• Alien plants, animals, fungi and algae in Norway:an inventory of neobiota 

      Sandvik, Hanno; Dolmen, Dag; Elven, Reidar; Falkenhaug, Tone; Forsgren, Elisabet; Hansen, Haakon; Hassel, Kristian; Husa, Vivian; Kjærstad, Gaute; Ødegaard, Frode; Pedersen, Hans Christian; Solheim, Halvor; Stokke, Bård Gunnar; Åsen, Per Arvid; Åström, Sandra Charlotte Helene; Brandrud, Tor Erik; Elven, Hallvard; Endrestøl, Anders; Finstad, Anders Gravbrøt; Fredriksen, Stein; Gammelmo, Øivind; Gjershaug, Jan Ove; Gulliksen, Bjørn; Hamnes, Inger Sofie; Hatteland, Bjørn Arild; Hegre, Hanne; Hesthagen, Trygve H.; Jelmert, Anders; Jensen, Thomas Correll; Johnsen, Stein Ivar; Karlsbakk, Egil; Magnusson, Christer; Nedreaas, Kjell Harald; Nordén, Björn; Oug, Eivind; Pedersen, Oddvar; Pedersen, Per Anker; Sjøtun, Kjersti; Skei, Jon Kristian; Solstad, Heidi; Sundheim, Leif; Swenson, Jon; Syvertsen, Per Ole; Talgø, Venche; Vandvik, Vigdis; Westergaard, Kristine Bakke; Wienerroither, Rupert; Ytrehus, Bjørnar; Hilmo, Olga; Henriksen, Snorre; Gederaas, Lisbeth (Peer reviewed; Journal article, 2019-08-03)
      We present the results of an inventory and status assessment of alien species in Norway. The inventory covered all known multicellular neobiota, 2496 in total, 1039 of which were classified as naturalised. The latter ...
    • Alien species in Norway: Results from quantitative ecological impact assessments 

      Sandvik, Hanno; Hilmo, Olga; Henriksen, Snorre; Elven, Reidar; Åsen, Per Arvid; Hegre, Hanne; Pedersen, Oddvar; Pedersen, Per Anker; Solstad, Heidi; Vandvik, Vigdis; Westergaard, Kristine Bakke; Ødegaard, Frode; Åström, Sandra Charlotte Helene; Elven, Hallvard; Endrestøl, Anders; Gammelmo, Øivind; Hatteland, Bjørn Arild; Solheim, Halvor; Nordén, Björn; Sundheim, Leif; Talgø, Venche; Falkenhaug, Tone; Gulliksen, Bjørn; Jelmert, Anders; Oug, Eivind; Sundet, Jan Henry; Forsgren, Elisabet; Finstad, Anders Gravbrøt; Hesthagen, Trygve H.; Nedreaas, Kjell Harald; Wienerroither, Rupert; Husa, Vivian; Fredriksen, Stein; Sjøtun, Kjersti; Steen, Henning; Hansen, Haakon; Hamnes, Inger Sofie; Karlsbakk, Egil; Magnusson, Christer; Ytrehus, Bjørnar; Pedersen, Hans Christian; Swenson, Jon; Syvertsen, Per Ole; Stokke, Bård Gunnar; Gjershaug, Jan Ove; Dolmen, Dag; Kjærstad, Gaute; Johnsen, Stein Ivar; Jensen, Thomas Correll; Hassel, Kristian; Gederaas, Lisbeth (Journal article, 2020)
      1. Due to globalisation, trade and transport, the spread of alien species is increasing dramatically. Some alien species become ecologically harmful by threatening native biota. This can lead to irreversible changes in ...
    • 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) 

      Armitage, Caroline Susanne; Sjøtun, Kjersti (Peer reviewed; Journal article, 2017-06)
      Codium fragile subsp. fragile (hereafter C. fragile) is a widespread non-native chlorophyte. Experimental and observational approaches were used to examine the influence of temperature on its growth and local distribution ...
    • Climatic and environmental factors influencing occurrence and distribution of macroalgae – a fjord gradient revisited 

      Sjøtun, Kjersti; Husa, Vivian; Asplin, Lars; Sandvik, Anne Dagrun (Peer reviewed; Journal article, 2015)
      During the last decades, trends of increasing sea water temperatures and precipitation have been observed in the North Atlantic. Increasing sea water temperatures are expected to have strong effects on coastal benthic ...
    • Codium fragile in Norway: subspecies identity and morphology 

