The interplay between extrinsic and intrinsic factors in determining migration decisions in brown trout (Salmo trutta): An experimental study

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dc.contributor.author Archer, Louise C.
dc.contributor.author Hutton, Stephen A.
dc.contributor.author Harman, Luke
dc.contributor.author O'Grady, Michael N.
dc.contributor.author Kerry, Joseph P.
dc.contributor.author Poole, W. Russell
dc.contributor.author Gargan, Patrick
dc.contributor.author McGinnity, Philip
dc.contributor.author Reed, Thomas E.
dc.date.accessioned 2019-11-20T05:41:53Z
dc.date.available 2019-11-20T05:41:53Z
dc.date.issued 2019-06-14
dc.identifier.citation Archer, L.C., Hutton, S., Harman, L., O'Grady, M.N., Kerry, J.P., Poole, R., Gargan, P., McGinnity, P. and Reed, T.E. (2019) 'The interplay between extrinsic and intrinsic factors in determining migration decisions in brown trout (Salmo trutta): an experimental study'. Frontiers in Ecology and Evolution, 7, 222. (18pp). doi:10.3389/fevo.2019.00222 en
dc.identifier.volume 7 en
dc.identifier.startpage 1 en
dc.identifier.endpage 18 en
dc.identifier.uri http://hdl.handle.net/10468/9132
dc.identifier.doi 10.3389/fevo.2019.00222 en
dc.description.abstract Many species are capable of facultative migration, but the relative roles of extrinsic versus intrinsic factors in generating diverse migratory tactics remain unclear. Here we explore the proximate drivers of facultative migration in brown trout in an experimental laboratory setting. The effects of reduced food, as a putative environmental cue, were examined in two populations: one that exhibits high rates of anadromy (sea-migration) in nature, and one that does not exhibit anadromy in nature. Juveniles derived from wild-caught parents were reared for two years under four environmental treatments: low food in years 1 and 2 (Low-Low); high food in years 1 and 2 (High-High), low food in year 1 and high in year 2 (Low-High), and vice versa (High-Low). Food restriction had a significant effect on migratory tactics, with the frequency of smolts (juveniles choosing migration) highest in the Low-Low treatment in both populations. No individuals became smolts in the High-High treatment, and intermediate smolting rates were observed in the Low-High and High-Low treatments. Higher overall smolting rates in the naturally anadromous population suggested an inherited component to anadromy/migration decisions, but both populations showed variability in migratory tactics. Importantly, some fish from the naturally non-anadromous population became smolts in the experiment, implying the capacity for migration was lying ‘dormant’, but they exhibited lower hypo-osmoregulatory function than smolts from the naturally anadromous population. Tactic frequencies in the naturally anadromous population were more affected by food in the 2nd year, while food in the 1st year appeared more important for the naturally non-anadromous population. Migratory tactics were also related to sex, but underpinned in both sexes by growth in key periods, size and energetic state. Collectively these results reveal how migration decisions are shaped by a complex interplay between extrinsic and intrinsic factors, informing our ability to predict how facultatively migratory populations will respond to environmental change. en
dc.description.sponsorship Science Foundation Ireland (15/IA/3028 and 16/BBSRC/3316); Marine Institute (ESPI/FS/16/01) en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher Frontiers Media en
dc.relation.uri https://www.frontiersin.org/articles/10.3389/fevo.2019.00222
dc.rights © 2019 Archer, Hutton, Harman, O'Grady, Kerry, Poole, Gargan, McGinnity and Reed. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. en
dc.rights.uri https://creativecommons.org/licenses/by/4.0/ en
dc.subject Partial migration en
dc.subject Climate Change en
dc.subject Anadromy en
dc.subject Aquatic en
dc.subject Brown trout en
dc.subject Salmo trutta en
dc.subject Genotype by environment en
dc.subject Proximate drivers en
dc.title The interplay between extrinsic and intrinsic factors in determining migration decisions in brown trout (Salmo trutta): An experimental study en
dc.type Article (peer-reviewed) en
dc.internal.authorcontactother Louise Archer, School of Biological, Earth and Environmental Sciences, University College Cork, Cork, Ireland. +353-21-490-3000 en
dc.internal.availability Full text available en
dc.description.version Published Version en
dc.contributor.funder Science Foundation Ireland en
dc.contributor.funder Marine Institute en
dc.contributor.funder European Research Council en
dc.description.status Peer reviewed en
dc.identifier.journaltitle Frontiers in Ecology and Evolution en
dc.identifier.articleid 222 en
dc.relation.project info:eu-repo/grantAgreement/EC/H2020::ERC::ERC-STG/639192/EU/Alternative life histories: linking genes to phenotypes to demography/ALH en
dc.relation.project info: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.identifier.eissn 2296-701X


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© 2019 Archer, Hutton, Harman, O'Grady, Kerry, Poole, Gargan, McGinnity and Reed. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms. Except where otherwise noted, this item's license is described as © 2019 Archer, Hutton, Harman, O'Grady, Kerry, Poole, Gargan, McGinnity and Reed. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
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