Stein Fredriksen

Image of Stein Fredriksen
Norwegian version of this page
Phone +47-22854558
Room 4303
Username
Visiting address Blindernveien 31 0371 OSLO
Postal address Postboks 1066 Blindern 0316 OSLO
Other affiliations Department of Biosciences

Academic interests

I work with benthic algae, with a particular focus on kelp forests. I am involved with solving of problems associated with charting flora in special environments, i.e. Svalbard. In the last few years also projects linked to seagrass as a habitat been of importance. I have contributed and been head of  groups regarding eutrophication and outlet of nutrients from fish farming.

Teaching

Higher education and employment history

Previous academic positions:

  • 2004- pres. Professor at the Department of Biology
  • 1995-2004 Associate Professor at the Department of Biology
  • Prior 1995 Hired on different projects

Education:

  • 1994 Dr. scient. UiO
  • 1985 Cand. real. University of Bergen

 Honoraria

  • Recieved the "Golden Pointer" from Biologisk Fagutvalg as evidence of being the best lecturer at the institute.

Academic cooperation

I have for the last 20 years worked very closely with people at the Norwegian Department for Water Research (NIVA). I also collaborate with several foreign partners on different projects on kelp forest- and seaweed research. The last years I have also fucused on benthic algal vegetation on Svalbard, in close cooperation with UNIS avd AWI (Germany).

Tags: Algae, Marine algae, Benthic algae, Kelp forest, Ecology, Seagrass systems, Eelgrass, Biodiversity, Shallow water ecology, Systematics

Publications

Fredriksen S. & H. Christie 2003. Zostera marina (Angiospermae) and Fucus serratus (Phaeophyceae) as habitat for flora and fauna – seasonal and local variation. Proceedings 17th International Seaweed Symposium, Cape Town, South Africa. pp 357-364

Norderhaug K.M., S. Fredriksen & K. Nygaard 2003. The trophic importance of Laminaria hyperborea to kelp forest consumers and the importance of bacterial degradation on food value. Marine Ecology Progress Series 255:135-144

Bjærke M.R. & S. Fredriksen 2003. Epiphytes on the invasive species Sargassum muticum at Verdens Ende, South Norway. Sarsia 88:353-364.

Fredriksen S. 2003 Food web studies in a Norwegian kelp forest based on stable isotope (d13C and d15N) analysis. Marine Ecology Progress Series  260:71-81.

Fredriksen S., H. Christie & C. Boström. 2004. Deterioration of eelgrass (Zostera marina L.) by destructive grazing by the gastropod Rissoa membranacea (J. Adams) Sarsia 89:218-222.

Abdullah M.I. & S. Fredriksen. 2004. Production, Respiration and Exudation of Dissolve Organic Matter by the kelp Laminaria hyperborea (Gunnerus) Foslie along the west coast.of Norway. Journal of the Marine Biollogical Association of the  United Kingdom. 84:887-894

Fredriksen S,., H. Christie & B.A. Sæthre 2005. Species richness in macroalgae and macrofauna assemblages on Fucus serratus L. (Phaeophyceae) and Zostera marina L. (Angiospermae) in Skagerrak, Norway.  Marine Biology Research 1:2-19.

Norderhaug K.M., H. Christie, J.H. Fosså & S. Fredriksen. 2005. Fish-macrofauna interactions in a kelp (Laminaria hyperborea) forest. Journal of the Marine Biological Association of the United Kingdom. 85:1279-1286.

Norderhaug K.M., K. Nygaard & S. Fredriksen. 2006. Importance of phlorotannin content and C:N ratio of Laminaria hyperborea in determining its palatability as food for consumers. Marine Biology Research 2:367 – 371.

Norderhaug K.M., H. Christie & S. Fredriksen. 2007. Is habitat size an important factor for faunal abundance on kelp (Laminaria hyperborea)? Journal of Sea Research 58:120-124.

Mutchler T., K.H. Dunton, A. Townsend-Small, S. Fredriksen & M.K. Rasser. 2007. Isotopic and elemental indicators of nutrient sources and status of coastal habitats in the Caribbean Sea, Yucatan Peninsula, Mexico. Estuarin, Coastal and Shelf Science 74:449-457.

Nilsen M., T. Pedersen, E.M. Nilsen & S. Fredriksen 2008. Trophic studies in a high-latitude fjord ecosystem – a comparison of stable isotope analyses (d13C and d15N) and trophic-level estimates from a mass-balance model. Canadian Journal of Fisheries and Aquatic Sciences 65:2791-2806.

Christie H., K.M. Norderhaug & S. Fredriksen 2009. Macrophytes as habitat for fauna. Marine Ecology Progress Series. 396:221-233

Fredriksen S., A. de Backer, C. Boström & H. Christie 2010. Infauna from Zostera marina (L.) meadows in Norway. Differences in vegetated and unvegetated areas. Marine Biology Research 6:189-200.

