Blar i Scientific publications på forfatter "Karlsson, Sten"

Viser treff 1-20 av 22

    • Considering sampling bias in close-kin mark–recapture abundance estimates of Atlantic salmon 

      Wacker, Sebastian; Skaug, Hans Julius; Forseth, Torbjørn; Solem, Øyvind; Ulvan, Eva Marita; Fiske, Peder; Karlsson, Sten (Peer reviewed; Journal article, 2021)
      Genetic methods for the estimation of population size can be powerful alternatives to conventional methods. Close-kin mark–recapture (CKMR) is based on the principles of conventional mark–recapture, but instead of being ...

    • Downstream transport and seasonal variation in freshwater pearl mussel (Margaritifera margaritifera) eDNA concentration 

      Wacker, Sebastian; Fossøy, Frode; Larsen, Bjørn Mejdell; Brandsegg, Hege; Sivertsgård, Rolf; Karlsson, Sten (Peer reviewed; Journal article, 2019)
      Environmental DNA (eDNA) can be used to detect the presence and abundance of aquatic organisms from water samples. Before implementing this methodology as a tool for monitoring, more knowledge is needed on variation in ...

    • Escaped farmed Atlantic salmon grow, migrate and disperse throughout the Arctic Ocean like wild salmon 

      Jensen, Arne Johan; Karlsson, Sten; Fiske, Peder; Hansen, Lars Petter; Hindar, Kjetil; Østborg, Gunnel Marie (Peer reviewed; Journal article, 2013)
      This paper describes the first observations of escaped farmed Atlantic salmon Salmo salar in the Arctic Ocean. Among 138 individuals of Atlantic salmon captured at the west coast of the Spitsbergen Island at Svalbard in ...

    • Evaluating the Ryman–Laikre effect for marine stock enhancement and aquaculture 

      Waples, Robin S.; Hard, Jeffrey J.; Hindar, Kjetil; Karlsson, Sten (Journal article; Peer reviewed, 2016)
      The Ryman–Laikre (R-L) effect is an increase in inbreeding and a reduction in total effective population size (NeT) in a combined captive–wild system, which arises when a few captive parents produce large numbers of ...

    • Evaluation of genetic effects on wild salmon populations from stock enhancement 

      Hagen, Ingerid Julie; Ugedal, Ola; Jensen, Arne Johan; Lo, Håvard; Holthe, Espen; Bjøru, Bjørn; Florø-Larsen, Bjørn; Sægrov, Harald; Skoglund, Helge; Karlsson, Sten (Peer reviewed; Journal article, 2020)
      Many salmonid populations are of conservation concern, and the release of hatchery-produced juveniles is a frequently used measure to alleviate declines and increase harvest opportunities. While such releases may be of ...

    • Gene flow from domesticated escapes alters thelife history of wild Atlantic salmon 

      Bolstad, Geir Hysing; Hindar, Kjetil; Robertsen, Grethe; Jonsson, Bror; Sægrov, Harald; Diserud, Ola Håvard; Fiske, Peder; Jensen, Arne Johan; Urdal, Kurt; Næsje, Tor; Barlaup, Bjørn Torgeir; Florø-Larsen, Bjørn; Lo, Håvard; Niemela, Eero; Karlsson, Sten (Journal article, 2017)
      Interbreeding between domesticated and wild animals occurs in several species. This gene flow has long been anticipated to induce genetic changes in life-history traits of wild populations, thereby influencing population ...

    • Generic genetic differences between farmed and wild Atlantic Salmon identified from a 7K SNP-chip 

      Karlsson, Sten; Moen, Thomas; Lien, Sigbjørn; Glover, Kevin A.; Hindar, Kjetil (Peer reviewed; Journal article, 2011)
      Genetic interactions between farmed and wild conspecifics are of special concern in fisheries where large numbers of domesticated individuals are released into the wild. In the Atlantic salmon (Salmo salar), selective ...

    • Genetic evidence of farmed straying and introgression in Swedish wild salmon populations 

      Palm, Stefan; Karlsson, Sten; Diserud, Ola Håvard (Peer reviewed; Journal article, 2021)
      Escaped farmed Atlantic salmon represent a well-documented and ongoing threat to wild conspecific populations. In Norway, the world-leading producer of farmed salmon, annual monitoring of straying and genetic introgression ...

    • High levels of multiple paternity in a spermcast mating 

      Wacker, Sebastian; Larsen, Bjørn Mejdell; Jakobsen, Per; Karlsson, Sten (Journal article, 2018)
      Multiple paternity is an important characteristic of the genetic mating system and common across a wide range of taxa. Multiple paternity can increase within-population genotypic diversity, allowing selection to act on ...

    • Host specificity drives genetic structure in a freshwater mussel 

      Wacker, Sebastian; Larsen, Bjørn Mejdell; Karlsson, Sten; Hindar, Kjetil (Journal article, 2019)
      Parasites often depend on their hosts for long distance transport, and genetic population structure can be strongly affected by host specificity and dispersal. Freshwater pearl mussel (Margaritifera margaritifera) populations ...

    • Introgression from farmed escapees affects the full life cycle of wild Atlantic salmon 

      Bolstad, Geir Hysing; Karlsson, Sten; Hagen, Ingerid Julie; Fiske, Peder; Urdal, Kurt; Sægrov, Harald; Florø-Larsen, Bjørn; Sollien, Vegard Pedersen; Østborg, Gunnel Marie; Diserud, Ola Håvard; Jensen, Arne Johan; Hindar, Kjetil (Peer reviewed; Journal article, 2021)
      After a half a century of salmon farming, we have yet to understand how the influx of genes from farmed escapees affects the full life history of Atlantic salmon (Salmo salar L.) in the wild. Using scale samples of over ...

