Stein Kaartvedt

• Langbehn, Tom; Aksnes, Dag Lorents; Kaartvedt, Stein; Fiksen, Øyvind & Jørgensen, Christian (2019). Light comfort zone in a mesopelagic fish emerges from adaptive behaviour along a latitudinal gradient. Marine Ecology Progress Series.  ISSN 0171-8630.  623, s 161- 174 . doi: 10.3354/meps13024
• Calleja, Maria Ll; Ansari, Mohd I; Røstad, Anders; Silva, Luis; Kaartvedt, Stein; Irigoien, Xabier & Moran, Xose Anxelu G (2018). The mesopelagic scattering layer: A hotspot for heterotrophic prokaryotes in the Red Sea twilight zone. Frontiers in Marine Science.  ISSN 2296-7745.  5, s 1- 9 . doi: 10.3389/fmars.2018.00259 Full text in Research Archive.
• Hozumi, Aya; Hong, Pei-Ying; Kaartvedt, Stein; Røstad, Anders & Jones, Burton H. (2018). Water quality, seasonality, and trajectory of an aquaculture-wastewater plume in the Red Sea. Aquaculture Environment Interactions.  ISSN 1869-215X.  10, s 61- 77 . doi: 10.3354/AEI00254
• Hozumi, Aya; Kaartvedt, Stein; Røstad, Anders; Berumen, Michael L; Cochran, Jesse E.M. & Jones, Burton H. (2018). Acoustic backscatter at a Red Sea whale shark aggregation site. Regional Studies in Marine Science.  ISSN 2352-4855.  20, s 23- 33 . doi: 10.1016/j.rsma.2018.03.008
• Aksnes, Dag Lorents; Røstad, Anders; Kaartvedt, Stein; Martinez, Udane; Duarte, Carlos M. & Irigoien, Xabier (2017). Light penetration structures the deep acoustic scattering layers in the global ocean. Science Advances.  ISSN 2375-2548.  3(5) . doi: 10.1126/sciadv.1602468 Full text in Research Archive.
• Bozman, Andrea; Titelman, Josefin; Kaartvedt, Stein; Eiane, Ketil & Aksnes, Dag Lorents (2017). Jellyfish distribute vertically according to irradiance. Journal of Plankton Research.  ISSN 0142-7873.  39(2), s 280- 289 . doi: 10.1093/plankt/fbw097 Full text in Research Archive.
• Busserolles de, Fanny; Cortesi, Fabio; Helvik, Jon Vidar; Davies, Wayne I. L.; Templin, Rachel M.; Sullivan, Robert K. P.; Michell, Craig T.; Mountford, Jessica K.; Collin, Shaun P.; Irigoien, Xabier; Kaartvedt, Stein & Marshall, Justin (2017). Pushing the limits of photoreception in twilight conditions: The rod-like cone retina of the deep-sea pearlsides. Science Advances.  ISSN 2375-2548.  3(11), s 1- 13 . doi: 10.1126/sciadv.aao4709 Full text in Research Archive.
• Kaartvedt, Stein; Røstad, Anders & Aksnes, Dag Lorents (2017). Changing weather causes behavioral responses in the lower mesopelagic. Marine Ecology Progress Series.  ISSN 0171-8630.  574, s 259- 263 . doi: 10.3354/meps12185
• Solberg, Ingrid & Kaartvedt, Stein (2017). The diel vertical migration patterns and individual swimming behavior of overwintering sprat Sprattus sprattus. Progress in Oceanography.  ISSN 0079-6611.  151, s 49- 61 . doi: 10.1016/j.pocean.2016.11.003 Show summary

  Sprat DVM Dusk and dawn Hypoxia Diving behavior Nocturnal behavior Swimming speed

• Ariza, A; Landeira, J.M.; Escanez, A.; Wienerroither, Rupert; Aguilar de Soto, N.; Røstad, Anders; Kaartvedt, Stein & Hernández-León, Santiago (2016). Vertical distribution, composition and migratory patterns of acoustic scattering layers in the Canary Islands. Journal of Marine Systems.  ISSN 0924-7963.  157, s 82- 91 . doi: 10.1016/j.jmarsys.2016.01.004
• Banguera-Hinestroza, E; Eikrem, W; Mansour, H; Solberg, I; Cúrdia, J; Holtermann, K; Edvardsen, B & Kaartvedt, S (2016). Seasonality and toxin production of Pyrodinium bahamense in a Red Sea lagoon. Harmful Algae.  ISSN 1568-9883.  55, s 163- 171 . doi: 10.1016/j.hal.2016.03.002
• Folkvord, Arild; Gundersen, Geir; Albretsen, Jon; Asplin, Lars; Kaartvedt, Stein & Giske, Jarl (2016). Impact of hatch date on early life growth and survival of Mueller’s pearlside (Maurolicus muelleri) larvae and life-history consequences. Canadian Journal of Fisheries and Aquatic Sciences.  ISSN 0706-652X.  73, s 163- 176 . doi: 10.1139/cjfas-2015-0040
• Folkvord, Arild; Gundersen, Geir; Albretsen, Jon; Asplin, Lars; Kaartvedt, Stein & Giske, Jarl (2016). Impact of hatch-date on early life growth and survival of Mueller's pearlside (Maurolicus Muelleri) larvae and life-history consequences. Canadian Journal of Fisheries and Aquatic Sciences.  ISSN 0706-652X.  73(2), s 163- 176 . doi: 10.1139/cjfas-2015-0040 Full text in Research Archive.
