Browsing Articles by Author "Skaala, Øystein"
Now showing items 21-39 of 39
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Introgression of domesticated salmon changes life history and phenology of a wild salmon population
Besnier, Francois; Ayllon, Fernando; Skaala, Øystein; Solberg, Monica Favnebøe; Fjeldheim, Per Tommy; Andersen, Kaja Christine; Knutar, Sofie; Glover, Kevin Alan (Peer reviewed; Journal article, 2022)The release of domesticated conspecifics into the natural environment, whether deliberate or accidental, has the potential to alter the genetic integrity and evolutionary trajectory of wild populations. This widespread ... -
Judging a salmon by its spots: Environmental variation is the primary determinant of spot patterns in Salmo salar
Jørgensen, Katarina Mariann; Solberg, Monica Favnebøe; Besnier, Francois; Thorsen, Anders; Fjelldal, Per Gunnar; Skaala, Øystein; Malde, Ketil; Glover, Kevin (Journal article; Peer reviewed, 2018)In fish, morphological colour changes occur from variations in pigment concentrations and in the morphology, density, and distribution of chromatophores in the skin. However, the underlying mechanisms remain unresolved in ... -
Large-effect loci mediate rapid adaptation of salmon body size after river regulation
Jensen, Arne Johan; Hagen, Ingerid Julie; Czorlich, Yann; Bolstad, Geir Hysing; Bremset, Gunnbjørn; Finstad, Bengt; Hindar, Kjetil; Skaala, Øystein; Karlsson, Sten (Peer reviewed; Journal article, 2022)Understanding the potential of natural populations to adapt to altered environments is becoming increasingly relevant in evolutionary research. Currently, our understanding of adaptation to human alteration of the environment ... -
Large-effect loci mediate rapid adaptation of salmon body size after river regulation
Jensen, Arne Johan; Hagen, Ingerid Julie; Czorlich, Yann; Bolstad, Geir Hysing; Bremset, Gunnbjørn; Finstad, Bengt; Hindar, Kjetil; Skaala, Øystein; Karlsson, Sten (Peer reviewed; Journal article, 2022)Understanding the potential of natural populations to adapt to altered environments is becoming increasingly relevant in evolutionary research. Currently, our understanding of adaptation to human alteration of the environment ... -
Long-term monitoring of a brown trout (Salmo trutta) population reveals kin-associated migration patterns and contributions by resident trout to the anadromous run
Duval, Eloïse; Skaala, Øystein; Sanchez, Maria Quintela; Dahle, Geir; Delaval, Aurelien Nicolas; Wennevik, Vidar; Glover, Kevin Alan; Hansen, Michael Möller (Peer reviewed; Journal article, 2021)In species showing partial migration, as is the case for many salmonid fishes, it is important to assess how anthropogenic pressure experienced by migrating individuals affects the total population. We focused on brown ... -
Major histocompatibility complex (MHC) variation and susceptibility to the sea louse Lepeophtheirus salmonis in Atlantic salmon Salmo salar
Glover, Kevin A.; Grimholt, Unni; Bakke, H.G.; Nilsen, Frank; Storset, Arne; Skaala, Øystein (Journal article; Peer reviewed, 2007-06-07)The relationship between genetic variation in major histocompatibility complex (MHC) Class I and II genes and susceptibility to sea lice Lepeophtheirus salmonis (Krøyer) in Atlantic salmon Salmo salar (L.) was studied ... -
Microsatellite DNA used for parentage identification of partly digested Atlantic salmon (Salmo salar) juveniles through non-destructive diet sampling in salmonids
Skaala, Øystein; Glover, Kevin A.; Barlaup, Bjørn T.; Borgstrøm, Reidar (Journal article; Peer reviewed, 2013-10-15)Predation during early life history is an important component of fitness in salmonids. Farmed Atlantic salmon display lower survival in the wild in comparison to wild salmon; however, the underlying mechanisms remain ... -
Migration of Atlantic salmon post-smolts in a fjord with high infestation pressure of salmon lice
Halttunen, Elina; Gjelland, Karl Øystein; Glover, Kevin; Johnsen, Ingrid Askeland; Serra-Llinares, Rosa-Maria; Skaala, Øystein; Nilsen, Rune; Bjørn, Pål Arne; Karlsen, Ørjan; Finstad, Bengt; Skilbrei, Ove Tommy (Peer reviewed; Journal article, 2018)Understanding Atlantic salmon Salmo salar post-smolt coastal migration behaviour is crucial for predicting their exposure to ecological challenges such as the parasite salmon louse Lepeophtheirus salmonis. We compared the ... -
Molecular Genetic Analysis of Stomach Contents Reveals Wild Atlantic Cod Feeding on Piscine Reovirus (PRV) Infected Atlantic Salmon Originating from a Commercial Fish Farm