Mutchler T., R.F. Mooney, S. Wallace, L. Podsim, S. Fredriksen & K. Dunton. 2010. Origins and fate of inorganic-nitrogen from land to coastal ocean on the Yucatan Peninsula, Mexico. In: Kennish M.J. & H.W. Paerl (eds) Coastal lagoons. Critical habitats of environmental change. S. 283-305. CRC Press. Taylor & Francis Group. USA.

Andersen G. S., H. Steen, H. Christie, S. Fredriksen & F. Moy 2011. Seasonal patterns of sporophyte growth, fertility, fouling and mortality of Saccharina latissima in Skagerrak, Norway. Implications for forest recovery. Journal of Marine Biology (Open access journal). Volume 2011. doi:10.1155/2011/690375

Fredriksen S. & M. Røst Kile 2012. The algal vegetation in the outer part of Isfjorden, Spitsbergen: A revisit of Per Svendsens sites after 50 years. Polar Research 31, 17538, DOI: 10.3402/polar.v31i0.17538

Pedersen MF, Nejrup LB, Fredriksen S, Christie H &  KM Norderhaug 2012. Effects of wave exposure on population structure, demography, biomass and productivity of the kelp Laminaria hyperborea. Marine Ecology Progress Series 451:45-60.

Boström C, Baden S, Bockelman AC, Dromph K, Fredriksen S, Gustavsson C, Krause Jensen D, Möller T, Nielsen SL, Olesen B, Olsen J, Pihl L & E Rinde 2014. Distribution, structure and function of Nordic eelgrass (Zostera marina) ecosystems: implications for coastal management and conservation. Aquatic conservation: Marine and freshwater ecosystems. DOI: 10.1002/aqc.2424

Abdullah MI & S Fredriksen 2014. The exudation of nitrate by the kelp Laminaria hyperborea, an observation during in situ incubation experimants. Marine Biology Research 10: 725-730

Fagerli CW, Norderhaug KM, Christie H, Pedersen MF & S Fredriksen 2014. Predators of the destructive sea urchin grazer Strongylocentrotus droebachiensis on the Norwegian coast. Marine Ecology Progress Series 502: 207-218

Fredriksen S, Bartsch I & C Wiencke 2014. New additions to the benthic marine flora of Kongsfjorden, Western Svalbard and comparison between 1996/98 and 2012/13, Botanica Marina 57: 203-216

Fagerli CW, Norderhaug KM, Christie H, Pedersen MF & S Fredriksen 2014. Predators of the destructive urchin Strongylocentrotus droebachiensis on the Norwegian coast. Marine Ecology Progress Series 502: 207-218.

Pedersen MF, Nejrup LB, Pedersen TM & S Fredriksen 2014. Sub-canopy light conditions only allow low annual net productivity of epiphytic algae on kelp Laminaria hyperborea. Marine Ecology Progress Series 516:163-176.

Fagerli CM, Stadnizenko SG, Pedersen MF, Christie H, Fredriksen S & KM Norderhaug 2015. Population dynamics of Strongylocentrotus droebachiensis in kelp forest and barren grounds in Norway. Marine Biology DOI 10.1007/s00227-015-2663-3

Duffy Emmett J., Pamela L. Reynolds, Christoffer Boström, James A. Coyer, Mathieu Cusson, Serena Donadi, James G. Douglass, Johan S. Eklöf, Aschwin H. Engelen, Britas Klemens Eriksson, Stein Fredriksen, Lars Gamfeldt, Camilla Gustafsson, Galice Hoarau, Masakazu Hori, Kevin Hovel, Katrin Iken, Jonathan S. Lefcheck, Per-Olav Moksnes, Masahiro Nakaoka, Mary I. O'Connor, Jeanine L. Olsen, J. Paul Richardson, Jennifer L. Ruesink, Erik E. Sotka, Jonas Thormar, Matthew A. Whalen & John J. Stachowicz 2015. Biodiversity mediates top–down control in eelgrass ecosystems: a global comparative-experimental approach. Ecology letters 18: 696-705. DOI: 10.1111/ele.12448

Fredriksen S, Gabrielsen TM, Kile MR & K Sivertsen. 2015. Benthic algal vegetation in Isfjorden, Svalbard. A survey from the main fjord area. Polar Research. http://dx.doi.org/10.3402/polar.v34.25994

Bartsch I, Paar M, Fredriksen S, Schwanitz M, Daniel C, Hop H & C Wiencke  2016. Changes in kelp forest biomass and depth distribution in Kongsfjorden, Svalbard, between 1996-1998 and 2012-2014 reflect Arctic warming. Polar Biology DOI 10.1007/s00300-015-1870-1