      Armitage, Caroline Susanne; Sjøtun, Kjersti (Peer reviewed; Journal article, 2016)
      The green alga Codium fragile consists of 10 subspecies, of which subspecies fragile is a well-known invasive seaweed. Morphological work carried out in the 1950s suggested that there were three subspecies along the Norwegian ...
    • Correlative evidence for competition between fucus serratus and the introduced chlorophyte codium fragile subsp. fragile on the southwest coast of Norway 

      Armitage, Caroline Susanne; Sjøtun, Kjersti; Jensen, Knut Helge (Peer reviewed; Journal article, 2014)
      The distribution of Codium fragile subsp. fragile and the native canopy-forming alga Fucusserratus was recorded at 51 sites in a 20 km long, sheltered region on the southwest coast of Norway. The purpose of the study was ...
    • A DNA barcode survey of marine macroalgae from Bergen (Norway) 

      Bringloe, Trevor T; Sjøtun, Kjersti; Saunders, Gary W (Peer reviewed; Journal article, 2019)
      Safeguarding the services provided by marine forests inherently depends on an accurate understanding of macroalgal species diversity. Here, we provide the first DNA barcode survey of marine macroalgae from Norway, with a ...
    • Growth and competition in a warmer ocean: a field experiment with a non-native and two native habitat-building seaweeds 

      Armitage, Caroline Susanne; Husa, Vivian; Petelenz-Kurdziel, Elzbieta A.; Sjøtun, Kjersti (Peer reviewed; Journal article, 2017-06-21)
      Kelps and fucoids are important members of temperate seaweed communities, but may be negatively impacted by climate change and non-native species. We used a field experiment to investigate the effect of higher temperatures ...
    • Historical changes in macroalgal communities in Hardangerfjord (Norway) 

      Husa, Vivian; Steen, Henning; Sjøtun, Kjersti (Peer reviewed; Journal article, 2014)
      Hardangerfjord is the second largest fjord in Norway and is situated on the southwest coast. During the last century the fjord has been influenced by a variety of anthropogenous activities such as industry, hydro-electrical ...
    • Regional impact from fin-fish farming in an intensive production area (Hardangerfjord, Norway) 

      Husa, Vivian; Kutti, Tina; Ervik, Arne S; Sjøtun, Kjersti; Hansen, Pia Kupka; Aure, Jan (Peer reviewed; Journal article, 2014)
      The Hardangerfjord is one of the largest salmon-farming areas in Norway, with an annual production of approximately 70,000 metric tonnes. The regional impact of fin-fish farming in a fjord environment was studied during ...
    • Seasonal dynamics of bacterial biofilms on the kelp Laminaria hyperborea 

      Bengtsson, Mia M.; Sjøtun, Kjersti; Øvreås, Lise (Peer reviewed; Journal article, 2010-05)
      Seasonal variations of the cell density and bacterial community composition in biofilms growing on the surface of the kelp Laminaria hyperborea from 2 sites on the southwestern coast of Norway were investigated using total ...
    • Unravelling the complexity of salt marsh ‘Fucuscottonii’ forms (Phaeophyceae, Fucales) 

      Sjøtun, Kjersti; Heesch, Svenja; Lluch, Jordi Rull; Martín, Rafael Martín; Garreta, Amelia Gómez; Brysting, Anne Krag; Coyer, James A. (Peer reviewed; Journal article, 2017)
      Genetic affiliation, nuclear DNA content, and gamete functioning were examined in small salt marsh Fucus from three localities in western Ireland. Individuals with small and dioecious receptacles were found at all localities, ...
    • Utilization of kelp-derived carbon sources by kelp surface-associated bacteria 

      Bengtsson, Mia M.; Sjøtun, Kjersti; Storesund, Julia Endresen; Øvreås, Lise (Peer reviewed; Journal article, 2011-01)
      The surfaces of kelp are covered with bacteria that may utilize kelp-produced carbon and thereby contribute significantly to the carbon flux in kelp forest ecosystems. There is scant knowledge about the identity of these ...
    • Utvikling og læring i emnet MAR211 Marin floristikk og faunistikk 

      Sjøtun, Kjersti (UPED-skrift nr. 1/2005, Working paper, 2005)
      The course MAR212 Marine floristics and faunistics is compulsory for master students of the Master's Programme in Marine Biology - Marine Biodiversity, at the University of Bergen. It is offered as a field course during ...