Blar i Brage IMR på forfatter "Johansen, Torild"
-
Hierarchical genetic structure in an evolving species complex: insights from genome wide ddRAD data in Sebastes mentella
Saha, Atal; Kent, Matthew; Hauser, Lorenz; Drinan, Daniel P.; Nielsen, Einar E.; Westgaard, Jon-Ivar; Lien, Sigbjørn; Johansen, Torild (Dataset, 2021)This is the dataset used in Saha et al study "Hierarchical genetic structure in an evolving species complex: insights from genome wide ddRAD data in Sebastes mentella", published in Plos one. File Contents F1 This ... -
Linking dispersal connectivity to population structure and management boundaries for saithe in the Northeast Atlantic
Myksvoll, Mari Skuggedal; Devine, Jennifer Ann; Quintela, Maria; Geffen, Audrey J.; Nash, Richard David Marriott; Sandvik, Anne Dagrun; Besnier, Francois; Saha, Atal; Dahle, Geir; Jansson, Eeva; Nedreaas, Kjell Harald; Johansen, Torild (Peer reviewed; Journal article, 2021)Population connectivity is an increasingly important focal area for the understanding of how marine fish populations respond to anthropogenic pressures like climate change and fisheries. Our model species, the saithe ... -
Linking tagging technology and molecular genetics to gain insight in the spatial dynamics of two stocks of cod in Northeast Atlantic waters
Michalsen, Kathrine; Johansen, Torild; Johannesen, Edda (ICES CM documents, Working paper, 2006)The Northeast Arctic cod (Gadus morhua L.: NEAC) is thought to be the most abundant cod stock in the North Atlantic, while the catches of the partially co-occurring Norwegian coastal cod (NCC) stocks have dramatically ... -
Maximizing sampling efficiency to detect differences in fish community composition using environmental DNA metabarcoding in subarctic fjords
Guri, Gledis; Westgaard, Jon-Ivar; Yoccoz, Nigel; Wangensteen, Owen S.; Præbel, Kim; Ray, Jessica Louise; Kelly, Ryan P.; Shelton, Andrew Olaf; Hanebrekke, Tanja Lexau; Johansen, Torild (Peer reviewed; Journal article, 2023)Environmental DNA (eDNA) has gained popularity as a tool for ecosystem biomonitoring and biodiversity assessment. Although much progress has been made regarding laboratory and fieldwork protocols, the issue of sampling ... -
Mechanisms and consequences of life cycle diversity of beaked redfish, Sebastes mentella
Cadrin, Steven X.; Bernreuther, Matthias; Daníelsdóttir, Anna Kristín; Hjörleifsson, Einar; Johansen, Torild; Kerr, Lisa; Kristinsson, Kristjan; Mariani, Stefano; Pampoulie, Christophe; Reinert, Jákup; Saborido-Rey, Fran; Sigurdsson, Thorsteinn; Stransky, Christoph (ICES CM documents;2009/H:01, Working paper, 2009)Recent genetic research, supported by life history information, indicates that there are three biological stocks of S. mentella in the Irminger Sea and adjacent waters: a ‘Deep Pelagic’ stock (>500m), a ‘Shallow Pelagic’ ... -
Migration patterns of Greenland halibut in the North Atlantic revealed by a compiled mark-recapture dataset
Vihtakari, Mikko; Elvarsson, Bjarki Pór; Treble, Margaret; Nogueira, Adriana; Hedges, Kevin; Hussey, Nigel E.; Wheeland, Laura; Roy, Denis; Ofstad, Lise Helen; Hallfredsson, Elvar Halldor; Barkley, Amanda; Estevez-Barcia, Daniel; Nygaard, Rasmus; Healey, Brian; Steingrund, Petur; Johansen, Torild; Albert, Ole Thomas; Boje, Jesper (Peer reviewed; Journal article, 2022)Marine fisheries are often allocated to stocks that reflect pragmatic considerations and may not represent the species’ spatial population structure, increasing the risk of mismanagement and unsustainable harvesting. Here ... -
Morphology of Arctic cod (Boreogadus saida) assessed according to habitat preference and age in the Beaufort Sea
Malizia, Juliano; Launay, Marie; Bruvold, Ingrid Marie; Quintela, Maria; Johansen, Torild; Reist, James D.; Majewski, Andrew R.; Roy, Denis (Peer reviewed; Journal article, 2023)The Arctic cod (Boreogadus saida (Lepechin, 1774)) represents the most widespread and abundant fish in the Arctic and is a critical trophic link in its ecosystems. Like many species endemic to the region, it has lost ... -
Movement diversity and partial sympatry of coastal and Northeast Arctic cod ecotypes at high latitudes
Strøm, John Fredrik; Bøhn, Thomas; Skjæraasen, Jon Egil; Gjelland, Karl Øystein; Karlsen, Ørjan; Johansen, Torild; Hanebrekke, Tanja Lexau; Bjørn, Pål Arne; Olsen, Esben Moland (Peer reviewed; Journal article, 2023)Movement diversity within species represent an important but often neglected, component of biodiversity that affects ecological and genetic interactions, as well as the productivity of exploited systems. By combining ... -
Movement diversity and partial sympatry of coastal and Northeast Arctic cod ecotypes at high latitudes
