Blar i Brage IMR på forfatter "Johansen, Torild"
-
Analysis of coastal cod (Gadus morhua L.) sampled on spawning sites reveals a genetic gradient throughout Norway's coastline
Dahle, Geir; Quintela, María; Johansen, Torild; Westgaard, Jon-Ivar; Besnier, Francois; Aglen, Asgeir; Jørstad, Knut Eirik; Glover, Kevin (Journal article; Peer reviewed, 2018)Atlantic cod (Gadus morhua L.) has formed the basis of many economically significant fisheries in the North Atlantic, and is one of the best studied marine fishes, but a legacy of overexploitation has depleted populations ... -
Blålangegenetikk – Genetiske undersøkelser av blålange langs Eggakanten og i utvalgte fjorder
Helle, Kristin; Sanchez, Maria Quintela; Johansen, Torild (Rapport fra havforskningen;20-2018, Research report, 2018)Et intenst fiskepress på blålange på 1970- og 1980-tallet førte til alvorlig overbeskatning. Bestanden synes å være i så dårlig forfatning at den i 2006 ble satt på den norske Rødlisten. For å sikre gjenoppbygging av ... -
Contaminants reach everywhere: Fish dietary samples should be surface decontaminated prior to molecular diet analysis
Rijal, Dilli Prasad; Hanebrekke, Tanja Lexau; Arneberg, Per; Johansen, Torild; Sint, Daniela; Traugott, Michael; Skern-Mauritzen, Mette; Westgaard, Jon-Ivar (Peer reviewed; Journal article, 2023)Knowledge of trophic interaction is necessary to understand the dynamics of ecosystems and develop ecosystem-based management. The key data to measure these interactions should come from large-scale diet analyses with good ... -
Distinct genetic clustering in the weakly differentiated polar cod, Boreogadus saida Lepechin, 1774 from East Siberian Sea to Svalbard
Sanchez, Maria Quintela; Bhat, Shripathi; Præbel, Kim; Gordeeva, Natalia; Seljestad, Gaute Wilhelmsen; Hanebrekke, Tanja Lexau; Mateos-Rivera, Alejandro; Vikebø, Frode Bendiksen; Zelenia, Daria; Cheng, Chi-Hing Christina; Johansen, Torild (Peer reviewed; Journal article, 2021)The cold-adapted polar cod Boreogadus saida, a key species in Arctic ecosystems, is vulnerable to global warming and ice retreat. In this study, 1257 individuals sampled in 17 locations within the latitudinal range of ... -
Electrophoretic studies of redfish (Genus sebastes) from Icelandic and Greenland waters
Nedreaas, Kjell Harald; Nævdal, Gunnar; Johansen, Torild (ICES CM Documents;1992/G:36, Working paper, 1992)Sebastes spp. from Icelandic and Greenland waters were analysed for biochemical genetic variation by agar gel and starch gel electrophoresis. The main emphasize was put on S. marinus, but the oceanic type S. mentella ... -
Farmed cod escapees and net-pen spawning left no clear genetic footprint in the local wild cod population.
Varne, Rebekka; Kunz, Kristina Lore; Johansen, Torild; Westgaard, Jon-Ivar; Uglem, Ingebrigt; Mork, Jarle (Journal article; Peer reviewed, 2015-11-18)This study investigated a potential genetic introgression from farmed to wild cod Gadus morhua L. in the Trondheimsfjord, Norway. During the first 2 yr of operation of a cod farm in the inner part of the fjord, 2 large ... -
Genetic assignment as a tool to identify the origin for Atlantic cod (Gadus morhua) escapees in Norwegian fjords
Dahle, Geir; Jørstad, Knut Eirik; Johansen, Torild; Westgaard, Jon-Ivar; Knutsen, Halvor; Glover, Kevin A. (ICES CM documents;2009/Q:14, Working paper, 2009) -
Genetic differentiation between inshore and offshore populations of northern shrimp (Pandalus borealis)
Hansen, Agneta; Westgaard, Jon-Ivar; Søvik, Guldborg; Hanebrekke, Tanja; Nilssen, Einar Magnus; Jorde, Per Erik; Albretsen, Jon; Johansen, Torild (Dataset, 2021-07-18)This is the dataset used in Hansen et al study " Genetic differentiation between inshore and offshore populations of northern shrimp (Pandalus borealis)", published in ICES Journal of Marine Science. File Contents F1 ... -
Genetic differentiation between inshore and offshore populations of northern shrimp (Pandalus borealis)
Hansen, Agneta; Westgaard, Jon-Ivar; Søvik, Guldborg; Hanebrekke, Tanja Lexau; Nilssen, Einar Magnus; Jorde, Per Erik; Albretsen, Jon; Johansen, Torild (Peer reviewed; Journal article, 2021)Many marine organisms have a permanent presence both inshore and offshore and spawn in multiple areas, yet their status as separate populations or stocks remain unclear. This is the situation for the northern shrimp (Pandalus ... -
