- E-mailkjersti.sjotun@uib.no
- Phone+47 55 58 44 28
- Visitor AddressThormøhlens gate 53 A/B5006 Bergen
- Postal AddressPostboks 78035020 Bergen
My research is on seaweeds. Seaweeds are very important primary producers in the coastal area, they form habitats for myriads of associated animals, they can function as devices for measuring levels of heavy metals in the environment, and they can be harvested or cultured for food or valuable biochemical components such as agar and alginate. My main interests are seaweed ecology, and how seaweeds evolve and adapt to the environment. Some of the topics I study:
- Evolution, morphological variation and speciation processes in the genus Fucus
- Effects of invasive seaweeds on indigenous coastal communities
- Changes in seaweed communities due to environmental impact and climate changes
- (2023). Phaeoviruses Present in Cultured and Natural Kelp Species, Saccharina latissima and Laminaria hyperborea (Phaeophyceae, Laminariales), in Norway. Viruses. 14 pages.
- (2022). Going With the Flow – Population Genetics of the Kelp Saccharina latissima (Phaeophyceae, Laminariales). Frontiers in Marine Science. 15 pages.
- (2022). A review of reproduction in the seaweed genus Fucus (Ochrophyta, Fucales): Background for renewed consideration as a model organism. Frontiers in Marine Science. 22 pages.
- (2021). Fauna associated with non-native Sargassum muticum (Fucales, Phaeophyceae) vary with thallus morphology and site type (sounds and bays). Marine Biology Research. 1-14.
- (2021). Charting a course for genetic diversity in the UN Decade of Ocean Science. Evolutionary Applications. 1497-1518.
- (2020). Alien species in Norway: Results from quantitative ecological impact assessments. Ecological Solutions and Evidence. 12 pages.
- (2019). Alien plants, animals, fungi and algae in Norway: an inventory of neobiota. Biological Invasions. 2997-3012.
- (2019). A field study of the edible red alga Vertebrata lanosa (Rhodophyta). Journal of Applied Phycology. 1-11.
- (2019). A DNA barcode survey of marine macroalgae from Bergen (Norway). Marine Biology Research. 580-589.
- (2017). Unravelling the complexity of salt marsh ‘Fucus cottonii’ forms (Phaeophyceae, Fucales). European journal of phycology. 360-370.
- (2017). Growth and competition in a warmer ocean: A field experiment with a non-native and two native habitat-building seaweeds. Marine Ecology Progress Series. 85-99.
- (2017). Characterization and seasonal variation of individual flavonoids in Zostera marina and Zostera noltii from Norwegian coastal waters. Biochemical Systematics and Ecology. 42-50.
- (2017). Can an old alien benefit from rising ocean temperatures? An experimental and field study on the growth and local distribution of Codium fragile subsp. fragile (Chlorophyta). Marine Biology.
- (2016). Epiphytic macroalgae mediate the impact of a non-native alga on associated fauna. Hydrobiologia. 35-49.
- (2016). Dasya adela sp. nov. (Rhodophyta, Ceramiales), an enigmatic new Dasya from a landlocked fjord in southwest Norway. Phycological Research. 79-94.
- (2016). Codium fragile in Norway: subspecies identity and morphology. Botanica Marina. 439-450.
- (2015). Climatic and environmental factors influencing occurrence and distribution of macroalgae – a fjord gradient revisited. Marine Ecology Progress Series. 73-88.
- (2014). Regional impact from fin-fish farming in an intensive production area (Hardangerfjord, Norway). Marine Biology Research. 241-252.
- (2014). Historical changes in macroalgal communities in Hardangerfjord (Norway). Marine Biology Research. 226-240.
- (2014). Correlative evidence for competition between fucus serratus and the introduced chlorophyte codium fragile subsp. fragile on the southwest coast of norway. Botanica Marina. 85-97.
