Aerobic scope explains individual variation in feeding capacity

Auer, S. K., Salin, K., Anderson, G. J. and Metcalfe, N. B. (2015) Aerobic scope explains individual variation in feeding capacity. Biology Letters, 11(11), 20150793. (doi:10.1098/rsbl.2015.0793) (PMID:26556902)

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Abstract

Links between metabolism and components of fitness such as growth, reproduction and survival can depend on food availability. A high standard metabolic rate (SMR; baseline energy expenditure) or aerobic scope (AS; the difference between an individual's maximum and SMR) is often beneficial when food is abundant or easily accessible but can be less important or even disadvantageous when food levels decline. While the mechanisms underlying these context-dependent associations are not well understood, they suggest that individuals with a higher SMR or AS are better able to take advantage of high food abundance. Here we show that juvenile brown trout (Salmo trutta) with a higher AS were able to consume more food per day relative to individuals with a lower AS. These results help explain why a high aerobic capacity can improve performance measures such as growth rate at high but not low levels of food availability.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Anderson, Mr Graeme and Auer, Dr Sonya and Metcalfe, Professor Neil and Salin, Dr Karine
Authors: Auer, S. K., Salin, K., 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:Biology Letters
Publisher:The Royal Society
ISSN:1744-9561
ISSN (Online):1744-957X
Copyright Holders:Copyright © 2015 The Authors
First Published:First published in Biology Letters 11(11):20150793
Publisher Policy:Reproduced under a Creative Commons License

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