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dc.contributor.authorSanchez-Hernandez, Javier
dc.contributor.authorAmundsen, Per-Arne
dc.date.accessioned2018-06-11T08:07:58Z
dc.date.available2018-06-11T08:07:58Z
dc.date.issued2014-04-29
dc.description.abstractIn subarctic lake systems, fish species like brown trout are often important predators, and their niche performance is a key characteristic for understanding trophic interactions and food web functioning at upper trophic levels. Here, we studied summer habitat use and stomach contents of brown trout under both allopatric and sympatric conditions in six subarctic lakes to reveal its trophic role, and population- and individual-level niche plasticity. In allopatry, brown trout mainly used the littoral habitat, but less commonly also the pelagic zone. In sympatry with stickleback, there was always a considerable habitat overlap between the two species. In contrast, sympatric populations of brown trout and Arctic charr generally revealed a distinct habitat segregation. In the sympatric systems, there was in general a distinct resource partitioning between the trout and charr, whereas the observed diet overlap between trout and stickleback was much larger. Trout modified their individual dietary specialization between the littoral and pelagic zone, always being lower in the littoral. Piscivorous behaviour of trout was only found in sympatric systems, possibly contributing to a competitive advantage of trout over charr and stickleback. Hence, the trophic level of trout was strongly related to the fish community composition, with a higher trophic level in sympatric systems where piscivorous behaviour was frequent. These changes in the trophic level of trout linked with the observed food resource partitioning might be an important mechanism in the ecosystem functioning of subarctic lakes in order to allow coexistence among sympatric-living fish species.en_US
dc.descriptionAccepted manuscript version. Published version available in <a href= https://doi.org/10.1111/eff.12139> Trophic ecology of brown trout (Salmo trutta L.) in subarctic lakes (2015) 24(1), s.148-161. </a>.en_US
dc.identifier.citationSanchez-Hernandez, J. & Amundsen, P-A. (2015).Trophic ecology of brown trout (Salmo trutta L.) in subarctic lakes. Ecology of Freshwater Fish, 24(1), 148-161. https://doi.org/10.1111/eff.12139en_US
dc.identifier.cristinIDFRIDAID 1192448
dc.identifier.doi10.1111/eff.12139
dc.identifier.issn0906-6691
dc.identifier.issn1600-0633
dc.identifier.urihttps://hdl.handle.net/10037/12851
dc.language.isoengen_US
dc.publisherWileyen_US
dc.relation.journalEcology of Freshwater Fish
dc.relation.projectIDinfo:eu-repo/grantAgreement/RCN/FRIMEDBIO/213610/Norway/The role of parasites in food-web topology and dynamics of subarctic lakes//.en_US
dc.rights.accessRightsopenAccessen_US
dc.subjectVDP::Landbruks- og Fiskerifag: 900::Fiskerifag: 920en_US
dc.subjectVDP::Agriculture and fishery disciplines: 900::Fisheries science: 920en_US
dc.subjectCoexistenceen_US
dc.subjectPiscivoryen_US
dc.subjectResource partitioningen_US
dc.subjectSympatryen_US
dc.subjectAllopatryen_US
dc.titleTrophic ecology of brown trout (Salmo trutta L.) in subarctic lakesen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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