• Kaartvedt, Stein; Antunes, andré; Røstad, Anders; Klevjer, Thor A. & Vestheim, Hege Finsås (2016). Zooplankton at deep Red Sea brine pools. Journal of Plankton Research.  ISSN 0142-7873.  38(3), s 679- 684 . doi: 10.1093/plankt/fbw013
• Klevjer, Thor A.; Irigoien, Xabier; Røstad, Anders; Fraile-Nuez, Eugenio; Benítez-Barrios, Verónica María & Kaartvedt, Stein (2016). Large scale patterns in vertical distribution and behaviour of mesopelagic scattering layers. Scientific Reports.  ISSN 2045-2322.  6 . doi: 10.1038/srep19873 Full text in Research Archive.
• Prihartato, Perdana K.; Irigoien, Xabier; Genton, Marc G. & Kaartvedt, Stein (2016). Global effects of moon phase on nocturnal acoustic scattering layers. Marine Ecology Progress Series.  ISSN 0171-8630.  544, s 65- 75 . doi: 10.3354/meps11612
• Røstad, Anders; Kaartvedt, Stein & Aksnes, Dag Lorents (2016). Light comfort zones of mesopelagic acoustic scattering layers in two contrasting optical environments. Deep Sea Research Part I: Oceanographic Research Papers.  ISSN 0967-0637.  113, s 1- 6 . doi: 10.1016/j.dsr.2016.02.020 Full text in Research Archive.
• Seibel, Brad A.; Schneider, Jillian L.; Kaartvedt, Stein; Wishner, Karen F. & Daly, Kendra L. (2016). Hypoxia tolerance and metabolic suppression in oxygen minimum zone euphausiids: implications for ocean deoxygenation and biogeochemical cycles. Integrative and Comparative Biology.  ISSN 1540-7063.  56(4), s 510- 523 . doi: 10.1093/icb/icw091
• Wiebe, Peter H.; Bucklin, Ann; Kaartvedt, Stein; Røstad, Anders & Blanco-Bercial, Leocadio (2016). Vertical distribution and migration of euphausiid species in the Red Sea. Journal of Plankton Research.  ISSN 0142-7873.  38(4), s 888- 903 . doi: 10.1093/plankt/fbw038
• Calbet, Albert; Agersted, Mette Dalgaard; Kaartvedt, Stein; Møhl, Malene; Møller, Eva Friis; Enghoff-Poulsen, Søren; Paulsen, Maria Lund; Solberg, Ingrid; Tang, Kam W.; Tönnesson, Kajsa; Raitsos, Dionysios E. & Nielsen, Torkel Gissel (2015). Heterogeneous distribution of plankton within the mixed layer and its implications for bloom formation in tropical seas. Scientific Reports.  ISSN 2045-2322.  5, s 1- 14 . doi: 10.1038/srep11240 Full text in Research Archive.
• Kaartvedt, Stein; Ugland, Karl Inne; Klevjer, Thor A.; Røstad, Anders; Titelman, Josefin & Solberg, Ingrid (2015). Social behaviour in mesopelagic jellyfish. Scientific Reports.  ISSN 2045-2322.  5, s 1- 8 . doi: 10.1038/srep11310 Full text in Research Archive.
• Prihartato, Perdana K.; Aksnes, Dag Lorents & Kaartvedt, Stein (2015). Seasonal patterns in the nocturnal distributionand behavior of the mesopelagic fish Maurolicus muelleri at high latitudes. Marine Ecology Progress Series.  ISSN 0171-8630.  521, s 189- 200 . doi: 10.3354/meps11139
• Solberg, Ingrid; Røstad, Anders & Kaartvedt, Stein (2015). Ecology of overwintering sprat (Sprattus sprattus). Progress in Oceanography.  ISSN 0079-6611.  138, s 116- 135 . doi: 10.1016/j.pocean.2015.08.003 Full text in Research Archive.