 

  • Abdullah, Mohamed I; Fredriksen, Stein & Christie, Hartvig (2017). The impact of the kelp (Laminaria hyperborea) forest on the organic matter content in sediment of the west coast of Norway. Marine Biology Research.  ISSN 1745-1000.  13(2), s 151- 160 . doi: 10.1080/17451000.2016.1240369
  • Husa, Vivian; Hansen, Pia Kupka; Bannister, Raymond; Kutti, Tina & Fredriksen, Stein (2017). Utslipp av partikulære og løste stoffer fra matfiskanlegg. Fisken og Havet, Særnummer.  ISSN 0802-0620.  (2), s 99- 116
  • Bartsch, Inka; Paar, Martin; Fredriksen, Stein; Schwanitz, Max; Daniel, Claudia; Hop, Haakon & Wiencke, Christian (2016). Changes in kelp forest biomass and depth distribution in Kongsfjorden, Svalbard, between 1996–1998 and 2012–2014 reflect Arctic warming. Polar Biology.  ISSN 0722-4060.  s 1- 16 . doi: 10.1007/s00300-015-1870-1
  • de Araújo, Rita M. dos Santos Fernandes; Assis, Jorge; Aguillar, Ricardo; Airoldi, Laura; Bárbara, Ignacio; Bartsch, Inka; Bekkby, Trine; Christie, Hartvig C; Davoult, Dominique; Derrien-Courtel, Sandrine; Fernández, Consolación; Fredriksen, Stein; Gevaert, Francois; Gundersen, Hege; Le Gal, Aodren; Lévêque, Laurent; Mieszkowska, Nova; Norderhaug, Kjell Magnus; Oliveira, Pedro; Puente, Araceli; Rico, José M.; Rinde, Eli; Schubert, Hendrik; Strain, Elisabeth M.A.; Valero, Myriam; Viard, Frédérique & Sousa-Pinto, Isabel (2016). Status, trends and drivers of kelp forests in Europe: an expert assessment. Biodiversity and Conservation.  ISSN 0960-3115.  25(7), s 1319- 1348 . doi: 10.1007/s10531-016-1141-7
  • Peña, Viviana; Le Gall, L; Husa, Vivian; Grefsrud, Ellen Sofie; Hall-Spencer, Jason M.; Steneck, Robert S.; Fredriksen, Stein; De Clerck, Olivier; Gitmark, Janne Kim; Angles dÀuriac, M; Bekkby, Trine; Christie, H. & Rinde, Eli (2016). Reseña de proyecto: Coralalg, la biodiversidad marina oculta en noruega: búsqueda de especies crípticas en algas rojas coralinas (Norway's hidden marine biodiversity: the hunt for cryptic species within the coralline algae).. Algas: Boletín Informativo de la Sociedad Española de Ficología.  ISSN 1695-8160.  52, s 55- 58
  • Ramirez-Llodra, Eva; Rinde, Eli; Gundersen, Hege; Christie, Hartvig; Fagerli, Camilla With; Fredriksen, Stein; Gitmark, Janne Kim; Norling, Karl; Walday, Mats Gunnar & Norderhaug, Kjell Magnus (2016). A snap shot of the short-term response of crustaceans to macrophyte detritus in the deep Oslofjord. Scientific Reports.  ISSN 2045-2322.  6 . doi: 10.1038/srep23800
  • Silberberger, Marc Jürgen; Thormar, Jonas & Fredriksen, Stein (2016). Small-scale removal of seagrass (Zostera marina L.): effects on the infaunal community. Marine Biology Research.  ISSN 1745-1000.  12, s 993- 1002 . doi: 10.1080/17451000.2016.1225959
  • Duffy, J. Emmett; Reynolds, Pamela L.; Boström, Christoffer; Coyer, James A.; Cusson, Mathieu; Donadi, Serena; Douglass, James G.; Eklöf, Johan S.; Engelen, Aschwin H.; Eriksson, Britas Klemens; Fredriksen, Stein; Gamfeldt, Lars; Gustafsson, Camilla; Hoarau, Galice; Hori, Masakazu; Hovel, Kevin; Iken, Katrin; Lefcheck, Jonathan S.; Moksnes, Per-Olav; Nakaoka, Masahiro; O'Connor, Mary I.; Olsen, Jeanine L.; Richardson, J. Paul; Ruesink, Jennifer L.; Sotka, Erik E.; Thormar, Jonas Gjaldbæk; Whalen, Matthew A. & Stachowicz, John J. (2015). Biodiversity mediates top-down control in eelgrass ecosystems: a global comparative-experimental approach. Ecology Letters.  ISSN 1461-023X.  18(7), s 696- 705 . doi: 10.1111/ele.12448
  • Fagerli, Camilla With; Stadniczenko, Sandra Gran; Pedersen, Morten Foldager; Christie, Hartvig C; Fredriksen, Stein & Norderhaug, Kjell Magnus (2015). Population dynamics of Strongylocentrotus droebachiensis in kelp forests and barren grounds in Norway. Marine Biology.  ISSN 0025-3162.  162(6), s 1215- 1226 . doi: 10.1007/s00227-015-2663-3
  • Fredriksen, Stein; Gabrielsen, Tove M.; Kile, Maia Røst & Sivertsen, Knut (2015). Benthic algal vegetation in Isfjorden, Svalbard. Polar Research.  ISSN 0800-0395.  34, s 1- 9 . doi: 10.3402/polar.v34.25994 Full text in Research Archive
