Browsing Brage IMR by Author "Kristiansen, Trond"

Now showing items 1-20 of 22

    • Applying a New Ensemble Approach to Estimating Stock Status of Marine Fisheries around the World 

      Rosenberg, Andrew; Kleisner, Kristin M; Afflerbach, Jamie; Anderson, Sean C.; Dickey-Collas, Mark; Cooper, Andrew B.; Fogarty, Michael J.; Fulton, Elizabeth A.; Gutierrez, Nicolas L.; Hyde, Kimberly J.W.; Jardim, Ernesto; Jensen, Olaf P.; Kristiansen, Trond; Longo, Catherine; Minte-Vera, Carolina V.; Minto, Coilin; Mosqueira, Iago; Osio, Giacomo Chato; Ovando, Daniel; Selig, Elizabeth R; Thorson, James T.; Walsh, Jessica C.; Ye, Yimin (Journal article; Peer reviewed, 2018)
      The exploitation status of marine fisheries stocks worldwide is of critical importance for food security, ecosystem conservation, and fishery sustainability. Applying a suite of data‐limited methods to global catch data, ...

    • Carbon export is facilitated by sea urchins transforming kelp detritus 

      Filbee-Dexter, Karen; Pedersen, Morten Foldager; Fredriksen, Stein; Norderhaug, Kjell Magnus; Rinde, Eli; Kristiansen, Trond; Albretsen, Jon; Wernberg, Thomas (Peer reviewed; Journal article, 2019)
      With the increasing imperative for societies to act to curb climate change by increasing carbon stores and sinks, it has become critical to understand how organic carbon is produced, released, transformed, transported, and ...

    • Declining size-at-harvest in Norwegian salmon aquaculture: Lice, disease, and the role of stunboats 

      Barrett, LukeT.; Oldham, Tina Marie Wier; Kristiansen, Trond; Oppedal, Frode; Stien, Lars Helge (Peer reviewed; Journal article, 2022)
      Sea cages used for fish farming are typically open to the environment, making the grow-out phase a race against the accumulation of infections. In Norway, farmed Atlantic salmon (Salmo salar) suffer outbreaks of salmon ...

    • Drift, growth, and survival of larval Northeast Arctic cod with simple rules of behaviour 

      Vikebø, Frode; Jørgensen, Christian; Kristiansen, Trond; Fiksen, Øyvind (Journal article; Peer reviewed, 2007-10-11)
      Due to vertical variations in ocean circulation, larval Northeast Arctic cod Gadus morhua may influence their own drift routes by migrating vertically. By coupling a larval individual-based model and a general circulation ...

    • Dynamic Mapping of North Sea Spawning – Report of the KINO Project 

      Sundby, Svein; Kristiansen, Trond; Nash, Richard; Johannessen, Tore (Fisken og havet;2-2017, Research report, 2017-02-17)
      Spawning areas and spawning periods of 34 North Sea fish species have been studied by combining data, models and literature. Major part of data is from eggs and larvae surveys. In addition, data from research vessels and ...

    • Individual-based modeling of feeding ecology and prey selection of larval cod on Georges Bank 

      Kristiansen, Trond; Lough, R. G.; Werner, Francisco E.; Broughton, Elisabeth A.; Buckley, Larry J. (Journal article; Peer reviewed, 2009-02-11)
      Understanding larval fish survival dynamics is essential to determining variability in future adult population structure. Realistic modeling of larval fish feeding ecology depends on incorporating both the biotic and abiotic ...

    • Klimapåvirkning på viktige kystvannsarter 

      Kristiansen, Trond; Kvile, Kristina Øie; Aune, Magnus; Jensen, Jenny; Bellerby, Richard; Skjellum, Solrun Figenschau; Hairabedian, Gabrielle (NIVA-rapport, Research report, 2022)
      Vi beskriver statistisk nedskalering av det marine fysisk-biologiske klimaet for norskekysten under tre klimagassutslippscenarioer (SSP1-2.6, SSP2-4.5, SSP5-8.5). Resultatene inngår i beregningene for fremtidig habitatskvalitet ...

    • Klimapåvirkning på viktige kystvannsarter 

      Kristiansen, Trond; Kvile, Kristina Øie; Aune, Magnus; Jensen, Jenny; Bellerby, Richard; Skjellum, Solrun Figenschau; Hairabedian, Gabrielle (NIVA-rapport, Research report, 2022)
      Vi beskriver statistisk nedskalering av det marine fysisk-biologiske klimaet for norskekysten under tre klimagassutslippscenarioer (SSP1-2.6, SSP2-4.5, SSP5-8.5). Resultatene inngår i beregningene for fremtidig habitatskvalitet ...

    • KunnskapsInnhenting Barentshavet–Lofoten–Vesterålen (KILO) 

      Sundby, Svein; Fossum, Petter; Sandvik, Anne Dagrun; Vikebø, Frode; Aglen, Asgeir; Buhl-Mortensen, Lene; Folkvord, Arild; Bakkeplass, Kjell; Buhl-Mortensen, Pål; Johannessen, Magnus; Jørgensen, Martin S.; Kristiansen, Trond; Landra, Camilla S.; Myksvoll, Mari Skuggedal; Nash, Richard D.M. (Fisken og Havet;3-2013, Research report, 2013-03)
      I revidert nasjonalbudsjett 2011 fikk Havforskningsinstituttet i oppdrag å styrke kunnskapsgrunnlaget om marine økosystemer og ressurser i området Lofoten-Vesterålen. Prosjektet ble gjennomført i perioden fra november 2011 ...