• Vestheim, Hege & Kaartvedt, Stein (2015). A deep sea community at the Kebrit brine pool in the Red Sea. Marine Biodiversity.  ISSN 1867-1616.  s 1- 7 . doi: 10.1007/s12526-015-0321-0
• Vestheim, Hege; Røstad, Anders; Klevjer, Thor A.; Solberg, Ingrid & Kaartvedt, Stein (2014). Vertical distribution and diel vertical migration of krill beneath snow-covered ice and in ice-free waters. Journal of Plankton Research.  ISSN 0142-7873.  36(2), s 503- 512 . doi: 10.1093/plankt/fbt112
• Ariza, A; Kaartvedt, Stein; Røstad, A; Garijo, JC; Aristegui, J; Fraile-Nuez, E & Hernández-León, Santiago (2014). The submarine volcano eruption off El Hierro Island: Effects on the scattering migrant biota and the evolution of the pelagic communities. PLoS ONE.  ISSN 1932-6203. . doi: 10.1371/journal.pone.0102354
• Godø, Olav Rune; Handegard, Nils Olav; Browman, Howard; Macaulay, Gavin; Kaartvedt, Stein; Giske, Jarl; Ona, Egil; Huse, Geir & Johnsen, Espen (2014). Marine ecosystem acoustics (MEA): Quantifying processes in the sea at the spatio-temporal scales on which they occur. ICES Journal of Marine Science.  ISSN 1054-3139.  71(8), s 2357- 2369 . doi: 10.1093/icesjms/fsu116
• Hessen, Dag Olav & Kaartvedt, Stein (2014). Top-down cascades in lakes and oceans: Different perspectives but same story?. Journal of Plankton Research.  ISSN 0142-7873.  36(4), s 914- 924 . doi: 10.1093/plankt/fbu040
• Irigoien, Xabier; Klevjer, Thor A.; Røstad, Anders; Martinez, U; Boyra, G; Acuna, JL; Bode, A; Echevarria, F; Gonzalez-Gordillo, JI; Hernández-León, Santiago; Augsti, S; Aksnes, Dag Lorents; Duarte, CM & Kaartvedt, Stein (2014). Large mesopelagic fishes biomass and trophic efficiency in the open ocean. Nature Communications.  ISSN 2041-1723. . doi: 10.1038/ncomms4271 Full text in Research Archive.
• Kaartvedt, Stein (2014). The Submarine Volcano Eruption off El Hierro Island: Effects on the Scattering Migrant Biota and the Evolution of the Pelagic Communities. PLoS ONE.  ISSN 1932-6203.  9(7)
• Solberg, Ingrid & Kaartvedt, Stein (2014). Surfacing behavior and gas release of the physostome sprat (Sprattus sprattus) in ice-free and ice-covered waters. Marine Biology.  ISSN 0025-3162.  161(2), s 285- 296 . doi: 10.1007/s00227-013-2334-1 Full text in Research Archive.
• Ugland, Karl Inne; Aksnes, Dag Lorents; Klevjer, Thor A.; Titelman, Josefin & Kaartvedt, Stein (2014). Lévy night flights by the jellyfish Periphylla periphylla. Marine Ecology Progress Series.  ISSN 0171-8630.  513, s 121- 130 . doi: 10.3354/meps10942
• Røstad, Anders & Kaartvedt, Stein (2013). Seasonal and diel patterns in sedimentary flux of krill fecal pellets recorded by an echo sounder. Limnology and Oceanography.  ISSN 0024-3590.  58(6), s 1985- 1997 . doi: 10.4319/lo.2013.58.6.1985
• Skjoldal, Hein Rune; Wiebe, Peter; Postel, Lutz; Knutsen, Tor; Kaartvedt, Stein & Sameoto, Douglas D. (2013). Intercomparison of zooplankton (net) sampling systems: Results from the ICES/GLOBEC sea-going workshop. Progress in Oceanography.  ISSN 0079-6611.  108, s 1- 42 . doi: 10.1016/j.pocean.2012.10.006
• Solberg, Ingrid; Kaartvedt, Stein & Klevjer, Thor A. (2013). The use of echosounders for long-term studies of the overwintering ecology of sprat (Sprattus sprattus), In  2013 MTS/IEEE OCEANS - Bergen.  IEEE.  ISBN 978-1-4799-0001-5.  Chapter. Show summary

  Upward-facing echosounders, were used to study the overwintering ecology of sprat during four winters in a Norwegian fjord. The echosounders provided continuous data at a temporal resolution of seconds and enabled studies of individual swimming behavior of sprat in addition to population behavior. The long-term coverage of several winters enabled us to study how the sprat responded to different environmental conditions, like ice-free waters versus ice covered waters and hypoxic conditions versus well-oxygenated waters. The studies unveiled that the overwintering strategies of the sprat are flexible, varying in accordance with environmental conditions.