  • Abdullah, Mohamed I & Fredriksen, Stein (2014). The exudation of nitrate by the kelp Laminaria hyperborea, an observation during in situ incubation experiments. Marine Biology Research.  ISSN 1745-1000.  10(7), s 725- 730 . doi: 10.1080/17451000.2013.850514
  • Boström, Christoffer; Baden, Susanne; Bockelmann, Anna-Christina; Dromph, Karsten; Fredriksen, Stein; Gustafsson, Camilla; Krause-Jensen, Dorte; Möller, Tiia; Nielsen, Søren Laurentius; Olesen, Birgit; Olsen, Jeanine; Pihl, Leif & Rinde, Eli (2014). Distribution, structure and function of Nordic eelgrass (Zostera marina) ecosystems: Implications for coastal management and conservation . Aquatic conservation.  ISSN 1052-7613.  24(3), s 410- 434 . doi: 10.1002/aqc.2424 Full text in Research Archive
  • Fagerli, Camilla With; Norderhaug, Kjell Magnus; Christie, Hartvig C; Pedersen, Morten Foldager & Fredriksen, Stein (2014). Predators of the destructive sea urchin grazer Strongylocentrotus droebachiensis on the Norwegian coast . Marine Ecology Progress Series.  ISSN 0171-8630.  502, s 207- 218 . doi: 10.3354/meps10701 Full text in Research Archive
  • Fredriksen, Stein; Bartsch, I & Wiencke, Christian (2014). New additions to the benthic marine flora of Kongsfjorden, western Svalbard, and comparison between 1996/1998 and 2012/2013. Botanica Marina.  ISSN 0006-8055.  57(3), s 203- 216 . doi: 10.1515/bot-2013-0119
  • Pedersen, Morten foldager; Nejrup, Lars; Pedersen, Troels & Fredriksen, Stein (2014). Sub-canopy light conditions only allow low annual net productivity of epiphytic algae on kelp Laminaria hyperborea. Marine Ecology Progress Series.  ISSN 0171-8630.  516, s 163- 176 . doi: 10.3354/meps11019
  • Fredriksen, Stein & Kile, Maia Røst (2012). The algal vegetation in the outer part of Isfjorden, Spitsbergen: revisiting Per Svendsen's sites 50 years later. Polar Research.  ISSN 0800-0395.  31 . doi: 10.3402/polar.v31i0.17538
  • Pedersen, Morten F; Nejrup, Lars B; Fredriksen, Stein; Christie, Hartvig C & Norderhaug, Kjell Magnus (2012). Effects of wave exposure on population structure, demography, biomass and productivity of the kelp Laminaria hyperborea. Marine Ecology Progress Series.  ISSN 0171-8630.  451, s 45- 60 . doi: 10.3354/meps09594
  • Andersen, Guri Sogn; Steen, Henning; Christie, Hartvig C; Fredriksen, Stein & Moy, Frithjof (2011). Seasonal Patterns of Sporophyte Growth, Fertility, Fouling, and Mortality of Saccharina latissima in Skagerrak, Norway: Implications for Forest Recovery. Journal of Marine Biology.  ISSN 1687-9481.  2011 . doi: 10.1155/2011/690375
  • Fredriksen, Stein; De Backer, Annelies; Boström, C. & Christie, Hartvig C (2010). Infauna from Zostera marina L. meadows in Norway. Differences in vegetated and unvegetated areas. Marine Biology Research.  ISSN 1745-1000.  6, s 189- 200 . doi: 10.1080/17451000903042461
  • Mutchler, T; Mooney, R.F; Wallace, S; Podsim, L; Fredriksen, Stein & Dunton, KH (2010). Origins and fate of inorganic-nitrogen from land to coastal ocean on the Yucatan Peninsula, Mexico, In MJ Kennish & HW Paerl (ed.),  Coastal lagoons. Critical habitats of environmental change.  CRC Press.  ISBN 978-1-4200-8830-4.  Chapter 12.  s 283 - 305
  • Christie, H.; Norderhaug, K.M. & Fredriksen, Stein (2009). Macrophytes as habitat for fauna. Marine Ecology Progress Series.  ISSN 0171-8630.  396, s 221- 233 . doi: 10.3354/meps08351
  • Nilsen, Marianne; Pedersen, Torstein; Nilsen, Einar Magnus & Fredriksen, Stein (2008). Trophic studies in a high-latitude fjord ecosystem – a comparison of stable isotope analyses (δ13C and δ15N) and trophic-level estimates from a mass-balance model. Canadian Journal of Fisheries and Aquatic Sciences.  ISSN 0706-652X.  65, s 2791- 2806
  • Nilsen, marianne; Pedersen, Torstein; Nilssen, Einar Magnus & Fredriksen, Stein (2008). Trophic studies in a high-latitude fjord ecosystem - a comparison of stable isotope analyses (delta 13C and delta 15N)and trophic-level estimates from a mass-balance model. Canadian Journal of Fisheries and Aquatic Sciences.  ISSN 0706-652X.  65(12), s 2791- 2806 . doi: 10.1016/j.dsr2.2008.05.008
