Browsing Articles by Author "Knutsen, Halvor"
Now showing items 21-40 of 72
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Development of twelve microsatellite loci in the corkwing wrasse (Symphodus melops)
Knutsen, Halvor; Sannæs, Hanne (Journal article; Peer reviewed, 2010)We developed 12 microsatellite loci primers in 8 the corkwing wrasse (Symphodus melops). All markers 9 were obtained from partial genomic DNA libraries enri-10 ched for tetranucleotide repeats and characterized in 32 11 ... -
Development of twelve novel microsatellite loci in the European lobster (Homarus gammarus)
André, Carl; Knutsen, Halvor (Journal article; Peer reviewed, 2010-09)We developed twelve novel microsatellite loci 8 primers in the European lobster (Homarus gammarus). All 9 markers were obtained from partial genomic DNA libraries 10 enriched for tetranucleotide repeats and characterized ... -
Diel vertical migration patterns in juvenile cod from the Skagerrak coast
Espeland, Sigurd Heiberg; Thoresen, Adine Guldborg; Olsen, Esben Moland; Stige, Leif Christian; Knutsen, Halvor; Gjøsæter, Jakob; Stenseth, Nils Christian (Journal article; Peer reviewed, 2010-04-29)We demonstrated a clear year-round diel vertical migration pattern (DVM) of small (26 to 45 cm) Skagerrak coastal cod Gadus morhua on a small geographic scale. Generalized additive models (GAMs) were used to make inferences ... -
Disentangling structural genomic and behavioral barriers in a sea of connectivity
Barth, Julia Maria Isis; Villegas-Ríos, David; Freitas, Carla; Moland, Even; Star, Bastiaan; André, Carl; Knutsen, Halvor; Bradbury, Ian; Dierking, Jan; Petereit, Christoph; Righton, David; Metcalfe, Julian; Jakobsen, Kjetill Sigurd; Olsen, Esben Moland; Jentoft, Sissel (Journal article; Peer reviewed, 2019)Genetic divergence among populations arises through natural selection or drift and is counteracted by connectivity and gene flow. In sympatric populations, isolating mechanisms are thus needed to limit the homogenizing ... -
Disparate movement behavior and feeding ecology in sympatric ecotypes of Atlantic cod
Kristensen, Martin Lykke; Olsen, Esben Moland; Moland, Even; Knutsen, Halvor; Grønkjær, Peter; Koed, Anders; Källo, Kristi; Aarestrup, Kim (Peer reviewed; Journal article, 2021)Coexistence of ecotypes, genetically divergent population units, is a widespread phenomenon, potentially affecting ecosystem functioning and local food web stability. In coastal Skagerrak, Atlantic cod (Gadus morhua) occur ... -
Effects of large-scale releases on the genetic integrity of red sea bream (Pagrus major, Temminck et Schlegel)
Blanco Gonzalez, Enrique; Aritaki, Masato; Knutsen, Halvor; Taniguchi, Nobuhiko (Journal article; Peer reviewed, 2015-05-20)Large-scale hatchery releases are carried out for many marine fish species worldwide; nevertheless, the long-term effects of this practice on the genetic structure of natural populations remains unclear. The lack of knowledge ... -
Egg distribution, bottom topography and small-scale cod population structure in a coastal marine system
Knutsen, Halvor; Olsen, Esben Moland; Ciannelli, Lorenzo; Espeland, Sigurd Heiberg; Knutsen, Jan Atle; Simonsen, Jan Henrik; Skreslet, Stig; Stenseth, Nils Christian (Journal article; Peer reviewed, 2007-03-12)Coastal marine species with pelagic egg and larval stages, such as the Atlantic cod Gadus morhua, can be structured into genetically distinct local populations on a surprisingly small geographic scale considering their ... -
Evidence of hybridization between genetically distinct Baltic cod stocks during peak population abundance(s)
Helmerson, Cecilia; Weist, Peggy; Brieuc, Marine Servane Ono; Maurstad, Marius Filomeno; Schade, Franziska Maria; Dierking, Jan; Petereit, Christoph; Knutsen, Halvor; Metcalfe, Julian; Righton, David; André, Carl; Krumme, Uwe; Jentoft, Sissel; Hanel, Reinhold (Peer reviewed; Journal article, 2023)Range expansions can lead to increased contact of divergent populations, thus increasing the potential of hybridization events. Whether viable hybrids are produced will most likely depend on the level of genomic divergence ... -
Evidence of hybridization between genetically distinct Baltic cod stocks during peak population abundance(s)
Helmerson, Cecilia; Weist, Peggy; Brieuc, Marine Servane Ono; Maurstad, Marius Filomeno; Schade, Franziska Maria; Dierking, Jan; Petereit, Christoph; Knutsen, Halvor; Metcalfe, Julian; Righton, David; André, Carl; Krumme, Uwe; Jentoft, Sissel; Hanel, Reinhold (Peer reviewed; Journal article, 2023)Range expansions can lead to increased contact of divergent populations, thus increasing the potential of hybridization events. Whether viable hybrids are produced will most likely depend on the level of genomic divergence ... -
Fine-Scale Population Differences in Atlantic Cod Reproductive Success: A Potential Mechanism for Ecological Speciation in a Marine Fish
Roney, Nancy; Oomen, Rebekah Alice; Knutsen, Halvor; Olsen, Esben Moland; Hutchings, Jeffrey (Journal article; Peer reviewed, 2018)Successful resource‐management and conservation outcomes ideally depend on matching the spatial scales of population demography, local adaptation, and threat mitigation. For marine fish with high dispersal capabilities, ... -
Fine-scale population dynamics in a marine fish species inferred from dynamic state-space models
Rogers, Lauren; Storvik, Geir Olve; Knutsen, Halvor; Olsen, Esben Moland; Stenseth, Nils Christian (Peer reviewed; Journal article, 2017) -
Genetic analysis of goldsinny wrasse reveals evolutionary insights into population connectivity and potentialevidence of inadverent translocationvia aquaculture.