• Vestheim, Hege Finsås; Brucet, Sandra & Kaartvedt, Stein (2013). Vertical distribution, feeding and vulnerability to tactile predation in Metridia longa (Copepoda, Calanoida). Marine Biology Research.  ISSN 1745-1000.  9(10), s 949- 957 . doi: 10.1080/17451000.2013.793806
• Bagøien, Espen; Melle, Webjørn Raunsgård & Kaartvedt, Stein (2012). Seasonal development of mixed layer depths, nutrients, chlorophyll and Calanus finmarchicus in the Norwegian Sea – A basin-scale habitat comparison. Progress in Oceanography.  ISSN 0079-6611.  103, s 58- 79 . doi: 10.1016/j.pocean.2012.04.014
• Dypvik, Eivind; Klevjer, Thor A. & Kaartvedt, Stein (2012). Inverse vertical migration and feeding in glacier lanternfish (Benthosema glaciale). Marine Biology.  ISSN 0025-3162.  159(2), s 443- 453 . doi: 10.1007/s00227-011-1822-4
• Dypvik, Eivind; Røstad, Anders & Kaartvedt, Stein (2012). Seasonal variations in vertical migration of glacier lanternfish, Benthosema glaciale. Marine Biology.  ISSN 0025-3162.  159, s 1673- 1683 . doi: 10.1007/s00227-012-1953-2
• Godø, Olav Rune; Samuelsen, Annette; Macaulay, Gavin John; Patel, Ruben; Hjøllo, Solfrid Sætre; Horne, John; Kaartvedt, Stein & Johannessen, Johnny Andre (2012). Mesoscale Eddies Are Oases for Higher Trophic Marine Life. PLoS ONE.  ISSN 1932-6203.  7(1) . doi: 10.1371/journal.pone.0030161
• Kaartvedt, Stein; Klevjer, Thor A. & Aksnes, Dag Lorents (2012). Internal wave-mediated shading causes frequent vertical migrations in fishes. Marine Ecology Progress Series.  ISSN 0171-8630.  452, s 1- 10 . doi: 10.3354/meps09688
• Kaartvedt, Stein; Staby, Arved & Aksnes, Dag Lorents (2012). Efficient trawl avoidance by mesopelagic fishes causes large underestimation of their biomass. Marine Ecology Progress Series.  ISSN 0171-8630.  456, s 1- 6 . doi: 10.3354/meps09785
• Klevjer, Thor A.; Torres, Daniel J. & Kaartvedt, Stein (2012). Distribution and diel vertical movements of mesopelagic scattering layers in the Red Sea. Marine Biology.  ISSN 0025-3162.  159(8), s 1833- 1841 . doi: 10.1007/s00227-012-1973-y
• Solberg, Ingrid; Klevjer, Thor A. & Kaartvedt, Stein (2012). Continuous acoustic studies of overwintering sprat Sprattus sprattus reveal flexible behavior. Marine Ecology Progress Series.  ISSN 0171-8630.  464, s 245- 256 . doi: 10.3354/meps09877 Full text in Research Archive.
