Blar i Brage IMR på forfatter "Aksnes, Dag Lorents"
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Caught in broad daylight: Topographic constraints of zooplankton depth distributions
Aarflot, Johanna Myrseth; Aksnes, Dag Lorents; Opdal, Anders Frugård; Skjoldal, Hein Rune; Fiksen, Øyvind (Journal article; Peer reviewed, 2018)For visual predators, sufficient light is critical for prey detection and capture. Because light decays exponentially with depth in aquatic systems, vertical movement has become a widespread strategy among zooplankton for ... -
Coastal water darkening and implications for mesopelagic regime shifts in Norwegian fjords
Aksnes, Dag Lorents; Dupont, Nicolas; Staby, Arved; Fiksen, Øyvind; Kaartvedt, Stein; Aure, Jan (Journal article; Peer reviewed, 2009-07-28)The light regime of the water column has a strong structuring effect on aquatic food webs and it has been previously hypothesized that coastal water darkening has increased the success of tactile predators relative to ... -
Complete acoustic recording of water column scatters and sea bed characteristics.
Knudsen, Hans Petter; Melle, Webjørn; Misund, Ole Arve; Ona, Egil; Aksnes, Dag Lorents; Seirup, Hans Petter (The Journal of the Acoustical Society of America, Others, 2001) -
Ecosystem model for evaluating potential cod production in a west Norwegian fjord
Salvanes, Anne Gro Vea; Aksnes, Dag Lorents; Giske, Jarl (Journal article; Peer reviewed, 1992-12-08)The carrying capacity for cod in a Norwegian fjord was analysed by means of a simulation model. Four age groups of cod were represented as well as the main prey groups labrids, gobies and benthic organisms. These groups ... -
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 ... -
Feeding ecology of Benthosema glaciale across the North Atlantic
Knutsen, Tor; Strand, Espen; Klevjer, Thor A.; Salvanes, Anne Gro Vea; Broms, Cecilie; Sunde, Synne Myhre; Aksnes, Dag Lorents; García-Seoane, Eva; Melle, Webjørn Raunsgård (Peer reviewed; Journal article, 2023)The glacier lanternfish Benthosema glaciale is a key myctophid with a wide distribution in the northern Atlantic. It is a species that has a strong vertical migration capacity and have the potential to move between the ... -
Flexible behaviour in a mesopelagic fish (Maurolicus muelleri)
Klevjer, Thor Aleksander; Røstad, Anders; Aksnes, Dag Lorents; Kaartvedt, Stein (Peer reviewed; Journal article, 2021)Variability of mesopelagic scattering layers is often attributed to environmental conditions or multi-species layer composition. Yet, little is known about variation in behaviour among the individuals forming scattering ... -
Flexible behaviour in a mesopelagic fish (Maurolicus muelleri)
Christiansen, Svenja; Klevjer, Thor Aleksander; Røstad, Anders; Aksnes, Dag Lorents; Kaartvedt, Stein (Peer reviewed; Journal article, 2021)Variability of mesopelagic scattering layers is often attributed to environmental conditions or multi-species layer composition. Yet, little is known about variation in behaviour among the individuals forming scattering ... -
Modellering av fordeling, vekst og overlevelse av fisk i Barentshavet
Giske, Jarl; Skjoldal, Hein Rune; Aksnes, Dag Lorents (Fisken og havet, Research report, 1992)Ved hjelp av modeller for strøm, temperatur, plankton og fisk i Barentshavet skal fiskenes fordeling, vekst og overlevelse beregnes fra biologiske (evolusjonære, økologiske) og fysiske drivkrefter. Målet er å utvikle ... -
Multi-decadal warming of Atlantic water and associated decline of dissolved oxygen in a deep fjord
Aksnes, Dag Lorents; Aure, Jan; Johansen, Per-Otto; Johnsen, Geir Helge; Salvanes, Anne Gro Vea (Journal article; Peer reviewed, 2019)Previous studies have shown decline in dissolved oxygen of the ocean basins. A hypothesis for this development is that ocean warming through increased stratification has caused reduced ventilation of the interior ocean. ... -
Plankton succession and responses to manipulations in a marine basin for larval fish rearing
Naas, Kjell Emil; van der Meeren, Terje; Aksnes, Dag Lorents (Journal article; Peer reviewed, 1991-08-08)A marine basin was constructed in order to provide fish larvae a natural environment for growth and survival. In nature, similar enclosed systems are limited by stagnant water and anoxic conditions. Consequently, 3 types ... -
Significance of advection for the carrying capacities of fjord populations
Aksnes, Dag Lorents; Aure, Jan; Kaartvedt, Stein; Magnesen, Thorolf; Richard, J. (Journal article; Peer reviewed, 1989-02-02)Advective rates of nutrients, phytoplankton and zooplankton were estimated for the Masfjord, western Norway, in June and October 1985. The advective contribution to the phytoplankton biomass formation was dearly less ... -
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 ...