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Ecological influences and morphological correlates of resting and maximal metabolic rates across teleost fish species


Killen, SS and Glazier, DS and Rezende, EL and Clark, TD and Atkinson, D and Willener, AST and Halsey, LG, Ecological influences and morphological correlates of resting and maximal metabolic rates across teleost fish species, American Naturalist, 187, (5) pp. 592-606. ISSN 0003-0147 (2016) [Refereed Article]

Copyright Statement

Copyright 2016 by The University of Chicago. All rights reserved

DOI: doi:10.1086/685893


Rates of aerobic metabolism vary considerably across evolutionary lineages, but little is known about the proximate and ultimate factors that generate and maintain this variability. Using data for 131 teleost fish species, we performed a large-scale phylogenetic comparative analysis of how interspecific variation in resting metabolic rates (RMRs) and maximum metabolic rates (MMRs) is related to several ecological and morphological variables. Mass- and temperature-adjusted RMR and MMR are highly correlated along a continuum spanning a 30- to 40-fold range. Phylogenetic generalized least squares models suggest that RMR and MMR are higher in pelagic species and that species with higher trophic levels exhibit elevated MMR. This variation is mirrored at various levels of structural organization: gill surface area, muscle protein content, and caudal fin aspect ratio (a proxy for activity) are positively related with aerobic capacity. Muscle protein content and caudal fin aspect ratio are also positively correlated with RMR. Hypoxia-tolerant lineages fall at the lower end of the metabolic continuum. Different ecological lifestyles are associated with contrasting levels of aerobic capacity, possibly reflecting the interplay between selection for increased locomotor performance on one hand and tolerance to low resource availability, particularly oxygen, on the other. These results support the aerobic capacity model of the evolution of endothermy, suggesting elevated body temperatures evolved as correlated responses to selection for high activity levels.

Item Details

Item Type:Refereed Article
Keywords:aerobic scope, energetics, metabolic scaling, physiological ecology, teleost fish
Research Division:Biological Sciences
Research Group:Zoology
Research Field:Animal physiological ecology
Objective Division:Environmental Management
Objective Group:Terrestrial systems and management
Objective Field:Terrestrial biodiversity
UTAS Author:Clark, TD (Dr Timothy Clark)
ID Code:110442
Year Published:2016
Web of Science® Times Cited:114
Deposited By:Ecology and Biodiversity
Deposited On:2016-07-27
Last Modified:2018-04-13

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