• Kaartvedt, Stein; Titelman, Josefin; Røstad, Anders & Klevjer, Thor A. (2011). Beyond the average: Diverse individual migration patterns in a population of mesopelagic jellyfish. Limnology and Oceanography.  ISSN 0024-3590.  56(6), s 2189- 2199 . doi: 10.4319/lo.2011.56.6.2189
• Klevjer, Thor A. & Kaartvedt, Stein (2011). Krill (Meganyctiphanes norvegica) swim faster at night. Limnology and Oceanography.  ISSN 0024-3590.  56(3), s 765- 774 . doi: 10.4319/lo.2011.56.3.0765
• Staby, Arved; Røstad, Anders & Kaartvedt, Stein (2011). Long-term acoustical observations of the mesopelagic fish Maurolicus muelleri reveal novel and varied vertical migration patterns. Marine Ecology Progress Series.  ISSN 0171-8630.  441, s 241- 255 . doi: 10.3354/meps09363
• Wiebe, Peter H.; Chu, Dezhang; Kaartvedt, Stein; Hundt, Anna Hoelter; Melle, Webjørn; Ona, Egil & Batta-Lona, Paola (2010). The acoustic properties of Salpa thompsoni. ICES Journal of Marine Science.  ISSN 1054-3139.  67(3), s 583- 593 . doi: 10.1093/icesjms/fsp263
• Utne-Palm, Anne Christine; Salvanes, Anne Gro Vea; Currie, Bronwen; Kaartvedt, Stein; Nilsson, Göran Erik; Braithwaite, Victoria Anne; Stecyk, Jonathan Anthony William; Hundt, Matthias; van der Bank, Megan; Flynn, Bradley; Sandvik, Guro Katrine; Klevjer, Thor A.; Sweetman, Andrew Kvassnes; Brüchert, Volker; Pittman, Karin; Peard, Kathleen R; Lunde, Ida Gjervold; Strandabø, Rønnaug & Gibbons, Mark J (2010). Trophic Structure and Community Stability in an Overfished Ecosystem. Science.  ISSN 0036-8075.  329(5989), s 333- 336 . doi: 10.1126/science.1190708
• Aksnes, Dag Lorents; Dupont, Nicolas; Staby, Arved; Fiksen, Øyvind; Kaartvedt, Stein & Aure, Jan (2009). Coastal water darkening and implications for mesopelagic regime shifts in Norwegian fjords. Marine Ecology Progress Series.  ISSN 0171-8630.  387, s 39- 49 . doi: 10.3354/meps08120
• Broms, Cecilie; Melle, Webjørn & Kaartvedt, Stein (2009). Oceanic distribution and life cycle of Calanus species in the Norwegian Sea and adjacent waters. Deep-sea research. Part II, Topical studies in oceanography.  ISSN 0967-0645.  56(21-22), s 1910- 1921 . doi: 10.1016/j.dsr2.2008.11.005
• Dupont, Nicolas; Klevjer, Thor A.; Kaartvedt, Stein & Aksnes, Dag Lorents (2009). Diel vertical migration of the deep-water jellyfish Periphylla periphylla simulated as individual responses to absolute light intensity. Limnology and Oceanography.  ISSN 0024-3590.  54(5), s 1765- 1775
• Kaartvedt, Stein; Røstad, Anders & Klevjer, Thor A. (2009). Sprat Sprattus sprattus can exploit low oxygen waters for overwintering. Marine Ecology Progress Series.  ISSN 0171-8630.  390, s 237- 249 . doi: 10.3354/meps08196
• Kaartvedt, Stein; Røstad, Anders; Klevjer, Thor A. & Staby, Arved (2009). Use of bottom-mounted echo sounders in exploring behavior of mesopelagic fishes. Marine Ecology Progress Series.  ISSN 0171-8630.  395, s 109- 118 . doi: 10.3354/meps08174
• Klevjer, Thor A.; Kaartvedt, Stein & Båmstedt, Ulf (2009). In situ behaviour and acoustic properties of the deep living jellyfish Periphylla periphylla. Journal of Plankton Research.  ISSN 0142-7873.  31(8), s 793- 803 . doi: 10.1093/plankt/fbp036
• Vestheim, Hege & Kaartvedt, Stein (2009). Vertical migration, feeding and colouration in the mesopelagic shrimp Sergestes arcticus. Journal of Plankton Research.  ISSN 0142-7873.  31(11), s 1427- 1435 . doi: 10.1093/plankt/fbp077
• Kaartvedt, Stein (2008). Photoperiod may constrain the effect of global warming in arctic marine systems. Journal of Plankton Research.  ISSN 0142-7873.  30(11), s 1203- 1206 . doi: 10.1093/plankt/fbn075
• Kaartvedt, Stein; Torgersen, Thomas; Klevjer, Thor A.; Røstad, Anders & Devine, Jennifer A. (2008). Behavior of individual mesopelagic fish in acoustic scattering layers of Norwegian fjords. Marine Ecology Progress Series.  ISSN 0171-8630.  360, s 201- 209 . doi: 10.3354/meps07364