Jansson, Eeva; Sanchez, Maria Quintela; Dahle, Geir; Albretsen, Jon; Knutsen, Halvor; André, Carl; Strand, Åsa; Mortensen, Stein; Taggart, John B.; Karlsbakk, Egil; Kvamme, Bjørn Olav; Glover, Kevin (Peer reviewed; Journal article, 2017) -
Genetic diversity within and among Atlantic cod (Gadus morhua) farmed in marine cages: a proof-of-concept study for the identification of escapees
Glover, Kevin A.; Dahle, Geir; Westgaard, Jon-Ivar; Johansen, Torild; Knutsen, Halvor; Jørstad, Knut Eirik (Journal article; Peer reviewed, 2010-03-23)This study presents a molecular genetic characterization of Atlantic cod reared in commercial marine farms. Samples consisted of approximately 47 fish collected from nine cages located on four farms throughout Norway. In ... -
Genetic study reveals local differentiation persisting in the face of high connectivity and a genomic inversion likely linked with sexual antagonism in a common marine fish
Jansson, Eeva; André, Carl; Quintela, Maria; Halvorsen, Kim Aleksander Tallaksen; Besnier, Francois; Ayllon, Fernando; Faust, Ellika; Knutsen, Halvor; Strand, Åsa; Glover, Kevin Alan (Peer reviewed; Journal article, 2023)Sustainable harvest of wild populations requires knowledge of the underlying population structure. The focus of this study is on goldsinny wrasse (Ctenolabrus rupestris), a small marine fish inhabiting coastal waters of ... -
Genome architecture enables local adaptation of Atlantic cod despite high connectivity
Barth, Julia Maria Isis; Berg, Paul Ragnar; Jonsson, Per R; Bonanomi, Sara; Corell, Hanna; Hemmer-Hansen, Jakob; Jakobsen, Kjetill Sigurd; Johannesson, Kerstin; Jorde, Per Erik; Knutsen, Halvor; Moksnes, Per-Olav; Star, Bastiaan; Stenseth, Nils Christian; Svedang, Henrik; Jentoft, Sissel; Andre, Carl (Journal article; Peer reviewed, 2017)Adaptation to local conditions is a fundamental process in evolution; however, mechanisms maintaining local adaptation despite high gene flow are still poorly understood. Marine ecosystems provide a wide array of diverse ... -
Genome architecture enables local adaptation of Atlantic cod despite high connectivity
Barth, Julia Maria Isis; Berg, Paul Ragnar; Jonsson, Per R; Bonanomi, Sara; Corell, Hanna; Hemmer-Hansen, Jakob; Jakobsen, Kjetill Sigurd; Johannesson, Kerstin; Jorde, Per Erik; Knutsen, Halvor; Moksnes, Per-Olav; Star, Bastiaan; Stenseth, Nils Christian; Svedang, Henrik; Jentoft, Sissel; Andre, Carl (Journal article; Peer reviewed, 2017)Adaptation to local conditions is a fundamental process in evolution; however, mechanisms maintaining local adaptation despite high gene flow are still poorly understood. Marine ecosystems provide a wide array of diverse ... -
Genotype Reconstruction of Paternity in European Lobsters (Homarus gammarus)
Ellis, Charlie; Hodgson, DJ; Andre, Carl; Sørdalen, Tonje Knutsen; Knutsen, Halvor; Griffiths, Amber (Peer reviewed; Journal article, 2015) -
Geographic variation in gene flow from a genetically distinct migratory ecotype drives population genetic structure of coastal Atlantic cod (Gadus morhua L.)
Seliussen, Bjørghild Breistein; Dahle, Geir; Johansen, Torild; Besnier, Francois; Quintela, Maria; Jorde, Per Erik; Knutsen, Halvor; Westgaard, Jon-Ivar; Nedreaas, Kjell Harald; Farestveit, Eva; Glover, Kevin Alan (Peer reviewed; Journal article, 2022)Identifying how physical and biotic factors shape genetic connectivity among populations in time and space is essential to our understanding of the evolutionary trajectory as well as the management of marine species. ... -
Habitat discontinuities separate genetically divergent populations of a rocky shore marine fish
Blanco Gonzalez, Enrique; Knutsen, Halvor; Jorde, Per Erik (Journal article, 2016) -
Harvest pressure on coastal atlantic cod (Gadus morhua) from recreational fishing relative to commercial fishing assessed from tag-recovery data
Kleiven, Alf Ring; Chacon, Albert Fernandez; Nordahl, Jan-Harald; Moland, Even; Espeland, Sigurd Heiberg; Knutsen, Halvor; Olsen, Esben Moland (Journal article; Peer reviewed, 2016-03-09)Marine recreational fishing is a popular outdoor activity. However, knowledge about the magnitude of recreational catches relative to commercial catches in coastal fisheries is generally sparse. Coastal Atlantic cod (Gadus ...