Browsing Published externally by Author "Bogstad, Bjarte"
Now showing items 1-20 of 39
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A review of the battle for food in the Barents Sea: cod vs. marine mammals
Bogstad, Bjarte; Gjøsæter, Harald; Haug, Tore; Lindstrøm, Ulf (Journal article; Peer reviewed, 2015-03-25)Cod, harp seal and minke whale are the main top predators in the Barents Sea ecosystem. In the last decade, the abundance of cod has increased considerably, and is at a record high level. In spite of this, the growth and ... -
An appraisal of the drivers of Norwegian spring‐spawning herring (Clupea harengus) recruitment
Garcia, Théo; Planque, Benjamin; Arneberg, Per; Bogstad, Bjarte; Skagseth, Øystein; Tiedemann, Maik (Peer reviewed; Journal article, 2020) -
Balanced harvesting in a variable and uncertain world – a case study from the Barents Sea.
Howell, Daniel; Hansen, Cecilie; Bogstad, Bjarte; Skern-Mauritzen, Mette (Journal article; Peer reviewed, 2016-03-21) -
Barents Sea cod (Gadus morhua) diet composition: long-term interannual, seasonal, and ontogenetic patterns
Holt, Rebecca Emma; Bogstad, Bjarte; Durant, Joel Marcel; Dolgov, Andrey; Ottersen, Geir (Journal article; Peer reviewed, 2019)Atlantic cod (Gadus morhua) is an ecologically and commercially important species in the North-Atlantic region. Cod is a top predator and information on its trophic ecology is integral for understanding predator–prey ... -
Cannibalism and year-class strength in Atlantic cod (Gadus morhua L.) in Arcto-boreal ecosystems (Barents Sea, Iceland, and eastern Newfoundland)
Bogstad, Bjarte; Lilly, George R.; Mehl, Sigbjørn; Palsson, Olafur K.; Stefánsson, Gunnar (ICES Marine Science Symposia, Journal article; Peer reviewed, 1994)Stomach content data collected from cod caught during offshore resource assessment surveys in three Arcto-boreal ecosystems (the Barents Sea and the shelves off Iceland and eastern Newfoundland) were examined to determine ... -
Changes in the relationship between sea temperature and recruitment of cod, haddock and herring in the Barents Sea
Bogstad, Bjarte; Dingsør, Gjert Endre; Ingvaldsen, Randi; Gjøsæter, Harald (Journal article; Peer reviewed, 2013-06-14)Cod, haddock and herring in the Barents Sea have strongly variable recruitment. For these three stocks, earlier studies have suggested a high correlation between their recruitment and a positive relationship between high ... -
Climate based multi-year predictions of the Barents Sea cod stock.
Årthun, Marius; Bogstad, Bjarte; Daewel, Ute; Keenlyside, Noel; Sandø, Anne Britt; Schrum, Corinna; Ottersen, Geir (Journal article; Peer reviewed, 2018)Predicting fish stock variations on interannual to decadal time scales is one of the major issues in fisheries science and management. Although the field of marine ecological predictions is still in its infancy, it is ... -
Consumption of juvenile herring (Clupea harengus) by cod (Gadus morhua) in the Barents Sea: a new approach to estimating consumption in piscivorous fish
Johansen, Geir Odd; Bogstad, Bjarte; Mehl, Sigbjørn; Ulltang, Øyvind (Journal article; Peer reviewed, 2004)Consumption of different age groups of juvenile, Norwegian, spring-spawning herring (Clupea harengus) by northeast Arctic cod (Gadus morhua) in the Barents Sea in 1992–1997 is estimated using cod stomach content data. We ... -
Diets of the Barents Sea cod (Gadus morhua) from the 1930s to 2018
Townhill, Bryony; Holt, Rebecca Emma; Bogstad, Bjarte; Durant, Joël; Pinnegar, John K.; Dolgov, Andrey V.; Yaragina, Natalia A.; Johannesen, Edda; Ottersen, Geir (Peer reviewed; Journal article, 2021)A new dataset on the diet of Atlantic cod in the Barents Sea from the 1930s to the present day has been compiled to produce one of the largest fish diet datasets available globally. Atlantic cod is one of the most ecologically ... -
Diets of the Barents Sea cod (Gadus morhua) from the 1930s to 2018
Townhill, Bryony; Holt, Rebecca Emma; Bogstad, Bjarte; Durant, Jo l M.; Pinnegar, John K.; Dolgov, Andrey V.; Yaragina, Natalia A.; Johannesen, Edda; Ottersen, Geir (Peer reviewed; Journal article, 2021)A new dataset on the diet of Atlantic cod in the Barents Sea from the 1930s to the present day has been compiled to produce one of the largest fish diet datasets available globally. Atlantic cod is one of the most ecologically ... -
Distribution of rorquals and Atlantic cod in relation to their prey in the Norwegian high Arctic
Solvang, Hiroko K.; Haug, Tore; Knutsen, Tor; Gjøsæter, Harald; Bogstad, Bjarte; Hartvedt, Siri; Øien, Nils; Lindstrøm, Ulf (Peer reviewed; Journal article, 2021)Recent warming in the Barents Sea has led to changes in the spatial distribution of both zooplankton and fish, with boreal communities expanding northwards. A similar northward expansion has been observed in several rorqual ... -
Do abiotic mechanisms determine interannual variability in length-at-age of juvenile Arcto-Norwegian cod?