- (2012). Bacterial diversity in relation to secondary production and succession on surfaces of the kelp Laminaria hyperborea. The ISME Journal. 2188-2198.
- (2011). Utilization of kelp-derived carbon sources by kelp surface-associated bacteria. Aquatic Microbial Ecology. 191-199.
- (2011). Does the amphipod fauna associated with epiphytes on kelp (Laminaria hyperborea) change with depth? Marine Biology Research. 224-234.
- (2011). Differential concentration of Technetium-99 (99Tc) in common intertidal molluscs with different food habits. Marine Pollution Bulletin. 2420-2426.
- (2010). Technetium-99 (Tc-99) in annual growth segments of knotted wrack (Ascophyllum nodosum). Science of the Total Environment. 5575-5582.
- (2010). Seasonal dynamics of bacterial biofilms on the kelp Laminaria hyperborea. Aquatic Microbial Ecology. 71-83.
- (2010). Multi-trophic consequences of kelp harvest. Biological Conservation. 2054-2062.
- (2008). Present distribution and possible vectors of introductions of the alga Heterosiphonia japonica (Ceramiales, Rhodophyta) in Europe. Aquatic Invasions. 389-406.
- (2008). Changes of macroalgal biodiversity in sublittoral sites in southwest Norway: impact of an introduced species or higher temperature? Marine Biology Research. 414-428.
- (2008). Being abundant is not enough: a decrease in effective population size over eight generations in a Norwegian population of the seaweed, Fucus serratus. Biology Letters. 755-757.
- (2007). Grazer-controlled recruitment of the introduced Sargassum muticum (Phaeophyceae, Fucales) in northern Europe. Marine Ecology Progress Series. 127-138.
- (2007). First report of the Japanese red alga Antithamnion nipponicum (Ceramiales, Rhodophyta) in Norway, an invasive species new to northern Europe. Aquatic Invasions. 431-434.
- (2006). Vegetative reproduction in "Heterosiphonia japonica" (Dasyaceae, Ceramiales), an introduced red alga on European coasts. Botanica Marina. 191-199.
- (2006). The combined effect of canopy shading and sea urchin grazing on recruitment in kelp forest (Laminaria hyperborea). Marine Biology Research. 24-32.
- (2005). Demographic variation in the kelp Laminaria hyperborea along a latitudinal gradient. Marine Biology. 1051-1062.
- (2004). The newly introduced species Heterosiphonia japonica Yendo (Dasyaceae, Rhodophyta): geographical distribution and abundance at the Norwegian southwest coast. Sarsia. 211-218.
- (2004). The newly introduced species Heterosiphonia japonica Yendo (Dasyaceae, Rhodophyta): geographical distribution and abundance at the Norwegian southwest coast. Sarsia. 211-217.
- (2022). BESTEMMELSESNØKLER TIL NORSKE MARINE MAKROALGER 4. METODER, ORDFORKLARINGER OG ARTSREGISTER. .
- (2017). Assessment of the risks associated with the import and release of hand-reared mallards for hunting purposes. Opinion of the Panel on Alien Organisms and Trade in Endangered Species (CITES) of the Norwegian Scientific Committee for Food Safety. 2017:23. 2017:23. .
- (2017). Assessment of the potential connection between Tilia trees and bumblebee Death. Opinion of the Panel on Alien organisms and trade in endangered species (CITES) of the Norwegian Scientific Committee for Food Safety. 2017:15. 2017:15. .
- (2016). Assessment of the risks to Norwegian biodiversity from the import and keeping of terrestrial arachnids and insects. Opinion of the Panel on Alien Organisms and Trade in Endangered species of the Norwegian Scientific Committee for Food Safety. 2016:36. 2016:36. .
- (2016). Assessment of the risks to Norwegian biodiversity from the import and keeping of aquarium and garden pond plants. Opinion of the Panel on Alien Organisms and Trade in Endangered Species (CITES) of the Norwegian Scientific Committee for Food Safety. 2016:50. 2016:50. .