  • Mutchler, T; Dunton, K; Townsend-Small, A; Fredriksen, Stein & Rasser, M (2007). Isotopic and elemental indicators of nutrient sources and status of coastal habitats in the Caribbean Sea, Yucatan Peninsula, Mexico. Estuarine, Coastal and Shelf Science.  ISSN 0272-7714.  74, s 449- 457 . doi: 10.1016/j.ecss.2007.04.005
  • Norderhaug, K.M.; Christie, H. & Fredriksen, Stein (2007). Is habitat size an important factor for faunal abundances on kelp (Laminaria hyperborea)?. Journal of Sea Research.  ISSN 1385-1101.  58, s 120- 124 . doi: 10.1016/j.seares.2007.03.001
  • Norderhaug, K.M.; Nygaard, K. & Fredriksen, Stein (2006). Importance of phlorotannin content and C:N ratio of Laminaria hyperborea in determining its palatability as food for consumers. Marine Biology Research.  ISSN 1745-1000.  2, s 367- 371
  • Rueness, Jan; Bjærke, M.R.; Fredriksen, Stein; Langangen, Anders; Lindstrøm, Eli Anne; Moy, Frithjof & Sjøtun, Kjersti (2006). Alger. Cyanophyta, Rhodophyta, Phaeophyta, Ulvophyceae, Charophyceae, I: J.A. Kålås; Å. Viken & T. Bakken (red.),  Norsk Rødliste 2006.  Artsdatabanken.  ISBN 8292838007.  Kapittel.  s 95 - 101
  • Fredriksen, Stein; Christie, H. & Sæthre, Bjarte Andre (2005). Species richness in macroalgae and macrofauna assemblages on Fucus serratus L. (Phaeophyceae) and Zostera marina L. (Angiospermae) in Skagerrak, Norway. Marine Biology Research.  ISSN 1745-1000.  1(1), s 2- 19
  • Norderhaug, K.M.; Christie, H.; Fosså, Jan Helge & Fredriksen, Stein (2005). Fish - macrofauna interactions in a kelp (Laminaria hyperborea) forest. Journal of the Marine Biological Association of the United Kingdom.  ISSN 0025-3154.  85, s 1279- 1286
  • Abdullah, Mohamed I & Fredriksen, Stein (2004). Production, respiration, and exudation of dissolved organic matter by the kelp Laminaria hyperborea along the west coast of Norway. Journal of the Marine Biological Association of the United Kingdom.  ISSN 0025-3154.  84, s 887- 894
  • Fredriksen, Stein; Christie, H. & Boström, Christoffer (2004). Deterioration of eelgrass (Zostera marina L.) through destructive grazing by the gastropod Rissoa membranacea (J. Adams). Sarsia.  ISSN 0036-4827.  89, s 218- 222
  • Bjærke, M.R. & Fredriksen, Stein (2003). Epiphytes on the invasive species Sargassum muticum at Verdens Ende, South Norway. Sarsia.  ISSN 0036-4827.  88, s 353- 364
  • Fredriksen, Stein (2003). Food web studies in a Norwegian kelp forest based on stable isotope (?13C and ?15N) analysis. Marine Ecology Progress Series.  ISSN 0171-8630.  260, s 71- 81
  • Fredriksen, Stein (2003). Zostera marina (Angiospermae) and Fucus serratus (Phaeophyceae) as habitat for flora and fauna � seasonal and local variation. Proceedings / International Seaweed Symposium.  17, s 357- 364
  • Norderhaug, Kjell Magnus; Fredriksen, Stein & Nygaard, K. (2003). The trophic importance of Laminaria hyperborea to kelp forest consumers and the importance of bacterial degradation on food value. Marine Ecology Progress Series.  ISSN 0171-8630.  255, s 135- 144
  • Raven, J.; Johnston, A.M.; Kübler, J.E.; Korb, R.; McInroy, S.G.; Handley, L.L.; Scrimgeour, C.M.; Walker, D.I.; Berdall, J.; Clayton, M.N.; Vanderklift, M.; Fredriksen, Stein & Dunton, K.H. (2002). Seaweeds in cold seas: evolution and carbon acquisition. Annals of Botany.  ISSN 0305-7364.  90, s 525- 536
  • Raven, J.; Johnston, A.M.; Kübler, J.E.; Korb, R.; McInroy, S.G.; Handley, L.L.; Scrimgeour, C.M.; Walker, D.I.; Berdall, J.; Vanderklift, M.; Fredriksen, Stein & Dunton, K.H. (2002). Mecanistic interpretation of carbon isotope discrimination by marine macroalgae and seagrasses. Functional Plant Biology.  ISSN 1445-4408.  29, s 355- 378
  • Rueness, Jan & Fredriksen, Stein (1998). Intraspecific reproductive variation in Gelidium pusillum (Stackhouse) Le Jolis (Gelidiales, Rhodophyta) from Norway. Journal of Applied Phycology.  ISSN 0921-8971.  10, s 253- 260
  • Sjøtun, Kjersti; Fredriksen, Stein & Rueness, Jan (1998). Effect of canopy biomass and wave exposure on growth in Laminaria hyperborea (Laminariaceae: Phaeophyta). European journal of phycology.  ISSN 0967-0262.  33(4), s 337- 343