Strøm, John Fredrik; Bøhn, Thomas; Skjæraasen, Jon Egil; Gjelland, Karl Øystein; Karlsen, Ørjan; Johansen, Torild; Hanebrekke, Tanja Lexau; Bjørn, Pål Arne; Olsen, Esben Moland (Peer reviewed; Journal article, 2023)Movement diversity within species represent an important but often neglected, component of biodiversity that affects ecological and genetic interactions, as well as the productivity of exploited systems. By combining ... -
New evidence for the establishment of coastal cod Gadus morhua in Svalbard fjords
Spotowitz, Lisa; Johansen, Torild; Hansen, Agneta; Berg, Erik; Stransky, Christoph; Fischer, Philipp (Peer reviewed; Journal article, 2022)The Arctic is experiencing increasing water temperatures, leading to a northward shift of Atlantic species into Arctic waters. Arctic marine ecosystems are therefore subject to substantial changes in species distributions ... -
The pantophysin gene and its relationship with survival in early life stages of Atlantic cod: Pantophysin in Atlantic cod
Otterå, Håkon Magne; Johansen, Torild; Folkvord, Arild; Dahle, Geir; Bingh, Marte Kristine Solvang; Westgaard, Jon-Ivar; Glover, Kevin (Peer reviewed; Journal article, 2020)Genetic markers are widely used in fisheries management around the world. While the genetic structure and markers selected are usually based on samples from the wild, very few controlled experiments have been carried out ... -
Population genetic structure of grey seals (Halichoerus grypus) : Diversity, differentiation and prospects for genetic population assignment with special reference to Norwegian waters
Frie, Anne Kirstine; Delghandi, Madjid; Johansen, Torild (ICES CM documents;2007/L:25, Working paper, 2007)Population structure of grey seal breeding colonies in Norway (n=300), Northwest Russia (n=40) and Scotland (n=100) is currently being investigated based on Mt-DNA control region sequencing and fragment analysis (8 ... -
Population Genetic Structure of the Spotted Wolffish, Anarhichas minor, in the North Atlantic
Imsland, Albert K.; Stensland, Karen; Johansen, Torild; Le Francois, Nathalie; Lamarre, Simon; Nævdal, Gunnar; Foss, Atle (Journal article; Peer reviewed, 2008)The genetic population structure of spotted wolffish Anarhichas minor (Olafsen) in the North Atlantic was investigated by allozyme electrophoresis and by PCR based RFLP variation in mtDNA. Samples were collected from five ... -
Population structure and connectivity in the genus Molva in the Northeast Atlantic
McGill, L.; McDevitt, A.D.; Hellemans, B.; Neat, F.; Knutsen, Halvor; Mariani, S.; Christiansen, Henrik; Johansen, Torild; Volckaert, F.A.M.; Coscia, I. (Peer reviewed; Journal article, 2023)In fisheries, operational management units and biological data often do not coincide. In many cases, this is not even known due to the lack of information about a species’ population structure or behaviour. This study ... -
Population structure discovered in juveniles of Greenland halibut (Reinhardtius hippoglossoides Walbaum, 1792)
Gíslason, Davíð; Estévez-Barcia, Daniel; Sveinsson, Sæmundur; Hansen, Agneta; Roy, Denis; Treble, Margaret; Boje, Jesper; Vihtakari, Mikko; Elvarsson, Bjarki Þór; Hedges, Kevin; Hallfredsson, Elvar Halldor; Johansen, Torild (Peer reviewed; Journal article, 2023)Understanding the genetic differentiation among populations of most marine fish requires investigating the differences among spawning grounds. However, this can be challenging as spawning grounds for some species are not ... -
“Real-time” genetic monitoring of a commercial fishery on the doorstep of an MPA reveals unique insights into the interaction between coastal and migratory forms of the Atlantic cod
Johansen, Torild; Westgaard, Jon-Ivar; Seliussen, Bjørghild Breistein; Nedreaas, Kjell Harald; Dahle, Geir; Glover, Kevin; Kvalsund, Roger; Aglen, Asgeir (Journal article; Peer reviewed, 2017)With the decline of many of the world’s fisheries, increased regulation, including marine protected areas (MPA), forms an increasingly important role in promoting sustainable resource use. Here, we present a novel “real-time” ... -
The making of a genetic cline: introgression of oceanic genes into coastal cod populations in the Northeast Atlantic
Jorde, Per Erik; Huserbråten, Mats Brockstedt Olsen; Seliussen, Bjørghild Breistein; Myksvoll, Mari Skuggedal; Vikebø, Frode Bendiksen; Dahle, Geir; Aglen, Asgeir; Johansen, Torild (Peer reviewed; Journal article, 2021)Abstract: Coastal Atlantic cod (Gadus morhua) in the Northeast Atlantic has seen a continuous decline since the industrialization of the coastal fishery, and management needs to address the spatial and temporal complexities ...