR) metabolic rates). Aerobic scope data can be presented in absolute or factorial terms (AAS or FAS, respectively). However, the robustness of these calculations to noise or variability in measures of metabolic rate can influence subsequent interpretations of patterns in the data. We explored this issue using simple models and we compared the predictions from these models to experimental data from the literature. First, we investigated the robustness of aerobic scope calculations as a function of varying SMR when MMR is fixed, and vice versa. While FAS is unexpectedly robust to variability in SMR, even in species with low aerobic scopes, AAS is less sensitive to variation in SMR than is FAS. However, where variation in MMR is the main concern, FAS is more robust than AAS. Our findings highlight the equal importance of minimising variability in MMR, rather than just the variability in SMR, to obtain robust aerobic scope estimates. Second, we analysed metabolic rate accounting for locomotor speed and body mass for swimming fish. The interactions among these factors in relation to AAS and FAS are complex and the appropriate metric is dependent on the specific eco-physiological context of the research question. We conclude with qualified recommendations for using and interpreting AAS and FAS.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Killen, Professor Shaun and Norin, Dr Tommy
Authors: Halsey, L. G., Killen, S. S., Clark, T. D., and Norin, T.
College/School:College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
Journal Name:Reviews in Fish Biology and Fisheries
ISSN (Online):1573-5184
Published Online:15 March 2018
Copyright Holders:Copyright © 2018 The Authors
First Published:First published in Reviews in Fish Biology and Fisheries 28(2):405-415
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
594261The Influence of Individual Physiology on Group Behaviour in Fish SchoolsShaun KillenNatural Environment Research Council (NERC)NE/J019100/1RI BIODIVERSITY ANIMAL HEALTH & COMPMED