Glover, Kevin A.; Sørvik, Anne Grete Eide; Karlsbakk, Egil; Zhang, Zhiwei; Skaala, Øystein (Journal article; Peer reviewed, 2013-04-19)In March 2012, fishermen operating in a fjord in Northern Norway reported catching Atlantic cod, a native fish forming an economically important marine fishery in this region, with unusual prey in their stomachs. It was ... -
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. ... -
Population genetic analysis reveals a geographically limited transition zone between two genetically distinct Atlantic salmon lineages in Norway
Wennevik, Vidar; Sanchez, Maria Quintela; Skaala, Øystein; Verspoor, Eric; Prusov, Sergey; Glover, Kevin (Journal article; Peer reviewed, 2019)Atlantic salmon is characterized by a high degree of population genetic structure throughout its native range. However, while populations inhabiting rivers in Norway and Russia make up a significant proportion of salmon ... -
Potential disease interaction reinforced: double-virusinfected escaped farmed Atlantic salmon, Salmo salar L., recaptured in a nearby river
Madhun, Abdullah Sami; Karlsbakk, Egil; Isachsen, Cecilie Helen; Omdal, Linn Maren; Sørvik, Anne Grete Eide; Skaala, Øystein; Barlaup, Bjørn; Glover, Kevin (Journal article; Peer reviewed, 2014-01-27)The role of escaped farmed salmon in spreading infectious agents from aquaculture to wild salmonid populations is largely unknown. This is a case study of potential disease interaction between escaped farmed and wild fish ... -
Predicting the nationwide outmigration timing of Atlantic salmon (Salmo salar) smolts along 12 degrees of latitude in Norway
Vollset, Knut; Lennox, Robert J.; Lamberg, Anders; Skaala, Øystein; Sandvik, Anne Dagrun; Sægrov, Harald; Kvingedal, Eli; Kristensen, Torstein; Jensen, Arne Johan; Haraldstad, Tormod; Barlaup, Bjørn Torgeir; Ugedal, Ola (Peer reviewed; Journal article, 2021) -
The ecological profile of Atlantic salmon escapees entering a river throughout an entire season: Diverse in escape history and genetic background, but frequently virus-infected
Madhun, Abdullah Sami; Wennevik, Vidar; Karlsbakk, Egil; Skaala, Øystein; Fiksdal, Ingrid Uglenes; Meier, Sonnich; Tang, Yongkai; Glover, Kevin (Peer reviewed; Journal article, 2017) -
The frequency of spontaneous triploidy in farmedAtlantic salmon produced in Norway during theperiod 2007–2014
Glover, Kevin; Madhun, Abdullah Sami; Dahle, Geir; Sørvik, Anne Grete Eide; Wennevik, Vidar; Skaala, Øystein; Morton, Hugh Craig; Hansen, Tom Johnny; Fjelldal, Per Gunnar (Journal article; Peer reviewed, 2015-04-11)Background: Spontaneous triploidy has been reported in a number of fish species, and is often linked with in vivo or in vitro ageing of eggs post ovulation. Here, we provide the first investigation into the frequency of ... -
Three Decades of Farmed Escapees in the Wild: A Spatio- Temporal Analysis of Atlantic Salmon Population Genetic Structure throughout Norway
Glover, Kevin A.; Quintela, Maria; Wennevik, Vidar; Besnier, Francois; Sørvik, Anne Grete Eide; Skaala, Øystein (Journal article; Peer reviewed, 2012-08-15)Each year, hundreds of thousands of domesticated farmed Atlantic salmon escape into the wild. In Norway, which is the world’s largest commercial producer, many native Atlantic salmon populations have experienced large ... -
Time series covering up to four decades reveals major changes and drivers of marine growth and proportion of repeat spawners in an Atlantic salmon population
Harvey, Alison C.; Skaala, Øystein; Borgstrøm, Reidar; Andersen-Fjeldheim, Per Tommy; Andersen-Fjeldheim, Kaja Christine; Utne, Kjell Rong; Johnsen, Ingrid Askeland; Fiske, Peder; Winterthun, Synnøve; Knutar, Sofie; Sægrov, Harald; Urdal, Kurt; Glover, Kevin Alan (Peer reviewed; Journal article, 2022)Wild Atlantic salmon populations have declined in many regions and are affected by diverse natural and anthropogenic factors. To facilitate management guidelines, precise knowledge of mechanisms driving population changes ... -
Timing is everything: Fishing-season placement may represent the most important angling-induced evolutionary pressure on Atlantic salmon populations
Harvey, Alison C.; Tang, Yongkai; Wennevik, Vidar; Skaala, Øystein; Glover, Kevin (Peer reviewed; Journal article, 2017) -
Timing is everything: Survival of Atlantic salmon Salmo salar postsmolts during events of high salmon lice densities
Bøhn, Thomas; Gjelland, Karl Øystein; Serra Llinares, Rosa Maria; Finstad, Bengt; Primicerio, Raul; Nilsen, Rune; Karlsen, Ørjan; Sandvik, Anne Dagrun; Skilbrei, Ove Tommy; Elvik, Kristine Marit Schrøder; Skaala, Øystein; Bjørn, Pål Arne (Peer reviewed; Journal article, 2020)Atlantic salmon in aquaculture act as reservoir hosts and vectors of parasites like salmon lice and this parasite is shown to harm wild salmonid populations. In this study, n = 29,817 tagged Atlantic salmon were studied ...