View all works in Cristin

  • Bartsch, Inka; Paar, Martin; Fredriksen, Stein; Hop, Haakon; Asmus, Ragnhild; Asmus, Harald; Zacher, Katharina; Bischof, Kai & Wiencke, Christian (2017). Arctic warming affects kelp forest with associated fauna in Kongsfjorden, Svalbard.
  • Bischof, Kai; Paar, Martin; Fredriksen, Stein; Wiencke, Christian; Hop, Haakon & Bartsch, Inka (2017). Retreating sea ice in coastal systems – Implications for seaweed communities in Kongsfjorden (Svalbard) and beyond.
  • Fagerli, Camilla With; Stadniczenko, Sandra Gran; Pedersen, Morten foldager; Christie, Hartvig C; Fredriksen, Stein & Norderhaug, Kjell Magnus (2016). Are skeletal ossicles in echinoids unreliable chronometers? Reply to Russell and Narváez comment on “Population dynamics of Strongylocentrotus droebachiensis in kelp forests and barren grounds in Norway” by Fagerli et al. 2015. Marine Biology.  ISSN 0025-3162.  163(7), s 160- 161 . doi: 10.1007/s00227-016-2928-5
  • Bartsch, Inka; Paar, Martin; Fredriksen, Stein & Wiencke, Christian (2015). Changes in kelp forest biomass and depth distribution in Kongsfjorden (Spitsbergen) reflect Arctic warming.
  • Bischof, Kai; Bartsch, Inka; Zachler, Katharina; Fredriksen, Stein & Wiencke, Christian (2015). Seaweed Biology in a changing Arctic.
  • Bøe, Mari; Fredriksen, Stein & Karlsen, Hans Erik (2015). Seasonal variations of fish fauna in two Zostera marina meadows in the inner Oslofjord.
  • Christie, H.; Norderhaug, K.M.; Fredriksen, Stein & Kraufvelin, Patrik (2015). How can kelp and seagrass beds persist being both food and habitat?.
  • Evankov, Ann Marie; Fredriksen, Stein; Christie, H.; Junge, Claudia & Brysting, Anne Krag (2015). Population genetic diversity and structure of two kelp species (Laminariales) in Norway.
  • Evankow, Ann; Fredriksen, Stein; Christie, Hartvig C; Junge, Claudia & Brysting, Anne Krag (2015). Genetic tools reveal diversity and structure of kelp forests in Norway.
  • Fredriksen, Stein; Moy, Frithjof Emil; Husa, Vivian; Sjøtun, Kjersti & Schneider, Susanne Claudia (2015). Alger Cyanophyta, Rhodophyta, Chlorophyta, Ochrophyta , I: Snorre Henriksen & Olga Hilmo (red.),  Norsk rødliste for arter 2015. Versjon 1.2.  Artsdatabanken.  ISBN 978-82-92838-41-9.  Alger.
  • Fredriksen, Stein & Sjøtun, Kjersti (2015). Risikovurdering ved utseting av ikke-stedegen tare.
  • Norderhaug, K.M.; Fagerli, Camilla; Andersen, Guri Sogn; Christie, H.; Moy, Frithjof Emil; Gundersen, Hege; Bekkby, Trine; Rinde, Eli; Fredriksen, Stein; Pedersen, Morten foldager & Dahl, Karsten (2015). Regime shifts in Norwegian kelp forests.
  • Andersen, A; Thormar, Jonas; Norderhaug, KM & Fredriksen, Stein (2013). Benthic communities at the opera in Bjørvika.
  • Brubak, Sissel Irene; Eikrem, Wenche; Fredriksen, Stein & Edvardsen, Bente (2013). Algal culture collection at the University of Oslo.
  • Fredriksen, Stein & Wiencke, Christian (2013). RIGHT OR WRONG CONCLUSION? THE IMPORTANCE OF EQUAL PRECISIONS LEVEL IN BIODIVERSITY STUDIES.
  • Norderhaug, Kjell Magnus; Fagerli, Camilla With; Moy, Frithjof Emil; Bekkby, Trine; Andersen, Guri Sogn; Gundersen, Hege; Rinde, Eli; Fredriksen, Stein; Pedersen, Morten F & Christie, Hartvig C (2013). Climate Change and Large Scale shifts in the Geographical Distribution of NE Atlantic Kelp Forests.