- (2016). Assessment of species listing proposals for CITES CoP17. Opinion of the Panel on Alien Organisms and Trade in Endangered Species (CITES) of the Norwegian Scientific Committee for Food Safety. 2016:38. 2016:38. .
- (2015). Risikovurdering ved utseting av ikke-stedegen tare. .
- (2013). Utvikling av indikatoren «sårbare og truete arter» for Nordsjøen, Norskehavet og Barentshavet. En oversikt over forekomst og kunnskapsgrunnlag for truete arter og ansvarsarter i norske sjøområder. 6509. 6509. .
- (2012). Kartlegging av fremmede marine arter i Hordaland. 2. 2. .
- (2011). Vurdering av eutrofisituasjonen i kystområder, med særlig fokus på Hardangerfjorden og Boknafjorden. .
- (2004). Biomass survey of Laminaria digitata in the Smøla area. 2004-11. 2004-11. .
- (2019). MACROSEA - A knowledge Platform for Industrial Macroalgae Cultivation.
- (2018). Taredyrking – en næring i vekst.
- (2004). Population structure of Laminaria digitata (Hudson) J.V. Lamouroux from three different areas in the Northeast Atlantic Ocean.
- (2014). Interactions between salmon farming and the ecosystem: Lessons from the Hardangerfjord, western Norway. Marine Biology Research. 199-202.
- (2011). Norwegian fjords: from natural history to ecosystem ecology and beyond. Marine Biology Research. 421-424.
- (2011). Norwegian fjords: From natural history to ecosystem ecology and beyaond. Marine Biology Research. 421-424.
- (2018). Marine Ecological Field Methods - A guide for marine biologists and fisheries scientists. John Wiley & Sons.
- (2005). Opptak og lagring av ammonium hos Fucus serratus (L.) og Cladophora rupestris (L.) Kütz.
- (2007). Does the composition of amphipods associated to epiphytes on kelp (Laminaria hyperborea) change with depth?
- (2006). The survival and viability of Saccharina latissima ((L.) Lane, Mayes, Druehl et Saunders) spores and microscopic sporophytes in temperatures of 18-22°C.
- (2020). Data from: Ecological impact assessments of alien species in Norway.
- (2017). Codium fragile subsp. fragile and Sargassum muticum: Non-native seaweeds in a changing environment.
- (1995). Adaptive aspects of growth and reproduction in two North Atlantic Laminaria species. -Dr. scient. Thesis.
- (2018). The marine Environment. 31 pages.
- (2018). Sorting specimens and preserving materials. 30 pages.
- (2018). Sampling gears and equipment. 46 pages.
- (2018). Planning marine field studies. 41 pages.
- (2018). Data analysis. 57 pages.
- (2006). Alger - Cynanophyta, Rhodophyta, Phaeophyceae, Ulvophyceae, Charophyceae. 8 pages.
- (2009). GENETIC SEPARATION OF DIFFERENT ENTITIES OF MASTOCARPUS STELLATUS (STACKHOUSE) GUIRY. Phycologia. 121-122.
- (2024). Effects of climate change on herbivory in macroalgae: a laboratory experiment.
- (2023). Mapping and DNA barcoding the brown algal diversity within the orders Ectocarpales, Ralfsiales and Sphacelariales in Norway.
- (2016). Analysis of Flavonoids in the Seagrass Zostera Marina L.
- (2015). Alger Cyanophyta, Rhodophyta, Chlorophyta, Ochrophyta. . In:
- (2015). Norsk rødliste for arter 2015. Versjon 1.2.
- (2010). Alger: Cyanophyta, rhodophyta, chlorophyta, ochrophyta. 79-86. In:
- (2010). Norsk rødliste for arter 2010. The 2010 Norwegian Red List for Species. Artsdatabanken.
