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Browsing Brage IMR by Author "Knutsen, Tor"

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    • Acoustic backscatter from zooplankton and fish explored through an optimized model framework 

      Lebourges-Dhaussy, A.; Knutsen, Tor; Korneliussen, Rolf J. (ICES CM Documents;2004/R:39, Working paper, 2004)
      The purpose of this work has been to test complementary methods in order to classify marine organisms, with particularly attention to zooplankton and fish. Algorithms to separate fish and zooplankton have been developed ...
    • Acoustic manual for the krill synoptic survey in 2019 

      macaulay, gavin; Skaret, Georg; Knutsen, Tor; Bergstad, Odd Aksel; Krafft, Bjørn Arne (CCAMLR;WG-EMM-18/12, Research report, 2018)
      The previously presented document at the 2018 ASAM WG meeting (ASAM-18-07) described a design and plans for a synoptic krill acoustic survey in CCAMLR area 48 in 2019. The survey involves the collaborative efforts of Norway, ...
    • Acoustic visualization of large scale macroplankton and micronekton distributions across the Norwegian shelf and slope of the Norwegian Sea. 

      Melle, Webjørn; Kaartvedt, Stein; Knutsen, Tor; Dalpadado, Padmini; Skjoldal, Hein Rune (ICES CM Documents;1993/L:44, Working paper, 1993)
      We present results from acoustical (38 kHz split beam) surveys, biological sampling (trawling, zooplankton nets), and measurements of physical parameters (salinity, temperature, currents) across and along the shelf ...
    • An Antarctic krill (Euphausia superba) hotspot - population characteristics, abundance and vertical structure explored from a krill fishing vessel 

      Krafft, Bjørn Arne; Skaret, Georg; Knutsen, Tor (Conference object, 2016)
    • An Antarctic krill (Euphausia superba) hotspot: population characteristics, abundance and vertical structure explored from a krill fishing vessel 

      Krafft, Bjørn Arne; Skaret, Georg; Knutsen, Tor (Journal article; Peer reviewed, 2015-06-17)
    • Antarctic krill swarm characteristics in the Southeast Atlantic sector of the Southern Ocean 

      Krafft, Bjørn A.; Skaret, Georg; Knutsen, Tor; Melle, Webjørn; Klevjer, Thor A.; Søiland, Henrik (Journal article; Peer reviewed, 2012-09-28)
      Knowledge about swarm dynamics and underlying causes is essential to understand the ecology and distribution of Antarctic krill Euphausia superba. We collected acoustic data and key environmental data continuously across ...
    • Broadband echo spectra from euphausiids and copepods 

      Foote, Kenneth G.; Knutsen, Tor; Atkins, Philip R.; Bongiovanni, Claire; Francis, David T. I.; Eriksen, Peter K.; Larsen, Mette Torp; Mortensen, Tom (Others, 2000)
    • Climate variations and the state of zooplankton in the Barents Sea 

      Orlova, Emma L.; Guzenko, V.; Dalpadado, Padmini; Knutsen, Tor; Nesterova, V.N.; Yurko, O. (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007)
      We present data on zooplankton biomass distribution in August-September 2005-2006 obtained in the integrated ecosystem system survey for the Barents Sea performed by Russian and Norwegian vessels. In order to establish ...
    • Climate variations and the state of zooplankton in the Barents Sea 

      Orlova, Emma L.; Guzenko, V.; Dalpadado, Padmini; Knutsen, Tor; Nesterova, V.N.; Yurko, O. (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007)
      We present data on zooplankton biomass distribution in August-September 2005-2006 obtained in the integrated ecosystem system survey for the Barents Sea performed by Russian and Norwegian vessels. In order to establish ...
    • Climatic variations and the state of zooplankton in the barents sea [presentation] 

      Orlova, Emma L.; Guzenko, V.; Dalpadado, Padmini; Knutsen, Tor; Nesterova, V.N.; Yurko, O. (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007)
    • Climatic variations and the state of zooplankton in the barents sea [presentation] 

