Browsing Brage IMR by Author "Ottersen, Geir"

Now showing items 1-20 of 76

    • A participatory scenario method to explore the future of marine social‐ecological systems 

      Planque, Benjamin; Mullon, Christian; Arneberg, Per; Eide, Arne; Fromentin, Jean-Marc; Heymans, Johanna J; Hoel, Alf Håkon; Niiranen, Susa; Ottersen, Geir; Sandø, Anne Britt; Sommerkorn, Martin; Thébaud, Olivier; Thorvik, Thorbjørn (Journal article; Peer reviewed, 2019)
      Anticipating future changes in marine social‐ecological systems (MSES) several decades into the future is essential in the context of accelerating global change. This is challenging in situations where actors do not share ...

    • Ambient temperature and distribution of northeast arctic cod 

      Ottersen, Geir; Michalsen, Kathrine; Nakken, Odd (ICES CM documents, Working paper, 1996)
      Most studies on the effects of field temperature on fish distribution and population parameters have considered the temperature and its variability at fixed stations or sections rather than the temperature in the actual ...

    • 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 ...

    • Bridging the gap between aquatic and terrestrial ecology 

      Stergiou, Konstantinos I.; Browman, Howard I.; Stenseth, Nils Christian; Mysterud, Atle; Durant, Joël M.; Hjermann, Dag Ø.; Ottersen, Geir (Journal article; Peer reviewed, 2005-12-08)

    • Climate and the match or mismatch between predator requirements and resource availability 

      Durant, Joël M.; Hjermann, Dag Ø.; Ottersen, Geir; Stenseth, Nils Christian (Journal article; Peer reviewed, 2007-04-20)
      Climate influences a population through a variety of processes, including reproduction, growth, migration patterns and phenology. Climate may operate either directly through metabolic and reproductive processes or indirectly ...

    • 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 ...

    • Climate change impacts on polar marine ecosystems: Toward robust approaches for managing risks and uncertainties 

      Ottersen, Geir; Constable, Andrew J.; Hollowed, Anne B.; Holsman, Kristin K.; Melbourne-Thomas, Jess; Muelbert, Mônica M.C.; Skern-Mauritzen, Mette (Peer reviewed; Journal article, 2022)
      The Polar Regions chapter of the Intergovernmental Panel on Climate Change's Special Report on the Ocean and Cryosphere in a Changing Climate (SROCC) provides a comprehensive assessment of climate change impacts on polar ...

    • Climate Change Impacts on Polar Marine Ecosystems: Toward Robust Approaches for Managing Risks and Uncertainties 

      Ottersen, Geir; Constable, Andrew J.; Hollowed, Anne B.; Holsman, Kirstin K.; Jess, Melbourne-Thomas; Muelbert, Mônica M. C.; Skern-Mauritzen, Mette (Peer reviewed; Journal article, 2022)
      The Polar Regions chapter of the Intergovernmental Panel on Climate Change's Special Report on the Ocean and Cryosphere in a Changing Climate (SROCC) provides a comprehensive assessment of climate change impacts on polar ...

    • Climatic effects filtered through the food web affect the dynamics of Arcto-Norwegian cod 

      Hjermann, Dag Ø.; Eikeset, Anne Maria; Bogstad, Bjarte; Ottersen, Geir; Stenseth, Nils Christian (ICES CM documents, Working paper, 2005)
      The world's largest cod stock, the Arcto-Norwegian cod (a.k.a. North-East Arctic cod), is heavily influenced by temperature in two ways: First, cod recruitment tends to be high when Barents Sea temperature in the spawning ...

    • Cod and climate variability in the Barents Sea 

      Dippner, Joachim W.; Ottersen, Geir (Journal article; Peer reviewed, 2001)
      Interannual variability of temperature in the Kola section (Barents Sea) and the abundance as 0-group (age 5 mo) and recruits (age 3 yr), spawning stock biomass, and survival of Arcto-Norwegian cod in the Barents Sea were ...

    • Cod and climate: effect of the North Atlantic Oscillation on recruitment in the North Atlantic 

      Stige, Leif Christian; Ottersen, Geir; Brander, Keith; Chan, Kung-Sik; Stenseth, Nils Christian (Journal article; Peer reviewed, 2006-11-07)
      The impact of the environment on interannual variability in fish recruitment has proven difficult to establish empirically, and environment-recruitment correlations have often been found to break down when more data become ...

