Show simple item record

dc.contributor.authorDiserud, Ola Håvard
dc.contributor.authorFiske, Peder
dc.contributor.authorKarlsson, Sten
dc.contributor.authorGlover, Kevin Alan
dc.contributor.authorNæsje, Tor
dc.contributor.authorAronsen, Tonje
dc.contributor.authorBakke, Gunnar O
dc.contributor.authorBarlaup, Bjørn Torgeir
dc.contributor.authorErkinaro, J.
dc.contributor.authorFlorø-Larsen, Bjørn
dc.contributor.authorFoldvik, Anders
dc.contributor.authorHeino, Mikko Petteri
dc.contributor.authorKanstad-Hanssen, Øyvind
dc.contributor.authorLo, Håvard
dc.contributor.authorLund, Roar Asbjørn
dc.contributor.authorMuladal, R.
dc.contributor.authorNiemela, E.
dc.contributor.authorØkland, Finn
dc.contributor.authorØstborg, Gunnel Marie
dc.contributor.authorOtterå, Håkon Magne
dc.contributor.authorSkaala, Øystein
dc.contributor.authorSkoglund, Helge
dc.contributor.authorSolberg, Ingrid
dc.contributor.authorSolberg, Monica Favnebøe
dc.contributor.authorSollien, Vegard Pedersen
dc.contributor.authorSægrov, Harald
dc.contributor.authorUrdal, Kurt
dc.contributor.authorWennevik, Vidar
dc.contributor.authorHindar, Kjetil
dc.description.abstractMarine aquaculture of Atlantic salmon (Salmo salar) is a relatively new industry where breeding programs have led to rapid genetic change in the captive populations that were built up alongside conspecific wild individuals. Throughout its 50-years history, marine aquaculture of Atlantic salmon has been associated with escapes, and studies have shown that escapees may enter rivers, spawn successfully, and this may lead to farmed-to-wild genetic introgression and maladaptation in wild populations. Yet, an open question is what factors can best explain the variability in the proportion of farmed escapees in wild populations, and when present, which additional factors lead to introgression. Here, we combine two large-scale data sets from monitoring escaped farmed salmon and introgression in Norwegian rivers between 2006 and 2018 to model how anthropogenic, environmental, and population factors influence proportion of escapees and level of introgression.We found that increasing farming intensity and river discharge increase the expected proportions of escaped farmed salmon in rivers, whereas a larger wild salmon population size reduces the expected proportion of escapees despite increasing the expected absolute numbers of escaped farmed salmon. On a large scale, introgression is primarily a function of proportions of escaped farmed salmon, and only to a minor extent a function of local environmental factors or salmon population characteristics. This suggests that as long as salmon aquaculture is based on technologies where non-sterile fish can escape, all anadromous wild Atlantic salmon populations are at risk. Largemarine protected areaswithout salmon aquaculture may slow down the rate of intrusion and introgression by increasing the distance between intensive aquaculture and wild populations. admixture, aquaculture, Atlantic salmon, escaped farmed salmon, gene flow, Salmo salar.en_US
dc.rightsNavngivelse 4.0 Internasjonal*
dc.subjectAtlantic salmonen_US
dc.subjectescaped farmed salmonen_US
dc.subjectgene flowen_US
dc.subjectSalmo salaren_US
dc.titleNatural and anthropogenic drivers of escaped farmed salmon occurrence and introgression into wild Norwegian Atlantic salmon populationsen_US
dc.title.alternativeNatural and anthropogenic drivers of escaped farmed salmon occurrence and introgression into wild Norwegian Atlantic salmon populationsen_US
dc.typePeer revieweden_US
dc.typeJournal articleen_US
dc.rights.holder© 2021 The Authorsen_US
dc.subject.nsiVDP::Zoologiske og botaniske fag: 480en_US
dc.subject.nsiVDP::Zoology and botany: 480en_US
dc.source.journalICES Journal of Marine Scienceen_US
dc.relation.projectAndre: Miljødirektorateten_US
dc.relation.projectEgen institusjon: Norwegian institute for nature research (NINA)en_US
dc.relation.projectNorges forskningsråd: 254852en_US
dc.relation.projectAndre: Fiskeridirektorateten_US
dc.relation.projectNorges forskningsråd: 216105en_US

Files in this item


This item appears in the following Collection(s)

Show simple item record

Navngivelse 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Navngivelse 4.0 Internasjonal