More information in national current research information system (CRIStin)
Ribeiro PA, Næss T, Dahle G, Asplin L, Meland K, Fredriksen S, Sjøtun K (2022). Going with the flow - population genetics of the kelp Saccharina latissima (Phaeophyceae, Laminariales). Frontiers in Marine Science DOI 10.3389/fmars.2022.876420
Sjøtun K, Armitage CS, Eilertsen M, Todt C (2021). Fauna associated with non-native Sargassum muticum (Fucales, Phaeophyceae) vary with thallus morphology and site type (sounds and bays). Marine Biological Research DOI 10.1080/17451000.2021.1994999
Thomson et al. (2021). Charting a course for genetic diversity in the UN Decade of Ocean Science. Evolutionary Applications httP://doi.org/10.1111/eva.13224
Sandvik et al. (2020). Alien species in Norway: results from quantitative ecological impact assessments. Ecological Solutions and Evidence 1 10.1002/2688-8319.12006
Sandvik H et al. (2019). Alien plants, fungi and algae in Norway: an inverntory of neobiota. Biological Invasions 21: 2997-3012
Bringloe TT, Sjøtun K, Saunders GW (2019). A DNA barcode survey of marine macroalgae from Bergen (Norway). Marine Biology Research https://doi.org/10.1080/17451000.2019.1699659
Bjordal MV, Jensen KH, Sjøtun K (2019). A field study of the edible red alga Vertebrata lanosa (Rhodophyta). Journal of Applied Phycology in press.
Enerstvedt KH, Lundberg A, Sjøtun IK, Fadnes P, Jordheim M (2017). Characterization and seasonal variation of Individual flavonoids in Zostera marina and Zostera noltii from Norwegian coastal waters. Biochemical Systematics and Ecology 74: 42-50
Armitage CS, Sjøtun K (2017). Can an old alien benefit from rising ocean temperatures? An experimental and field study on the growth and local distribution of Codium fragile subsp. fragile (Chlorophyta). Marine Biology DOI 10.1007/s00227-017-3170-5
Armitage CS, Husa V, Petelenz-Kurdziel EA, Sjøtun K (2017). Growth and competition in a warmer ocean: A field experiment with a non-native and two native habitat building seaweeds. Marine ecology Progress Series 573: 85–99
Sjøtun K, Heesch S, Rull Lluch J, Martín Martín R, Gómez Garreta A, Brysting AK, Coyer JA (2017). Unraveling the complexity of salt marsh "Fucus cottonii" forms (Phaeophyceae, Fucales). European Journal of Phycology doi.org/10.1080/09670262.2017.1309688
Armitage CS, Sjøtun K (2016). Codium fragile in Norway: Subspecies identity and morphology. Botanica Marina 56: 439–450
Armitage CS, Sjøtun K (2016). Epiphytic macroalgae mediate the impact of a non-native algae on associated fauna. Hydrobiologia DOI 10.1007/s10750-016-2707-9
Sjøtun K, Heggøy E, Gabrielsen TM, Rueness J (2016). Dasya adela sp. nov. (Rhodophyta, Ceramiales), an enigmatic new Dasya from a landlocked fjord in southwest Norway. Phycological Research 64: 79-94
Sjøtun K, Husa V, Asplin L, Sandvik AD (2015). Climatic and environmental factors influencing occurrence and distribution of macroalgae – a fjord gradient revisited. Marine Ecology – Progress Series 532: 73-88
Armitage C, Sjøtun K, Jensen KH (2014). Correlative evidence for competition betweenFucus serratus and the introduced chlorophyte Codium fragile subsp. fragile on the southwest coast of Norway. Botanica Marina 57: 85-97
Husa V, Steen H, Sjøtun K (2014). Historical changes in macroalgal communities in Hardangerfjord (Norway). Marine Biology Research 10: 226-240
Husa V, Kutti T, Ervik A, Sjøtun K, Kupka Hansen P, Aure J (2014). Regional impact from fin-fish farming in an intensive production area (Hardangerfjord, Norway). Marine Biology Research 10: 241-252
Bengtsson MM, Sjøtun K, Lanzén A & Øvreås L (2012). Bacterial diversity in relation to secondary production and succession on surfaces of the kelp Laminaria hyperborea. The ISME Journal 6: 2188-2198
Sjøtun K, Heldal HE, Brakstad, DS (2011). Differential concentration of Technetium-99 (99Tc) in common intertidal molluscs with different food habits. Marine Pollution Bulletin 62: 2420-2426
Brattegard T, Høisæter T, Sjøtun K, Fenchel T & Uiblein F (2011). Norwegian Fjords: from Natural History to Ecosystem Ecology and beyond. Marine Biology Research 7: 421-424 (editorial note).