• Kaartvedt, Stein; Klevjer, Thor A.; Torgersen, Thomas; Sørnes, Tom Asbjørn & Røstad, Anders (2007). Diel vertical migration of individual jellyfish (Periphylla periphylla). Limnology and Oceanography.  ISSN 0024-3590.  52(3), s 975- 983
• Olsen, Esben Moland; Melle, Webjørn; Kaartvedt, Stein; Holst, J C & Mork, KA (2007). Spatially structured interactions between a migratory pelagic predator, the Norwegian spring-spawning herring Clupea harengus L., and its zooplankton prey. Journal of Fish Biology.  ISSN 0022-1112.  70, s 799- 815 . doi: 10.1111/j.1095-8649.2007.01342.x
• Røstad, Anders; Kaartvedt, Stein; Klevjer, Thor A. & Melle, Webjørn (2006). Fish are attracted to vessels. ICES Journal of Marine Science.  ISSN 1054-3139.  63, s 1431- 1437
• Klevjer, Thor A. & Kaartvedt, Stein (2006). In situ target strength and behaviour of northern krill (Meganyctiphanes norvegica). ICES Journal of Marine Science.  ISSN 1054-3139.  63, s 1726- 1735
• Vestheim, Hege Finsås & Kaartvedt, Stein (2006). Plasticity in coloration as an antipredator strategy among zooplankton. Limnology and Oceanography.  ISSN 0024-3590.  51(4), s 1931- 1934
• Kaartvedt, Stein; Røstad, Anders; Fiksen, Øyvind; Melle, Webjørn; Torgersen, Thomas; Breien, Mari & Klevjer, Thor A. (2005). Piscivorous fish patrol krill swarms. Marine Ecology Progress Series.  ISSN 0171-8630.  299, s 1- 5
• Onsrud, Maren S Rasch; Kaartvedt, Stein & Breien, Mari (2005). In situ swimming speed and swimming behaviour of fish feeding on the krill Meganyctiphanes norvegica. Canadian Journal of Fisheries and Aquatic Sciences.  ISSN 0706-652X.  62, s 1822- 1832
• Vestheim, Hege Finsås; Edvardsen, Bente & Kaartvedt, Stein (2005). Assessing feeding of a carnivorous copepod using species-specific PCR. Marine Biology.  ISSN 0025-3162.  147, s 381- 385
• Vestheim, Hege Finsås; Kaartvedt, Stein & Edvardsen, Bente (2005). State-dependent vertical distribution of the carnivore copepod Pareuchaeta norvegica. Journal of Plankton Research.  ISSN 0142-7873.  27, s 19- 26
• Onsrud, Maren S Rasch; Kaartvedt, Stein; Røstad, Anders & Klevjer, Thor A. (2004). Vertical distribution and feeding patterns in fish foraging on the krill Meganyctiphanes norvegica. ICES Journal of Marine Science.  ISSN 1054-3139.  61, s 1278- 1290
• Schøyen, Merete & Kaartvedt, Stein (2004). Vertical distribution and feeding of the copepod Chiridius armatus. Marine Biology.  ISSN 0025-3162.  145, s 159- 165 Show summary

  Adult females of the copepod Chiridius armatus inhabited the lower half of a 200-m water column during winter and spring. Their distribution became gradually shallower during summer and autumn. Female C. armatus carried out diel vertical migrations, with shallower population distribution at night compared to day, although normally with few individuals captured in the upper 50 m. Enumeration of fecal pellets produced by freshly collected individuals showed that C. armatus was foraging throughout the year. Production of fecal pellets was at a minimum in February and at a maximum in April. Individuals from all depths produced fecal pellets, but the numbers seemed to decrease by depth. Numbers of fecal pellets were greatest for individuals captured at night. The omnivorous C. armatus consistently produced many more fecal pellets than the concurrently studied, strictly carnivorous copepod Paraeuchaeta norvegica. We ascribe the relatively high number of fecal pellets to the higher content of indigestible components in plant material than in animal food. The assumption of phytoplankton as a prevailing food source got qualitative support from scanning electron microscope pictures, showing that fecal pellets mainly contained phytoplankton.

