Food and temperature stressors have opposing effects in determining flexible migration decisions in brown trout (Salmo trutta)

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dc.contributor.authorArcher, Louise C.
dc.contributor.authorHutton, Stephen A.
dc.contributor.authorHarman, Luke
dc.contributor.authorMcCormick, Stephen D.
dc.contributor.authorO'Grady, Michael N.
dc.contributor.authorKerry, Joseph P.
dc.contributor.authorPoole, W. Russell
dc.contributor.authorGargan, Patrick
dc.contributor.authorMcGinnity, Philip
dc.contributor.authorReed, Thomas E.
dc.contributor.funderScience Foundation Irelanden
dc.contributor.funderMarine Instituteen
dc.contributor.funderEuropean Research Councilen
dc.contributor.funderHorizon 2020en
dc.date.accessioned2020-04-02T09:44:00Z
dc.date.available2020-04-02T09:44:00Z
dc.date.issued2020-02-27
dc.date.updated2020-04-02T09:23:02Z
dc.description.abstractWith rapid global change, organisms in natural systems are exposed to a multitude of stressors that likely co‐occur, with uncertain impacts. We explored individual and cumulative effects of co‐occurring environmental stressors on the striking, yet poorly understood, phenomenon of facultative migration. We reared offspring of a brown trout population that naturally demonstrates facultative anadromy (sea migration), under different environmental stressor treatments and measured life history responses in terms of migratory tactics and freshwater maturation rates. Juvenile fish were exposed to reduced food availability, temperatures elevated to 1.8°C above natural conditions or both treatments in combination over 18 months of experimental tank rearing. When considered in isolation, reduced food had negative effects on the size, mass and condition of fish across the experiment. We detected variable effects of warm temperatures (negative effects on size and mass, but positive effect on lipids). When combined with food restriction, temperature effects on these traits were less pronounced, implying antagonistic stressor effects on morphological traits. Stressors combined additively, but had opposing effects on life history tactics: migration increased and maturation rates decreased under low food conditions, whereas the opposite occurred in the warm temperature treatment. Not all fish had expressed maturation or migration tactics by the end of the study, and the frequency of these ‘unassigned’ fish was higher in food deprivation treatments, but lower in warm treatments. Fish showing migration tactics were smaller and in poorer condition than fish showing maturation tactics, but were similar in size to unassigned fish. We further detected effects of food restriction on hypo‐osmoregulatory function of migrants that may influence the fitness benefits of the migratory tactic at sea. We also highlight that responses to multiple stressors may vary depending on the response considered. Collectively, our results indicate contrasting effects of environmental stressors on life history trajectories in a facultatively migratory species.en
dc.description.sponsorshipScience Foundation Ireland (Grant Number: 16/BBSRC/3316); Marine Institute (Grant Number: RESPI/FS/16/01); European Research Council (Grant Number: 639192‐ALH)en
dc.description.statusPeer revieweden
dc.description.versionAccepted Versionen
dc.format.mimetypeapplication/pdfen
dc.identifier.citationArcher, L. C., Hutton, S. A., Harman, L., McCormick, S. D., O’Grady, M. N., Kerry, J. P., Poole, W. R., Gargan, P., McGinnity, P. and Reed, T. E. (2020) 'Food and temperature stressors have opposing effects in determining flexible migration decisions in brown trout (Salmo trutta)', Global Change Biology, 26(5), pp. 2878-2896. doi: 10.1111/gcb.14990en
dc.identifier.doi10.1111/gcb.14990en
dc.identifier.eissn1365-2486
dc.identifier.endpage2896
dc.identifier.issn1354-1013
dc.identifier.journaltitleGlobal Change Biologyen
dc.identifier.startpage2878
dc.identifier.urihttps://hdl.handle.net/10468/9808
dc.identifier.volume26
dc.language.isoenen
dc.publisherJohn Wiley & Sons, Inc.en
dc.relation.projectinfo:eu-repo/grantAgreement/SFI/SFI Investigator Programme/15/IA/3028/IE/Wild farmed interactions in a changing world: formulation of a predictive methodology to inform environmental best practice to secure long-term sustainability of global wild and farm fish populations/en
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© 2020, John Wiley & Sons, Inc. This is the peer reviewed version of the following article: Archer, L. C., Hutton, S. A., Harman, L., McCormick, S. D., O'Grady, M. N., Kerry, J. P., Poole, W. R., Gargan, P., McGinnity, P. and Reed, T. E. (2020) 'Food and temperature stressors have opposing effects in determining flexible migration decisions in brown trout (Salmo trutta)', Global Change Biology, doi: 10.1111/gcb.14990, which has been published in final form at https://doi.org/10.1111/gcb.14990. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.en
dc.subjectAnadromyen
dc.subjectAntagonistic interactionen
dc.subjectAquaticen
dc.subjectBrown trouten
dc.subjectClimate changeen
dc.subjectMultiple stressorsen
dc.subjectPartial migrationen
dc.subjectSalmo truttaen
dc.titleFood and temperature stressors have opposing effects in determining flexible migration decisions in brown trout (Salmo trutta)en
dc.typeArticle (peer-reviewed)en
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