Inter-individual variation in mitochondrial phosphorylation efficiency predicts growth rates in ectotherms at high temperatures

Dawson, N. J. , Millet, C., Selman, C. and Metcalfe, N. B. (2022) Inter-individual variation in mitochondrial phosphorylation efficiency predicts growth rates in ectotherms at high temperatures. FASEB Journal, 36(6), e22333. (doi: 10.1096/fj.202101806RR) (PMID:35486025)

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There is increasing evidence that aquatic ectotherms are especially vulnerable to global warming since their metabolic demands increase with ambient temperature while water-oxygen content decreases. The possible role of shrinking aerobic scope in limiting performance has been much discussed; however, less attention has been given to whether tissue-level changes in the efficiency of oxygen usage occur at elevated temperatures. Here, we show that this varies widely among individuals, with consequences for performance. We examined the inter-individual variation in growth rate and mitochondrial function from white muscle and liver of brown trout (Salmo trutta) acclimated to either high (19.5°C) or near-optimal temperature (12°C). Liver (but not muscle) mitochondria showed a positive relationship between growth rate and maximal oxidative phosphorylation at both temperatures, and a negative relationship between growth rate and ROS release. There was a positive correlation in both tissues between individual mitochondrial phosphorylation efficiency and growth rate, but only at 19.5°C. In this representative of aquatic ectotherms, an individual's liver mitochondrial efficiency thus seems to dictate its capacity to grow at elevated temperatures. This suggests that individual heterogeneity in cellular function may cause variation in the thermal limits of aquatic ectotherms and could adversely affect wild populations in warming environments.

Item Type:Articles
Glasgow Author(s) Enlighten ID:Metcalfe, Professor Neil and Selman, Professor Colin and Millet, Dr Caroline and Dawson, Dr Neal
Authors: Dawson, N. J., Millet, C., Selman, C., and Metcalfe, N. B.
College/School:College of Medical Veterinary and Life Sciences > School of Biodiversity, One Health & Veterinary Medicine
Journal Name:FASEB Journal
Publisher:Federation of American Society of Experimental Biology
ISSN (Online):1530-6860
Published Online:29 April 2022
Copyright Holders:Copyright © 2022 The Authors
First Published:First published in FASEB Journal 36(6): e22333
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
301347Why do fish fail at high temperatures?Neil MetcalfeNatural Environment Research Council (NERC)NE/R001510/1Institute of Biodiversity, Animal Health and Comparative Medicine
305090MITOWILDNeil MetcalfeEuropean Commission (EC)834653Institute of Biodiversity, Animal Health and Comparative Medicine