• Båmstedt, Ulf; Kaartvedt, Stein & Youngbluth, Mark (2003). An evaluation of acoustic and video methods to estimate the abundance and vertical distribution of jellyfish. Journal of Plankton Research.  ISSN 0142-7873.  25, s 1307- 1318
• Klevjer, Thor A. & Kaartvedt, Stein (2003). Split-beam target tracking can be used to study the swimming behavior of deep-living plankton in situ. Aquatic Living Resources.  ISSN 0990-7440.  16, s 293- 298
• Skarra, Hilde & Kaartvedt, Stein (2003). Vertical distribution and feeding of the carnivorous copepod Paraeuchaeta norvegica. Marine Ecology Progress Series.  ISSN 0171-8630.  249, s 215- 222
• Kaartvedt, Stein; Dale, Trine; Bagøien, Espen & Viken, Tom (2002). Bi-modal vertical distribution of the carnivorous copepod Paraechaeta norvegica. Journal of Plankton Research.  ISSN 0142-7873.  24, s 155- 158
• Kaartvedt, Stein; Larsen, Tom; Hjelmseth, Knut & Onsrud, Maren S Rasch (2002). Is the omnivorous krill Meganyctiphanes norvegica primarily a selectively feeding carnivore?. Marine Ecology Progress Series.  ISSN 0171-8630.  228, s 193- 204
• Torgersen, Thomas; Karlsbakk, Egil & Kaartvedt, Stein (2002). Deviating vertical distribution and increased conspicuousness of parasitized Calanus. Limnology and Oceanography.  ISSN 0024-3590.  47, s 1187- 1191
• Dale, Trine; Kaartvedt, Stein; Ellertsen, Bjørnar & Amundsen, Rita (2001). Large scale oceanic distribution and population structure of Calanus finmarchicus in relation to physical environment, food and predators. Marine Biology.  ISSN 0025-3162.  139, s 561- 574
• Fleddum, Annelise; Kaartvedt, Stein & Ellertsen, Bjørnar (2001). Distribution and feeding of the carnivorous copepod Paraeuchaeta norvegica in habitats of shallow prey assemblages and midnight sun. Marine Biology.  ISSN 0025-3162.  139, s 719- 726
• Bagøien, Espen; Kaartvedt, Stein; Aksnes, Dag L. & Eiane, Ketil (2001). Vertical distribution and mortality of overwintering Calanus. Limnology and Oceanography.  ISSN 0024-3590.  46, s 1494- 1510
• Dale, Trine; Kaartvedt, Stein; Ellertsen, Bjørnar & Amundsen, Rita (2001). Large-scale oceanic distribution and population structure of Calanus finmarchicus in relation to physical food and predators. Marine Biology.  ISSN 0025-3162.  139(3), s 561- 574 . doi: 10.1007/s002270100605 Show summary

  The investigation was carried out from 62 degreesN to 73 degreesN and from WE to I PW in the Norwegian Sea during 19 June-12 July 1997. Regional differences in the phase of the seasonal development of the plankton community were evident, most pronounced across the Arctic front. In the Coastal and eastern Atlantic domains, post-bloom conditions prevailed, characterised by low chlorophyll a (chl a) levels and a phytoplankton assemblage dominated by coccolithophorids and small flagellates. During the study period, egg production rates of Calanus finmarchicus were low (< 10 eggs female I day(-1)), older copepodite stages dominated, and the seasonal descent to deeper waters had started. In the Arctic domain, bloom conditions were evident by high chl a levels and a high abundance of large diatoms. Egg production rates were higher (a maximum of 29 eggs female(-1) day(-1)), but the dominance of stages' CI-CIII indicated that considerable spawning had already occurred prior to the spring bloom. The seasonal descent had barely started. Both invertebrate and fish predators were most abundant in the Coastal and eastern Atlantic domains, with abundance strongly decreasing northwestwards. No tight relationship between total abundance of invertebrate or fish predators and that of C. finmarchicus was apparent. However, a weak, but significant, relationship between abundance of young stages of chaetognaths and Euchaeta spp. versus young stages of C. finmarchicus was found, indicating that these invertebrate predators develop parallel to the development of the new cohort of C. finmarchicus. In early summer, C. finmarchicus had reached overwintering stages, and had started to accumulate in deeper waters in areas with the highest abundance of horizontally migratory planktivorous fish.

