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dc.contributor.authorEloranta, Antti
dc.contributor.authorJohnsen, Stein Ivar
dc.contributor.authorPower, Michael
dc.contributor.authorBærum, Kim Magnus
dc.contributor.authorSandlund, Odd Terje
dc.contributor.authorFinstad, Anders Gravbrøt
dc.contributor.authorRognerud, Sigurd
dc.contributor.authorMuseth, Jon
dc.date.accessioned2018-09-03T13:44:05Z
dc.date.available2018-09-03T13:44:05Z
dc.date.created2018-08-07T08:28:52Z
dc.date.issued2018
dc.identifier.issn1387-3547
dc.identifier.urihttp://hdl.handle.net/11250/2560553
dc.description.abstractInvasive and introduced fishes can affect recipient ecosystems and native species via altered competitive and predatory interactions, potentially leading to top-down and bottom-up cascading impacts. Here, we describe a case from a large lake in southern Norway, Storsjøen, where the illegal introduction of a small, predominantly planktivorous fish species, European smelt (Osmerus eperlanus), has led to changes in the native fish community and lake food web. Survey fishing data collected before (2007) and after (2016) the introduction indicates that smelt has become the numerically dominant fish species both in benthic and pelagic habitats, with concurrent reductions in the relative abundance of native European whitefish (Coregonus lavaretus) and Arctic charr (Salvelinus alpinus) populations. Stable isotope (δ13C and δ15N) data indicate minor changes in the trophic niches of native whitefish and Arctic charr despite partly overlapping niches with the introduced smelt. In contrast, brown trout (Salmo trutta) showed an earlier shift to piscivory, a more pelagic niche and increased growth rate, likely because of the smelt induced increase in pelagic prey fish abundance. The main trophic pathway supporting top predators (i.e., large brown trout) in Storsjøen has, therefore, shifted from a littoral to a more pelagic base. Our study demonstrates that small-sized introduced fishes can alter lake food-web dynamics, with contrasting impacts on native fishes. This knowledge is vital for future evaluation and mitigation of potential impacts of smelt introductions on lake ecosystems.nb_NO
dc.language.isoengnb_NO
dc.publisherSpringer Verlagnb_NO
dc.titleIntroduced European smelt (Osmerus eperlanus) affects food web and fish community in a large Norwegian lakenb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.description.versionacceptedVersionnb_NO
dc.source.journalBiological Invasionsnb_NO
dc.identifier.doihttps://doi.org/10.1007/s10530-018-1806-0
dc.identifier.cristin1600075
dc.relation.projectNorges forskningsråd: 243910nb_NO
dc.description.localcodeThis is a post-peer-review, pre-copyedit version of an article published in [Biological Invasions] Locked until 6.8.2019 due to copyright restrictions. The final authenticated version is available online at: https://doi.org/10.1007/s10530-018-1806-0nb_NO
cristin.unitcode194,31,10,0
cristin.unitnameInstitutt for naturhistorie
cristin.ispublishedtrue
cristin.fulltextpostprint
cristin.qualitycode1


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