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 management of mixed-stock fisheries "real-time": The case of the largest remaining cod fishery operating in the Atlantic in 2007-2017
Dahle, Geir; Johansen, Torild; Westgaard, Jon-Ivar; Aglen, Asgeir; Glover, Kevin (Journal article; Peer reviewed, 2018)Fish stocks represent fundamental units in fisheries management, and their identification, especially in mixed-fisheries, represents one of the primary challenges to sustainable harvest. Here, we describe the first “real-time” ... -
Genetic population structure in Norway lobster (Nephrops norvegicus): management regime under panmixia
Westgaard, Jon-Ivar; Johansen, Torild; Søvik, Guldborg (Peer reviewed; Journal article, 2023)Investigations of genetic stock structure sometimes reveal a mismatch between management units and biological units. In Scandinavian waters, Norway lobster (Nephrops norvegicus) is divided into two management units (the ... -
Genetic population structure in Norway lobster (Nephrops norwegicus): Management regime under panmixia
Westergaard, Jon-Ivar; Søvik, Guldborg; Johansen, Torild (Dataset, 2022)The files contain the data behind the article “Genetic population structure in Norway lobster (Nephrops norwegicus): Management regime under panmixia” published in ICES Journal of Marine Science -
Genetic structure of Sufflogobius bibarbatus in the Benguela upwelling ecosystem using microsatellite markers
Gunawickrama, Kristogu Baduge Suneetha; Delaval, Aurelien Nicolas; Johansen, Torild; van der Plas, Anja; Salvanes, Anne Gro Vea (Peer reviewed; Journal article, 2020)The bearded goby Sufflogobius bibarbatus is an abundant endemic small fish species on the continental shelf of the northern Benguela. The goby habitat is characterised by generally low bottom oxygen concentrations that ... -
Genomic analysis reveals neutral and adaptive patterns that challenge the current management regime for East Atlantic cod Gadus morhua L
Johansen, Torild; Besnier, Francois; Sanchez, Maria Quintela; Jorde, Per Erik; Glover, Kevin; Westgaard, Jon-Ivar; Dahle, Geir; Lien, Sigbjørn; Kent, Matthew Peter (Peer reviewed; Journal article, 2020)Challenging long‐held perceptions of fish management units can help to protect vulnerable stocks. When a fishery consisting of multiple genetic stocks is managed as a single unit, overexploitation and depletion of minor ... -
Genomic signatures of local adaptation in natural populations of Atlantic cod: implications for interactions between aquaculture and wild cod populations
Nielsen, Einar E.; Hemmer-Hansen, Jakob; Poulsen, Nina A.; Loeschcke, Volker; Moen, Thomas; Johansen, Torild; Mittelholzer, Christian; Taranger, Geir Lasse; Ogden, Rob; Carvalho, Gary R. (ICES CM documents;2009/Q:17, Working paper, 2009) -
Geographic extent of introgression in Sebastes mentella and its effect on genetic population structure
Saha, Atal; Johansen, Torild; Hedeholm, Rasmus; Nielsen, Einar Eg; Westgaard, Jon-Ivar; Hauser, Lorenz; Planque, Benjamin; Cadrin, Steven X.; Boje, Jesper (Peer reviewed; Journal article, 2017) -
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. ... -
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; Sanchez, Maria Quintela; Jorde, Per Erik; Knutsen, Halvor; Westgaard, Jon-Ivar; Nedreaas, Kjell; Farestveit, Eva; Glover, Kevin (Dataset, 2022)This is the final dataset used in the Breistein et al. (in review) study “Geographic variation in gene-flow from a genetically distinct migratory ecotype drives population genetic structure of coastal Atlantic cod (Gadus ... -
Hierarchical genetic structure in an evolving species complex: Insights from genome wide ddRAD data in Sebastes mentella
Saha, Atal; Kent, Matthew Peter; Hauser, Lorenz; Drinan, Daniel P.; Nielsen, Einar E.; Westgaard, Jon-Ivar; Lien, Sigbjørn; Johansen, Torild (Peer reviewed; Journal article, 2021)The diverse biology and ecology of marine organisms may lead to complex patterns of intraspecific diversity for both neutral and adaptive genetic variation. Sebastes mentella displays a particular life-history as livebearers, ...