Eilertsen M, Norderhaug KM & Sjøtun K (2011). Does the amphipod fauna associated to epiphytes on kelp (Laminaria hyperborea) change with depth? Marine Biology Research 7: 224-234
Bengtsson MM, Sjøtun K, Storesund JE& Øvreås L (2011). Utilization of kelp-derived carbon sources by kelp surface-associated bacteria. Aquatic Microbial Ecology 62: 191-199
Heldal HE & Sjøtun K (2010). Technetium-99 (99Tc) in annual growth segments of knotted wrack (Ascophyllum nodosum). Science of the Total Environment 408: 5575-5582
Lorentsen S-H, Sjøtun K & Grémillet D (2010). Multi-trophic consequences of kelp harvest. Biological Conservation 143: 2054-2062
Bengtsson M, Sjøtun K & Øvreås L (2010). Seasonal dynamics of bacterial biofilms on kelp (Laminaria hyperborea). Aquatic Microbial Ecology 60: 71-83
Coyer J, Hoarau G, Sjøtun K & Olsen JL (2008). Being abundant is not enough: a decrease in effective population size over eight generations in a Norwegian population of the seaweed, Fucus serratus. Biology Letters 4: 755-757
Sjøtun K, Husa V & Peña V (2008). Present distribution and possible vectors of introductions of the alga Heterosiphonia japonica (Ceramiales, Rhodophyta) in Europe. Aquatic Invasions 3: 377-394
Husa V, Sjøtun K, Brattenborg N & Lein TE (2008). Changes of macroalgal biodiversity in sublittoral sites in southwest Norway: impact of an introduced species or higher temperature? Marine Biology Research 4: 414-428
Rueness J, Heggøy E, Husa V & Sjøtun K (2007). First report of the Japanese red alga Antithamnion nipponicum (Ceramiales, Rhodophyta) in Norway, an invasive species new to northern Europe. Aquatic invasions 2: 431-434 (Short communication).
Sjøtun K, Eggereide SF & Høisæter T (2007). Grazer-controlled recruitment of the introduced Sargassum muticum (Phaeophyceae, Fucales) in northern Europe. Marine Ecology Progress Series 342: 127-138.
Husa V & Sjøtun K (2006). Vegetative reproduction in "Heterosiphonia japonica" (Dasyaceae, Ceramiales), an introduced red alga on European coasts. Botanica Marina 49: 191-199
Sjøtun K, Christie H & Fosså JH (2006). The combined effect of canopy shading and sea urchin grazing on recruitment in kelp forest (Laminaria hyperborea). Marine Biology Research 2: 24-32.
Rinde E & Sjøtun K (2005). Demographic variation in the kelp Laminaria hyperborea along a latitudinal gradient. Marine Biology 146: 1051-1062
Husa V, Sjøtun K & Lein TE (2004). The newly introduced species Heterosiphonia japonica Yendo (Dasyaceae, Rhodophyta): geographical distribution and abundance at the Norwegian southwest coast. Sarsia 89: 211-217
Sjøtun K & Schoschina EV (2002). Gametophytic development of Laminaria spp. (Laminariales, Phaeopyceae) at low temperature. Phycologia 41: 147-152