  • Norderhaug, Kjell Magnus; Fagerli, Camilla With; Moy, Frithjof Emil; Bekkby, Trine; Andersen, Guri Sogn; Rinde, Eli; Fredriksen, Stein; Pedersen, Morten Foldager & Christie, Hartvig C (2013). Climate Change and Large Scale shifts in the Geographical Distribution of NE Atlantic Kelp Forests.
  • Fagerli, C.W.; Norderhaug, K.M.; Christie, H.; Pedersen, M.F. & Fredriksen, Stein (2012). Importance of climate and predation for shifts between sea urchin dominated barren grounds and kelp forests.
  • Fredriksen, Stein (2012). Bentosalgevegetasjonen på Svalbard.
  • Fredriksen, Stein; Christie, H.; Nilsen, H.L & Sivertsen, L (2012). Spatial distribution of epiphytes and mobile fauna on Zostera marina (L.) and Fucus serratus (L.) from the Skagerrak area.
  • Fredriksen, Stein; Husa, Vivian; Skjoldal, Hein Rune; Sjøtun, Kjersti; Christie, Hartvig C; Dale, Trine & Olsen, Yngvar (2012). Ingen regional overgjødsling på Vestlandet. Havforskningsrapporten.
  • Pedersen, M.F.; Nejrup, L.B.; Pedersen, T.M. & Fredriksen, Stein (2012). Biomass & productivity of epiphytic algae on kelp Laminaria hyperborea.
  • Fredriksen, Stein & Kile, Maia Røst (2011). The algal vegetation in the outer part of Isfjorden, Spitsbergen: a revisit of Per Svendsens sites after 50 years.
  • Fredriksen, Stein; Skjoldal, HR; Husa, Vivian; Olsen, Yngvar; Christie, Hartvig C; Dale, Trine & Sjøtun, Kjersti (2011). Vurdering av eutrofisituasjonen i kystområder, med særlig fokus på Hardangerfjorden og Boknafjorden.
  • Minchin, Tanya; Fredriksen, Stein & Norderhaug, K.M. (2011). What is replacing the sugar kelp in Skagerrak?.
  • Silberberger, Marc & Fredriksen, Stein (2011). Effects of disturbance on the abundance and composition of infauna in Zosera marina L. communities.
  • Fredriksen, Stein (2010). Biodiversitet i tareskog.
  • Sjøtun, Kjersti; Fredriksen, Stein; Heggøy, Erling; Husa, Vivian; Langangen, Anders Vidar; Lindstrøm, Eli-Anne; Moy, Frithjof Emil; Rueness, Jan & Åsen, Per Arvid (2010). Alger: Cyanophyta, rhodophyta, chlorophyta, ochrophyta, I:  Norsk rødliste for arter 2010. The 2010 Norwegian Red List for Species.  Artsdatabanken.  ISBN 978-82-92838-26-6.  Alger.  s 79 - 86
  • Fredriksen, Stein (2009). Stortare fra A til Å.
  • S. Forsberg, Ida; Rustad, Ida & Fredriksen, Stein (2009). Manipuleringer i fjæra i indre Oslofjord.
  • Steinhovden, Kristine & Fredriksen, Stein (2009). Temperaturtoleranser hos forskjellige isolater av sukkertare.
  • Fredriksen, Stein (2008). Tang og tare i Nord.
  • Heiaas, Harald; Thomas, Kevin; Fredriksen, Stein & Ketil, Hylland (2008). Overvåking av fotosyntetisk effektivitet i makroalger.
  • Magnusson, Jan; Christie, H.; Fredriksen, Stein & Rueness, Jan (2008). "Grønne lunger" i byen en selvfølge - men hva med det marine nærmiljøet?. Fagrådet for vann og avløpsteknisk samarbeid i indre Oslofjord.  s 13- 15
  • Fredriksen, Stein (2007). Alger som nyttevekster. Sopp og nyttevekster.  ISSN 1504-4165.  3(4), s 10- 13
  • Sogn Andersen, Guri & Fredriksen, Stein (2007). Kelp associated epiphytes, their biomass production and community structure in relation to wave exposure and season.