• Torgersen, Thomas & Kaartvedt, Stein (2001). In situ swimming behaviour of individual mesopelagic fish studied by split-beam echo target tracking. ICES Journal of Marine Science.  ISSN 1054-3139.  58, s 346- 354
• Bagøien, Espen; Kaartvedt, Stein & Øveraas, Sidsel (2000). Seasonal vertical migration of Calanus spp. in Oslofjorden. Sarsia.  ISSN 0036-4827.  85, s 299- 311
• Bucklin, Ann; Kaartvedt, Stein; Guarnieri, Maria & Goswami, U. (2000). Population genetics of drifting (Calanus spp.) and resident (Acartia clausi) plankton in Norwegian fjords. Journal of Plankton Research.  ISSN 0142-7873.  22, s 1237- 1251
• Dale, Trine & Kaartvedt, Stein (2000). Diel patterns in stage specific vertical migration of Calanus finmarchicus in habitats with midnight sun. ICES Journal of Marine Science.  ISSN 1054-3139.  57, s 1800- 1818
• Kaartvedt, Stein (2000). Life history of Calanus finmarchicus in the Norwegian Sea in relation to planktivorous fish. ICES Journal of Marine Science.  ISSN 1054-3139.  57, s 1819- 1824
• Olsen, Esben Moland; Jørstad, Tom & Kaartvedt, Stein (2000). The feeding strategies of two large marine copepods. Journal of Plankton Research.  ISSN 0142-7873.  22, s 1513- 1528
• Dale, Trine; Bagøien, Espen; Melle, Webjørn & Kaartvedt, Stein (1999). Can predator avoidance explain varying overwintering depth of Calanus in different oceanic water masses?. Marine Ecology Progress Series.  ISSN 0171-8630.  179, s 113- 121
• Bucklin, Ann; Guarnieri, Maria; Hill, R. Sean; Bentley, Alyssa M. & Kaartvedt, Stein (1999). Taxonomic and systematic assessment of planktonic copepods using mitochondrial COI sequence variation and competitive, species-specific PCR. Hydrobiologia.  ISSN 0018-8158.
• Eiane, Ketil; Aksnes, Dag L.; Bagøien, Espen & Kaartvedt, Stein (1999). Fish or jellies - a question of visibility?. Limnology and Oceanography.  ISSN 0024-3590.  44, s 1352- 1357
• Tiselius, Peter; Jonsson, Per R.; Kaartvedt, Stein; Olsen, Esben Moland & Jørstad, Tom (1997). Effects of copepod foraging behavior on predation risk: an experimental study of the predatory copepod Paraeuchaeta norveigca feeding on Acartia clausi and A. tonsa (Copepoda). Limnology and Oceanography.  ISSN 0024-3590.  42, s 164- 170

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• Røstad, Anders; Kaartvedt, Stein & Aksnes, Dag Lorents (2016). Erratum to “Light comfort zones of mesopelagic acoustic scattering layers in two contrasting optical environments” (Deep-Sea Research (2016) 113(Part I) (1–6) (S0967063715300224) (10.1016/j.dsr.2016.02.020)). Deep Sea Research Part I: Oceanographic Research Papers.  ISSN 0967-0637.  114, s 162- 164 . doi: 10.1016/j.dsr.2016.05.001
• Solberg, Ingrid; Kaartvedt, Stein & Klevjer, Thor A. (2013). The use of echosounders for long-term studies of the overwintering ecology of sprat (Sprattus sprattus).
• Iversen, Svein Arnholt; Melle, Webjørn Raunsgård; Bagøien, Espen; chu, d; Edvardsen, Bente; Ellertsen, Bjørnar; Grønningsæter, Eirik; Jørstad, Knut; Karlsbakk, Egil; Klevjer, Thor Aleksander; Knutsen, Tor; Korneliussen, Rolf; kowall, h; Krafft, Bjørn Arne; Kaartvedt, Stein; lona, pb; Murray, S.; Naustvoll, Lars Johan; Nøttestad, Leif; Ostrowski, Marek; siegel, volker; Skagseth, Øystein; Søiland, Henrik; Zhao, X & Broms, Cecilie (2008). The Antarctic krill and ecosystem survey with r/v GO Sars, in 2008.
• Misund, Ole Arve; Gammelsrød, Tor; Kaartvedt, Stein; Mikelborg, Øystein; Moksness, Erlend & Røttingen, Ingolf (2006). Forskningsfaglig begrunnelse for fornying av forskningsfartøy.
• Fiksen, Øyvind; Varpe, Øystein & Kaartvedt, S (2004). Reply to Horizons Article &quot;Some ideas about the role of lipids in the life cycle of Calanus finmarchicus&quot; Irigoien (2004): II. Journal of Plankton Research.  ISSN 0142-7873.  26, s 981- 981
• Kaartvedt, Stein (1999). Feeding and antipredator behavior of the krill Meganyctiphanes norvegica.
• Kaartvedt, Stein (1999). Feeding and antipredator behavior of the krill Meganyctiphanes norvegica.
• Kaartvedt, Stein (1999). Fish predation on krill and krill antipredator responses.
• Kaartvedt, Stein (1999). Life history of Calanus finmarchicus in the Norwegian Sea in relation to fish predators.
• Kaartvedt, Stein (1997). Plankton behaviour and life cycles in advective environments.
• Kaartvedt, Stein (1988). Significance of vertical migrations for advection and retention of fjord-living crustaceans.

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