Ottersen, Geir; Helle, Kristin; Bogstad, Bjarte (Journal article; Peer reviewed, 2002)For the large Arcto-Norwegian stock of cod (Gadus morhua L.) in the Barents Sea, year-to-year variability in growth is well documented. Here three hypotheses for the observed inverse relation between abundance and the mean ... -
Feeding in a heterogeneous environment: spatial dynamics in summer foraging Barents Sea cod
Johannesen, Edda; Lindstrøm, Ulf; Michalsen, Kathrine; Skern-Mauritzen, Mette; Fauchald, Per; Bogstad, Bjarte; Dolgov, Andrey V. (Journal article; Peer reviewed, 2012-07-03)Cod Gadus morhua are important predators in many ecosystems in the North Atlantic, but their ecological importance has diminished in many areas due to stock size reductions. In contrast, the Barents Sea cod stock is ... -
Feeding of mature cod (Gadus morhua) on the spawning grounds in Lofoten
Michalsen, Kathrine; Johannesen, Edda; Bogstad, Bjarte (Journal article; Peer reviewed, 2008-03-19)Many authors state that cod (Gadus morhua) do not feed during the spawning period. However, this more or less established fact has rarely been investigated in the field. Here, the content of stomachs from Northeast Arctic ... -
Growth portfolios buffer climate-linked environmental change in marine systems
Campana, Steven E.; Smolinski, Szymon; Black, Bryan A.; Morrongiello, John R.; Alexandroff, Stella J.; Andersson, Carin; Bogstad, Bjarte; Butler, Paul G.; Denechaud, Côme; Frank, David C.; Geffen, Audrey J.; Godiksen, Jane Aanestad; Grønkjær, Peter; Hjörleifsson, Einar; Jónsdóttir, Ingibjörg G.; Meekan, Mark; Mette, Madelyn; Tanner, Susanne E.; van der Sleen, Peter; von Leesen, Gotje (Peer reviewed; Journal article, 2022)Large-scale, climate-induced synchrony in the productivity of fish populations is becoming more pronounced in the world's oceans. As synchrony increases, a population's “portfolio” of responses can be diminished, in turn ... -
Growth portfolios buffer climate-linked environmental change in marine systems
Campana, Steven E.; Smolinski, Szymon; Black, Bryan A.; Morrongiello, John R.; Alexandroff, Stella J.; Andersson, Carin; Bogstad, Bjarte; Butler, Paul G.; Denechaud, Côme; Frank, David C.; Geffen, Audrey J.; Godiksen, Jane Aanestad; Grønkjær, Peter; Hjörleifsson, Einar; Jónsdóttir, Ingibjörg G.; Meekan, Mark; Mette, Madelyn; Tanner, Susanne E.; van der Sleen, Peter; von Leesen, Gotje (Peer reviewed; Journal article, 2022)Large-scale, climate-induced synchrony in the productivity of fish populations is becoming more pronounced in the world's oceans. As synchrony increases, a population's “portfolio” of responses can be diminished, in turn ... -
Highly mixed impacts of near-future climate change on stock productivity proxies in the North East Atlantic
Kjesbu, Olav Sigurd; Sundby, Svein; Sandø, Anne Britt; Alix, Maud; Hjøllo, Solfrid Sætre; Tiedemann, Maik; Skern-Mauritzen, Mette; Junge, Claudia; Fossheim, Maria; Broms, Cecilie; Søvik, Guldborg; Zimmermann, Fabian; Nedreaas, Kjell Harald; Eriksen, Elena; Höffle, Hannes; Hjelset, Ann Merete; Kvamme, Cecilie; Reecht, Yves; Knutsen, Halvor; Aglen, Asgeir; Albert, Ole Thomas; Berg, Erik; Bogstad, Bjarte; Durif, Caroline; Halvorsen, Kim Aleksander Tallaksen; Høines, Åge Sigurd; Hvingel, Carsten; Johannesen, Edda; Johnsen, Espen; Moland, Even; Myksvoll, Mari Skuggedal; Nøttestad, Leif; Olsen, Erik Joel Steinar; Skaret, Georg; Skjæraasen, Jon Egil; Slotte, Aril; Staby, Arved; Stenevik, Erling Kåre; Stiansen, Jan Erik; Stiasny, Martina H.; Sundet, Jan Henry; Vikebø, Frode Bendiksen; Huse, Geir (Peer reviewed; Journal article, 2021)Impacts of climate change on ocean productivity sustaining world fisheries are predominantly negative but vary greatly among regions. We assessed how 39 fisheries resources—ranging from data-poor to data-rich stocks—in the ... -
Jan Mayen—a new spawning and fishing area for Atlantic cod Gadus morhua
Bogstad, Bjarte (Peer reviewed; Journal article, 2022)In 2018, commercially exploitable concentrations of Atlantic cod Gadus morhua were found on the shelf around the Arctic island Jan Mayen (7 1°N, 8–9 °W) and in 2019–2021 an exploratory cod fishery with longline was carried ... -
Long-term interplay between harvest regimes and biophysical conditions may lead to persistent changes in age at sexual maturity of Northeast Arctic cod (Gadus morhua)
Carl Jacob, Rørvik; Bogstad, Bjarte; Ottersen, Geir; Kjesbu, Olav Sigurd (Peer reviewed; Journal article, 2022)This investigation commenced by constructing principal maturation schedule equations as a function of fishing mortality (F), key biophysical factors and a term attributed to fisheries-induced adaptive change (FIAC). Following ... -
Match-mismatch dynamics in the Norwegian-Barents Sea system
Ferreira, Ana Sofia De Araújo; Stige, Leif Christian; Neuheimer, Anna B.; Bogstad, Bjarte; Yaragina, Natalia A.; Prokopchuk, Irina; Durant, Joel Marcel (Peer reviewed; Journal article, 2020)A key process affecting variation in the recruitment of fish into fisheries is the spatio-temporal overlap between prey and predator (match-mismatch hypothesis, MMH). The Northeast Arctic cod Gadus morhua and its dominant ...