  • Christie, H.; Fredriksen, Stein; Magnusson, J. & Rueness, J. (2006). Marinbiologiske forbedringer av miljøet i Bjørvika/Bispervika. Vurderinger av muligheter.
  • Sogn Andersen, Guri & Fredriksen, Stein (2006). Kelp associated epiphytes and their level of biomass production in relation to wave-exposure and season.
  • Christie, H.; Fredriksen, Stein; Kraufvelin, Patrik & Norderhaug, K.M. (2005). Tang, tareskog og ålegras som leveområde og økosystem.
  • Fredriksen, Stein (2005). Tareskogsforskningen i MARE.
  • Sakshaug, Egil; Sjøtun, Kjersti; Fredriksen, Stein; Christie, Hartvig; Fosså, Jan Helge; Dale, Trine; Sivertsen, Knut & Hedlund, Nina (2002). Nedbeiting av tareskog i Norge. Rapport fra arbeidsgruppe nedsatt av Fiskeridepartementet og Miljøverndepartementet.
  • Fredriksen, Stein (2002). Kelp forest in Western Norway.
  • Fredriksen, Stein (2002). Produksjon av partikulært materiale fra stortare. Mulig næringskilde for krepsdyr i tareskogen?.
  • Fredriksen, Stein & Christie, Hartvig (2002). Biodiversitet i makrofyttsamfunn. Variasjon i tid og rom.
  • Fredriksen, Stein & Christie, Hartvig (2002, 01. september). Om tareskogen. [Radio].  NRK TV, Ut i naturen : NRK.
  • Fredriksen, Stein; Christie, Hartvig & Boström, C. (2002). Nedbeiting av ålegras forårsaket av sneglen Rissoa membranacea.
  • Sakshaug, Egil; Christie, Hartvig; Dale, Trine; Fosså, Jan Helge; Fredriksen, Stein; Hedlund, Nina; Sivertsen, Knut & Sjøtun, Kjersti (2002). Nedbeiting av tareskog i Norge. Rapport fra arbeidsgruppe nedsatt av Fiskeridepartementet og Miljøverndepartementet. Rapport til Fiskeridepartementet .
  • Fredriksen, Stein (2000). Norwegian history.
  • Fredriksen, Stein (2000). The coast of Norway.
  • Sætre, Bjarte & Fredriksen, Stein (2000). Epifytter på ålegras og sagtang - en sammenligning mellom fire årstider.
  • Bjærke, Marit Ruge & Fredriksen, Stein (1999). Epifytter på Sargassum muticum.
  • Christie, Hartvig & Fredriksen, Stein (1999). Where have all the kelp plants gone?.
  • Fredriksen, Stein & Christie, Hartvig (1999). Biodiversitet i makrofyttsamfunn. Variasjon i tid og rom.
  • Fredriksen, Stein & Rueness, Jan (1999). Food chain studies in a Norwegian kelp forest based on stable carbon isotope analysis.
  • Gustad, E.C. & Fredriksen, Stein (1999). Bruk av stabile karbonisotoper til å spore tareskogens influensområde.
  • Sivertsen, L. & Fredriksen, Stein (1999). Epifytter på Zostera marina (ålegras).
  • Skjoldal, Hein Rune; Aure, Jan; Bakke, Torgeir; Dahl, Finn Erik; Fredriksen, Stein; Gray, John Stuart; Heldal, Mikal; Røed, Lars Petter; Olsen, Yngvar; Tangen, Karl & Molvær, Jarle (1997). The Norwegian North Sea Coastal Water: Eutriphication; Status and trends.
  • Skjoldal, Hein Rune; Bakke, Torgeir; Dahl, Finn Erik; Fredriksen, Stein; Gray, John Stuart; Heldal, Mikal; Røed, Lars Petter; Olsen, Yngvar; Tangen, Karl & Molvær, Jarle (1995). Ytre Oslofjord: Eutrofitilstand, utvikling og forventede effekter av reduserte tilførsler av næringsalter.

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Published Nov. 3, 2010 3:26 PM - Last modified Nov. 29, 2016 10:58 AM

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