    • Linking behavioural ecology and oceanography: larval behaviour determines growth, mortality and dispersal 

      Fiksen, Øyvind; Jørgensen, Christian; Kristiansen, Trond; Vikebø, Frode; Huse, Geir (Journal article; Peer reviewed, 2007-10-11)
      Highly resolved general circulation models (GCMs) now generate realistic flow fields, and have revealed how sensitive larval drift routes are to vertical positioning in the water column. Sensible representation of behavioural ...

    • Modelling rule-based behaviour: habitat selection and the growth–survival trade-off in larval cod 

      Kristiansen, Trond; Jørgensen, Christian; Lough, R. G.; Vikebø, Frode; Fiksen, Øyvind (ICES CM documents;2009/T:03, Working paper, 2009)

    • Modelling the sources of mortality for larval haddock on Georges Bank and their effects on behavior 

      Petrik, Colleen M.; Davis, Cabell S.; Ji, Rubao; Lough, R. G.; Kristiansen, Trond (ICES CM documents;2009/T:08, Working paper, 2009)
      Fish larvae have the ability to change their vertical position in the water column and thusly cannot be treated as passive particles in coupled biological-physical individualbased models (IBMs). The vertical variability ...

    • Possible future scenarios for two major Arctic Gateways connecting Subarctic and Arctic marine systems: I. Climate and physical-chemical oceanography 

      Drinkwater, Kenneth F.; Harada, Naomi; Nishino, Shigeto; Chierici, Melissa; Danielson, Seth L.; Ingvaldsen, Randi Brunvær; Kristiansen, Trond; Hunt, George L.; Mueter, Franz; Stiansen, Jan Erik (Peer reviewed; Journal article, 2021)
      We review recent trends and projected future physical and chemical changes under climate change in transition zones between Arctic and Subarctic regions with a focus on the two major inflow gateways to the Arctic, one in ...

    • Potential effects of reduced riverine inorganic particle loading on water quality in the Oslofjord region 

      Wallhead, Philip; Kristiansen, Trond; Frigstad, Helene; Sørensen, Kai; Marty, Sabine (NIVA-rapport, Research report, 2021)
      A model investigation was carried out of the potential impacts of reduced riverine inorganic particle loading in the Oslofjord region. Some significant improvements in water clarity, particularly in the Glomma estuary, ...

    • Prey selection by larval haddock and cod on copepods with species-specific behavior: an individual-based model analysis 

      Petrik, Colleen M.; Kristiansen, Trond; Lough, R. G.; Davis, Cabell S. (Journal article; Peer reviewed, 2009-12-09)
      Coupled biological-physical models of larval fish have become a widely used tool for studying recruitment variability. Within these models, foraging components include prey selection as a determinant of food availability ...

    • Real-Time Ichthyoplankton Drift in Northeast Arctic Cod and Norwegian Spring-Spawning Herring 

      Vikebø, Frode; Ådlandsvik, Bjørn; Albretsen, Jon; Sundby, Svein; Stenevik, Erling Kåre; Huse, Geir; Svendsen, Einar; Kristiansen, Trond; Eriksen, Elena (Journal article; Peer reviewed, 2011-11-16)
      Background: Individual-based biophysical larval models, initialized and parameterized by observations, enable numerical investigations of various factors regulating survival of young fish until they recruit into the adult ...

    • Recruitment Variability in North Atlantic Cod and Match-Mismatch Dynamics 

      Kristiansen, Trond; Drinkwater, Ken; Lough, R. G.; Sundby, Svein (Journal article; Peer reviewed, 2011-03-07)
      Background Fisheries exploitation, habitat destruction, and climate are important drivers of variability in recruitment success. Understanding variability in recruitment can reveal mechanisms behind widespread decline in ...

    • Release of artificially reared 0-group coastal cod (Gadus morhua L.) in a landlocked fjord in western Norway 

      Svåsand, Terje; Kristiansen, Trond (ICES CM Documents;1985/F:10, Working paper, 1985)
      In 1983 and 1984 about 14 000 seven month old pond or basin reared coastal cod were tagged and released in Heimarkspollen and Osen in Western Norway. In May 1984 fishing in the release areas was initiated and local ...

    • Seasonal phytoplankton blooms in the North Atlantic linked to the overwintering strategies of copepods 

      Friedland, Kevin D; Record, Nicholas R; Asch, Rebecca G; Kristiansen, Trond; Saba, Vincent S; Drinkwater, Kennneth F.; Henson, Stephanie; Leaf, Robert T; Morse, Ryan E; Johns, David G; Large, Scott I; Hjøllo, Solfrid Sætre; Nye, Janet A; Alexander, Mike A; Ji, Rubao (Journal article; Peer reviewed, 2016)
      The North Atlantic Ocean contains diverse patterns of seasonal phytoplankton blooms with distinct internal dynamics. We analyzed blooms using remotely-sensed chlorophyll a concentration data and change point statistics. ...

    • Spatial Match-Mismatch between Juvenile Fish and Prey Provides a Mechanism for Recruitment Variability across Contrasting Climate Conditions in the Eastern Bering Sea 

      Siddon, Elizabeth Calvert; Kristiansen, Trond; Mueter, Franz J.; Holsman, Kristin K.; Heintz, Ron A.; Farley, Edward V. (Journal article; Peer reviewed, 2013-12-31)
      Understanding mechanisms behind variability in early life survival of marine fishes through modeling efforts can improve predictive capabilities for recruitment success under changing climate conditions. Walleye pollock ...