Metabolic traits in brown trout (Salmo trutta) vary in response to food restriction and intrinsic factors

dc.contributor.authorArcher, Louise C.
dc.contributor.authorHutton, Stephen A.
dc.contributor.authorHarman, Luke
dc.contributor.authorPoole, W. Russell
dc.contributor.authorGargan, Patrick
dc.contributor.authorMcGinnity, Philip
dc.contributor.authorReed, Thomas E.
dc.contributor.funderHorizon 2020en
dc.contributor.funderEuropean Research Councilen
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderMarine Institute, Irelanden
dc.description.abstractMetabolic rates vary hugely within and between populations, yet we know relatively little about factors causing intraspecific variation. Since metabolic rate determines the energetic cost of life, uncovering these sources of variation is important to understand and forecast responses to environmental change. Moreover, few studies have examined factors causing intraspecific variation in metabolic flexibility. We explore how extrinsic environmental conditions and intrinsic factors contribute to variation in metabolic traits in brown trout, an iconic and polymorphic species that is threatened across much of its native range. We measured metabolic traits in offspring from two wild populations that naturally show life-history variation in migratory tactics (one anadromous, i.e. sea-migratory, one non-anadromous) that we reared under either optimal food or experimental conditions of long-term food restriction (lasting between 7 and 17 months). Both populations showed decreased standard metabolic rates (SMR—baseline energy requirements) under low food conditions. The anadromous population had higher maximum metabolic rate (MMR) than the non-anadromous population, and marginally higher SMR. The MMR difference was greater than SMR and consequently aerobic scope (AS) was higher in the anadromous population. MMR and AS were both higher in males than females. The anadromous population also had higher AS under low food compared to optimal food conditions, consistent with population-specific effects of food restriction on AS. Our results suggest different components of metabolic rate can vary in their response to environmental conditions, and according to intrinsic (population-background/sex) effects. Populations might further differ in their flexibility of metabolic traits, potentially due to intrinsic factors related to life history (e.g. migratory tactics). More comparisons of populations/individuals with divergent life histories will help to reveal this. Overall, our study suggests that incorporating an understanding of metabolic trait variation and flexibility and linking this to life history and demography will improve our ability to conserve populations experiencing global change.en
dc.description.sponsorshipScience Foundation Ireland (15/IA/3028 and 16/BBSRC/3316); Marine Institute, Ireland (grant-in-aid (RESPI/FS/16/01) from the Marine Institute (Ireland) as part of the Marine Research Programme by the Irish Government)en
dc.description.statusPeer revieweden
dc.description.versionPublished Versionen
dc.identifier.citationArcher, L. C., Hutton, S. A., Harman, L., Poole, W. R., Gargan, P., McGinnity, P. and Reed, T. E. (2020) 'Metabolic traits in brown trout (Salmo trutta) vary in response to food restriction and intrinsic factors', Conservation Physiology, 8 (1), coaa096, (17 pp). doi: 10.1093/conphys/coaa096en
dc.identifier.journaltitleConservation Physiologyen
dc.publisherOxford University Pressen
dc.relation.projectinfo:eu-repo/grantAgreement/EC/H2020::ERC::ERC-STG/639192/EU/Alternative life histories: linking genes to phenotypes to demography/ALHen
dc.rights© The Author(s) 2020. Published by Oxford University Press and the Society for Experimental Biology. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.en
dc.subjectClimate changeen
dc.subjectPartial migrationen
dc.subjectPhenotypic flexibilityen
dc.subjectJuvenile atlantic salmonen
dc.subjectLife-history traitsen
dc.subjectIntraspecific variationen
dc.subjectIndividual variationen
dc.subjectAerobic scopeen
dc.subjectThermal acclimationen
dc.subjectOncorhynchus nerkaen
dc.subjectSwimming capacityen
dc.titleMetabolic traits in brown trout (Salmo trutta) vary in response to food restriction and intrinsic factorsen
dc.typeArticle (peer-reviewed)en
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