      Orlova, Emma L.; Guzenko, V.; Dalpadado, Padmini; Knutsen, Tor; Nesterova, V.N.; Yurko, O. (IMR/PINRO Joint Report Series;5/2007, Conference object, 2007)
    • Coincident mass occurrence of gelatinous zooplankton in Northern Norway 

      Knutsen, Tor; Hosia, Aino; Falkenhaug, Tone; Skern-Mauritzen, Rasmus; Wiebe, Peter H.; Larsen, Roger B.; Aglen, Asgeir; Berg, Erik (Peer reviewed; Journal article, 2018)
      In autumn 2015, several sources reported observations of large amounts of gelatinous material in a large north Norwegian fjord system, either caught when trawling for other organisms or fouling fishing gear. The responsible ...
    • Detection and counting of individual free-swimming krill using a 2MHz scanning sonar 

      Ona, Egil; Knutsen, Tor (ICES CM Documents;1992/L:18, Working paper, 1992)
      The euphausiid crustacean Meganyctiphanes norvegica (M. Sars) have been detected and counted in the scanning section of a 2 MHz scanning sonar beam up to 3 meters from the sonar head. The tests completes a pilot investigation ...
    • Distribution and composition of mesopelagic macroplankton and micronekton in the North-east Atlantic 

      Garcia-Seoane, E.; Klevjer, Thor A.; Knutsen, Tor; Macaulay, Gavin; Mork, Kjell Arne; Rosen, Shale; Strand, Espen; Wienerroither, Rupert; Underwood, Melanie; Melle, Webjørn Raunsgård (Lecture, 2018)
    • Ecology of mesozooplankton across four North Atlantic basins 

      Strand, Espen; Klevjer, Thor A.; Melle, Webjørn Raunsgård; Knutsen, Tor (Peer reviewed; Journal article, 2020)
      A comparative study of the mesozooplankton in four North Atlantic basins is presented. During a trans-Atlantic expedition with R/V G.O. Sars in May and June 2013, the Norwegian Sea, Iceland Sea, Irminger Sea and Labrador ...
    • Ecosystem approach to Barents Sea Ecology : spatial and trophic relationships 

      Jørgensen, Lis Lindal; Olsen, Erik; Gjøsæter, Harald; Knutsen, Tor; Lønne, Ole Jørgen; Loeng, Harald; Primicerio, Raul (Conference object, 2007-01-22)
    • Evidence of diel vertical migration of mesopelagic sound-scattering organisms in the Arctic 

      Gjøsæter, Harald; Wiebe, Peter H.; Knutsen, Tor; Ingvaldsen, Randi Brunvær (Peer reviewed; Journal article, 2017)
    • Experiences in making acoustic measurements in a mesocosm with Calanus finmarchius 

      Knutsen, Tor; Foote, Kenneth G. (ICES CM Documents;1997/FF:11, Working paper, 1997)
      In connection with a larger study of the effects of nutrification and turbulence on primary and secondary production, acoustic measurements have been made in the water volume defined by floating, vertically oriented, ...
    • Harp seal body condition and trophic interactions with prey in Norwegian high Arctic waters in early autumn 

      Haug, Tore; Biuw, Martin; Gjøsæter, Harald; Knutsen, Tor; Lindstrøm, Ulf; MacKanzie, Kirsteen M.; Meier, Sonnich; Nilssen, Kjell Tormod (Peer reviewed; Journal article, 2020)
      In September 2016, a marine ecosystem survey covered all trophic levels from phytoplankton to seals in the Arctic Ocean to the west and north of Svalbard. At the ice edge, 26 harp seals were sampled to assess whether recent ...
    • Håndbok for prøvetaking og pre-analyse av plankton 

      Hassel, Arne; Endresen, Berit; Martinussen, Monica; Knutsen, Tor; Johannessen, Magnus E. (Others, 2013-03)
      Prosedyrer for prøvetaking og pre-analyse av dyre- og planteplankton på forskningsfartøy og i laboratorium på land

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