    • Iteroparity and its contribution to life-history variation in Atlantic salmon 

      Persson, Lo; Raunsgard, Astrid; Thorstad, Eva Bonsak; Østborg, Gunnel Marie; Urdal, Kurt; Sægrov, Harald; Ugedal, Ola; Hindar, Kjetil; Karlsson, Sten; Fiske, Peder; Bolstad, Geir Hysing (Peer reviewed; Journal article, 2023)
      Evolution of iteroparity is shaped by the trade-off between current and future reproduction.We studied variation in iteroparity among 205 050 individual Atlantic salmon caught in 179 rivers spanning 14◦ of latitude. The ...

    • Monitoring genetic diversity with new indicators applied to an alpine freshwater top predator 

      Andersson, Anastasia; Karlsson, Sten; Ryman, Nils; Laikre, Linda (Peer reviewed; Journal article, 2022)
      Genetic diversity is the basis for population adaptation and long-term survival, yet rarely considered in biodiversity monitoring. One key issue is the need for useful and straightforward indicators of genetic ...

    • Multiple paternity promotes genetic diversity in captive breeding of a freshwater mussel 

      Wacker, Sebastian; Larsen, Bjørn Mejdell; Jakobsen, Per Johan; Karlsson, Sten (Journal article; Peer reviewed, 2019)
      Captive breeding can be an important supplement to habitat restoration in the Conservation of threatened species. Careful choice of breeding regimes and genetic monitoring are essential to maintain genetic integrity and ...

    • Natural and anthropogenic drivers of escaped farmed salmon occurrence and introgression into wild Norwegian Atlantic salmon populations 

      Diserud, Ola Håvard; Fiske, Peder; Karlsson, Sten; Glover, Kevin Alan; Næsje, Tor; Aronsen, Tonje; Bakke, Gunnar O; Barlaup, Bjørn Torgeir; Erkinaro, J.; Florø-Larsen, Bjørn; Foldvik, Anders; Heino, Mikko Petteri; Kanstad-Hanssen, Øyvind; Lo, Håvard; Lund, Roar Asbjørn; Muladal, R.; Niemela, E.; Økland, Finn; Østborg, Gunnel Marie; Otterå, Håkon Magne; Skaala, Øystein; Skoglund, Helge; Solberg, Ingrid; Solberg, Monica Favnebøe; Sollien, Vegard Pedersen; Sægrov, Harald; Urdal, Kurt; Wennevik, Vidar; Hindar, Kjetil (Peer reviewed; Journal article, 2022)
      Marine 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. ...

    • The quest for successful Atlantic salmon restoration: perspectives, priorities, and maxims 

      Lennox, Robert; Alexandre, Carlos M; Almeida, Pedro R; Bailey, Kevin M.; Barlaup, Bjørn Torgeir; Bøe, Kristin; breukelaar, Andre; Erkinaro, Jaakko; Forseth, Torbjørn; Gabrielsen, Sven-Erik; Halfyard, Edmund; Hanssen, Erlend Mjelde; Karlsson, Sten; Koch, Stephanie; Koed, Anders; Langåker, Roy, M; Lo, Håvard; Lucas, Martyn C.; Mahlum, Shad Kenneth; Perrier, Charles; Pulg, Ulrich; Sheehan, Timothy F.; Skoglund, Helge; Svenning, Martin; Thorstad, Eva Bonsak; Velle, Gaute; Whoriskey, Frederick G.; Vollset, Knut (Peer reviewed; Journal article, 2021)
      Atlantic salmon is often a focal species of restoration efforts throughout the north Atlantic and it is therefore an excellent case study for how best to design programmes to address and mitigate threats and correct ...

    • Rapid evolution of genetic and phenotypic divergence in Atlantic salmon following the colonisation of two new branches of a watercourse 

      Jensen, Arne Johan; Hansen, Lars Petter; Johnsen, Bjørn Ove; Karlsson, Sten (Journal article; Peer reviewed, 2017)
      Background: Selection acts strongly on individuals that colonise a habitat and have phenotypic traits that deviate from the local optima. Our objective was to investigate the evolutionary rates in Atlantic salmon (Salmo ...

    • Selection against individuals from genetic introgression of escaped farmed salmon in a natural population of Atlantic salmon 

      Wacker, Sebastian; Aronsen, Tonje; Karlsson, Sten; Ugedal, Ola; Diserud, Ola Håvard; Ulvan, Eva Marita; Hindar, Kjetil; Næsje, Tor (Peer reviewed; Journal article, 2021)
      The viability of wild Atlantic salmon populations is threatened by genetic introgression from escaped farmed salmon. Farmed Atlantic salmon are genetically improved for important commercial traits and a life in captivity ...

    • Supplementary stocking selects for domesticated genotypes 

      Hagen, Ingerid Julie; Jensen, Arne Johan; Bolstad, Geir Hysing; Diserud, Ola Håvard; Hindar, Kjetil; Lo, Håvard; Karlsson, Sten (Journal article; Peer reviewed, 2019)
      Stocking of hatchery produced fish is common practise to mitigate declines in natural populations and may have unwanted genetic consequences. Here we describe a novel phenomenon arising where broodstock used for stocking ...

    • Using scale-derived estimates of body size in analyses of Atlantic salmon life-history variation: a cautionary note 

      Burton, Tim; Ugedal, Ola; Karlsson, Sten; Thorstad, Eva Bonsak; Bolstad, Geir Hysing (Peer reviewed; Journal article, 2024)
      Measurements of individual body length at different life stages are critical in understanding fish ecology and evolution. Such data can be obtained via back-calculation from measurements of fish scales or by using the size ...