Flexibility in metabolic rate confers a growth advantage under changing food availability

Auer, S. K., Salin, K., Rudolf, A. M. M., Anderson, G. J. and Metcalfe, N. B. (2015) Flexibility in metabolic rate confers a growth advantage under changing food availability. Journal of Animal Ecology, 84(5), pp. 1405-1411. (doi:10.1111/1365-2656.12384) (PMID:25939669)

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Abstract

Phenotypic flexibility in physiological, morphological and behavioural traits can allow organisms to cope with environmental challenges. Given recent climate change and the degree of habitat modification currently experienced by many organisms, it is therefore critical to quantify the degree of phenotypic variation present within populations, individual capacities to change and what their consequences are for fitness. Flexibility in standard metabolic rate (SMR) may be particularly important since SMR reflects the minimal energetic cost of living and is one of the primary traits underlying organismal performance. SMR can increase or decrease in response to food availability, but the consequences of these changes for growth rates and other fitness components are not well known. We examined individual variation in metabolic flexibility in response to changing food levels and its consequences for somatic growth in juvenile brown trout (Salmo trutta). SMR increased when individuals were switched to a high food ration and decreased when they were switched to a low food regime. These shifts in SMR, in turn, were linked with individual differences in somatic growth; those individuals that increased their SMR more in response to elevated food levels grew fastest, while growth at the low food level was fastest in those individuals that depressed their SMR most. Flexibility in energy metabolism is therefore a key mechanism to maximize growth rates under the challenges imposed by variability in food availability and is likely to be an important determinant of species’ resilience in the face of global change.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Rudolf, Ms Agata Marta and Anderson, Mr Graeme and Auer, Dr Sonya and Metcalfe, Professor Neil and Salin, Dr Karine
Authors: Auer, S. K., Salin, K., Rudolf, A. M. M., Anderson, G. J., and Metcalfe, N. B.
College/School:College of Medical Veterinary and Life Sciences > Institute of Biodiversity Animal Health and Comparative Medicine
Journal Name:Journal of Animal Ecology
Publisher:John Wiley & Sons Ltd.
ISSN:0021-8790
ISSN (Online):1365-2656
Copyright Holders:Copyright © 2015 The Authors
First Published:First published in Journal of Animal Ecology 84(5):1405-1411
Publisher Policy:Reproduced under a Creative Commons License

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