Blar i Brage IMR på forfatter "Klevjer, Thor A."
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An acoustic method to observe the distribution and behaviour of mesopelagic organisms in front of a trawl
Underwood, Melanie; García-Seoane, Eva; Klevjer, Thor A.; Macaulay, Gavin; Melle, Webjørn Raunsgård (Peer reviewed; Journal article, 2020) -
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 ... -
Behavior of individual mesopelagic fish in acoustic scattering layers of Norwegian fjords
Kaartvedt, Stein; Torgersen, Thomas; Klevjer, Thor A.; Røstad, Anders; Devine, Jennifer A. (Journal article; Peer reviewed, 2008-05-22)Mesopelagic acoustic scattering layers (SLs) in 2 fjords were studied from a stationary research vessel. Diel vertical movements of SLs were assessed by hull-mounted transducers, while in situ behavior of individuals ... -
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) -
Distribution of Antarctic krill and apex predators at South Orkney Islands in 2014, and assessing escape mortality of krill in trawls
Krafft, Bjørn A.; Krag, Ludvig A.; Klevjer, Thor A.; Skaret, Georg; Pedersen, Ronald (Rapport fra Havforskningen;Nr. 10-2014, Working paper, 2014) -
Dynamics of phytoplankton species composition, biomass and nutrients in the North Atlantic during spring and summer - A trans-Atlantic study
Naustvoll, Lars Johan; Melle, Webjørn Raunsgård; Klevjer, Thor A.; Drinkwater, Kenneth F.; Strand, Espen; Knutsen, Tor (Peer reviewed; Journal article, 2020)During a return trip in May–June 2013 from Bergen, Norway, to Nuuk, Greenland, on the Institute of Marine Research's R/V “G. O. Sars”, four ocean basins, the Norwegian, Iceland, Irminger and Labrador seas, were surveyed ... -
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 ... -
Evidence for light-controlled migration amplitude of a sound scattering layer in the Norwegian Sea
Norheim, Eirik; Klevjer, Thor A.; Aksnes, Dag Lorents (Journal article; Peer reviewed, 2016-06-09)The oceanic sound scattering layer (SL) is an ubiquitous acoustic signature of mesopelagic fishes and invertebrates that are important food sources for the oceanic macrofauna and players in the biological carbon pump. We ... -
Fine-scale observations of physical and biological environment along a herring feeding migration route
Melle, Webjørn Raunsgård; Klevjer, Thor A.; Strand, Espen; Wiebe, Peter H.; Slotte, Aril; Huse, Geir (Peer reviewed; Journal article, 2020)We observed herring horizontal and vertical distribution during feeding migration along a 128 km transect across the Arctic front of the Norwegian and Iceland seas, in early June, in relation to its physical, chemical and ... -
Large scale patterns in vertical distribution and behaviour of mesopelagic scattering layers
Klevjer, Thor A.; Irigoien, Xabier; Røstad, Anders; Fraile-Nuez, Eugenio; Benítez-Barrios, Verónica María; Kaartvedt, Stein (Journal article; Peer reviewed, 2016-01-27)Recent studies suggest that previous estimates of mesopelagic biomasses are severely biased, with the new, higher estimates underlining the need to unveil behaviourally mediated coupling between shallow and deep ocean ... -
Micronekton biomass distribution, improved estimates across four north Atlantic basins
Klevjer, Thor A.; Melle, Webjørn Raunsgård; Knutsen, Tor; Strand, Espen; Korneliussen, Rolf; Dupont, Nicolas; Salvanes, Anne Gro Vea; Wiebe, Peter H. (Peer reviewed; Journal article, 2019)Distribution of micronekton was investigated during early summer of 2013, using data from a cruise covering the central parts of four north Atlantic basins, the Norwegian Sea (NS), Iceland Sea (ICS), Irminger Sea (IRS), ... -
Piscivorous fish patrol krill swarms
Kaartvedt, Stein; Røstad, Anders; Fiksen, Øyvind; Melle, Webjørn; Torgersen, Thomas; Breien, M. T.; Klevjer, Thor A. (Journal article; Peer reviewed, 2005-09-01)Dense swarms of the krill Meganyctiphanes norvegica in the Norwegian Sea were patrolled by large, piscivorous fish, which apparently use the krill swarms as feeding grounds in their hunt for planktivores. For the krill, ... -
Spatial distributions and seasonality of four Calanus species in the Northeast Atlantic
Strand, Espen; Bagøien, Espen; Edwards, Martin; Broms, Cecilie; Klevjer, Thor A. (Peer reviewed; Journal article, 2020)This paper analyses spatial and seasonal patterns for near-surface abundances of four Calanus species in the Northeast Atlantic based on monthly Continuous Plankton Recorder (CPR) Survey data collected during 2008–2016. ... -
Structure and functioning of four North Atlantic ecosystems - A comparative study
Melle, Webjørn Raunsgård; Klevjer, Thor A.; Drinkwater, Kenneth F.; Strand, Espen; Naustvoll, Lars Johan; Wiebe, Peter H.; Aksnes, Dag Lorents; Knutsen, Tor; Sundby, Svein; Slotte, Aril; Dupont, Nicolas; Salvanes, Anne Gro Vea; Korneliussen, Rolf; Huse, Geir (Peer reviewed; Journal article, 2020)The epi- and mesopelagic ecosystems of four sub-polar ocean basins, the Labrador, Irminger, Iceland and Norwegian seas, were surveyed during two legs from Bergen, Norway, to Nuuk, Greenland, and back to Bergen. The survey ... -
Vertical distribution and migration of mesopelagic scatterers in four north Atlantic basins
Klevjer, Thor A.; Melle, Webjørn Raunsgård; Knutsen, Tor; Aksnes, Dag Lorents (Peer reviewed; Journal article, 2020)We studied vertical distribution and diel vertical migration (DVM) behaviour of mesopelagic acoustic scattering layers in relation to environmental conditions in the Norwegian Sea, the Iceland Sea, the Irminger Sea, and ...