    • Combined effects of fishing and oil spills on marine fish: Role of stock demographic structure for offspring overlap with oil 

      Stige, Leif Christian; Ottersen, Geir; Yaragina, Nathalia A.; Vikebø, Frode Bendiksen; Stenseth, Nils Christian; Langangen, Øystein (Journal article; Peer reviewed, 2018)
      It has been proposed that the multiple pressures of fishing and petroleum activities impact fish stocks in synergy, as fishing-induced demographic changes in a stock may lead to increased sensitivity to detrimental effects ...

    • Combining hydrographical particles-tracking models with spatial analyses to evaluate spatial dynamics of cod larvae and 0-group in the Barents Sea 

      Hidalgo, Manuel; Gusdal, Yvonne; Dingsør, Gjert Endre; Ciannelli, Lorenzo; Hjermann, Dag Ø.; Ottersen, Geir; Stige, Leif Christian; Fossum, Ingerid; Melsom, Arne; Stenseth, Nils Christian (ICES CM Documents;2009/C:06, Working paper, 2009)
      Recruitment ecology of cod has been an important focus within the framework of GLOBEC. A large part of this work focused on understanding the spatiotemporal component of cod populations. For the early pelagic life stages, ...

    • Contrasting effects of rising temperatures on trophic interactions in marine ecosystems 

      Durant, Joel Marcel; Molinero, Juan Carlos; Ottersen, Geir; Reygondeau, Gabriel; Stige, Leif Christian; Langangen, Øystein (Journal article; Peer reviewed, 2019)
      In high-latitude marine environments, primary producers and their consumers show seasonal peaks of abundance in response to annual light cycle, water column stability and nutrient availability. Predatory species have adapted ...

    • Contrasting effects of rising temperatures on trophic interactions in marine ecosystems 

      Durant, Joel Marcel; Molinero, Juan Carlos; Ottersen, Geir; Reygondeau, Gabriel; Stige, Leif Christian; Langangen, Øystein (Journal article; Peer reviewed, 2019)
      In high-latitude marine environments, primary producers and their consumers show seasonal peaks of abundance in response to annual light cycle, water column stability and nutrient availability. Predatory species have adapted ...

    • Current patterns during pelagic stages determine interannual variability in length-at-age of juvenile Arcto-Norwegian cod 

      Ottersen, Geir; Helle, Kristin; Bogstad, Bjarte (ICES CM documents, Working paper, 2001)

    • Decline and Recovery of Atlantic Cod (Gadus morhua) Stocks throughout the North Atlantic 

      Lilly, George R.; Wieland, Kai; Rothschild, Brian J.; Sundby, Svein; Drinkwater, Ken; Brander, Keith; Ottersen, Geir; Carscadden, James E.; Stenson, Garry B.; Chouinard, Ghislain A.; Swain, Douglas P.; Daan, N.; Enberg, Katja; Hammill, Michael O.; Rosing-Asvid, Aqqalu; Svedäng, Henrik; Vázquez, Antonio (Chapter, 2008)
      Many stocks of Atlantic cod (Gadus morhua) on both sides of the North Atlantic are currently at much reduced levels of biomass, but this situation is not in all instances the result of long, continuous decline. Most Northwest ...

    • Decline and Recovery of Atlantic Cod (Gadus morhua) Stocks throughout the North Atlantic 

      Lilly, George R.; Wieland, Kai; Rothschild, Brian J.; Sundby, Svein; Drinkwater, Ken; Brander, Keith; Ottersen, Geir; Carscadden, James E.; Stenson, Garry B.; Chouinard, Ghislain A.; Swain, Douglas P.; Daan, N.; Enberg, Katja; Hammill, Michael O.; Rosing-Asvid, Aqqalu; Svedäng, Henrik; Vázquez, Antonio (Chapter, 2008)
      Many stocks of Atlantic cod (Gadus morhua) on both sides of the North Atlantic are currently at much reduced levels of biomass, but this situation is not in all instances the result of long, continuous decline. Most Northwest ...

    • Density‐ and size‐dependent mortality in fish early life stages 

      Stige, Leif Christian; Rogers, Lauren; Neuheimer, Anna B.; Hunsicker, Mary E.; Yaragina, Natalia A.; Ottersen, Geir; Ciannelli, Lorenzo; Langangen, Øystein; Durant, Joel Marcel (Journal article; Peer reviewed, 2019)
      The importance of survival and growth variations early in life for population dynamics depends on the degrees of compensatory density dependence and size dependence in survival at later life stages. Quantifying density‐ ...

    • 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 ...