Inadequate food intake at high temperatures is related to depressed mitochondrial respiratory capacity

Salin, K., Auer, S. K., Anderson, G. J., Selman, C. and Metcalfe, N. B. (2016) Inadequate food intake at high temperatures is related to depressed mitochondrial respiratory capacity. Journal of Experimental Biology, 219(9), pp. 1356-1362. (doi:10.1242/jeb.133025) (PMID:26944497)

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Abstract

Animals, especially ectotherms, are highly sensitive to the temperature of their surrounding environment. Extremely high temperature, for example, induces a decline of average performance of conspecifics within a population, but individual heterogeneity in the ability to cope with elevating temperatures has rarely been studied. In this study, we examined inter-individual variation in feeding ability and consequent growth rate of juvenile brown trout Salmo trutta acclimated to a high temperature (19°C), and investigated the relationship between these metrics of whole-animal performances and among-individual variation in mitochondrial respiration capacity. Food was provided ad libitum yet intake varied ten-fold amongst individuals, resulting in some fish losing weight whilst others continued to grow. Almost half of the variation in food intake was related to variability in mitochondrial capacity: low intake (and hence growth failure) was associated with high leak respiration rates within liver and muscle mitochondria, and a lower coupling of muscle mitochondria. These observations, combined with the inability of fish with low food consumption to increase their intake despite ad libitum food levels, suggest a possible insufficient capacity of the mitochondria for maintaining ATP homeostasis. Individual variation in thermal performance is likely to confer variation in the upper limit of an organism's thermal niche and in turn affect the structure of wild populations in warming environments.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Anderson, Mr Graeme and Auer, Dr Sonya and Metcalfe, Professor Neil and Selman, Professor Colin and Salin, Dr Karine
Authors: Salin, K., Auer, S. K., Anderson, G. J., Selman, C., 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 Experimental Biology
Publisher:Company of Biologists
ISSN:0022-0949
ISSN (Online):1477-9145
Copyright Holders:Copyright © 2016 The Company of Biologists Ltd
First Published:First published in Journal of Experimental Biology 219(9): 1356-1362
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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