Blar i NIVA Open Access Archive på forfatter "Gundersen, Hege"
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Shifts between sugar kelp and turf algae in Norway: regime shifts or flips between different opportunistic seaweed species?
Christie, Hartvig C; Andersen, Guri Sogn; Bekkby, Trine; Fagerli, Camilla With; Gitmark, Janne Kim; Gundersen, Hege; Rinde, Eli (Journal article; Peer reviewed, 2019)Around year 2000, sugar kelp (Saccharina latissima) forests were observed to disappear in southern parts of Norway, being replaced by mats of turf algae (i.e. filamentous ephemeral algae) loaded with sediments. About 80% ... -
Soft bottom benthos and responses to climate variation and eutrophication in Skagerrak
Trannum, Hilde Cecilie; Gundersen, Hege; Oug, Eivind; Rygg, Brage; Norderhaug, Kjell Magnus (Journal article; Peer reviewed, 2018)Skagerrak has been subject to several anthropogenic influences over the past decades, with climate change and eutrophication being considered as the most serious and large-scale disturbance factors. The present study reports ... -
Stortareskog som indikator i «Naturindeks for Norge»
Christie, Hartvig; Gundersen, Hege; Rinde, Eli; Bekkby, Trine (NIVA-rapport;6609, Research report, 2014)Naturindeksens indikatorverdi for stortare har til nå blitt rapportert som prosentandelen av artens (naturtypens) utbredelse innen et gitt område som er antatt å ha naturtilstand. Vårt mål i dette utviklingsprosjektet har ... -
Sukkertarens naturlige utbredelse – modellering av referansetilstand for Norsk naturindeks
Gundersen, Hege; Bekkby, Trine (Journal article; Peer reviewed, 2013)Sukkertare (Saccharina latissima) er en viktig indikatorart i Norsk naturindeks, en indeks som skal måle utviklingen av biologisk mangfold i Norge. Dagens indikator er en semi-kvantitativ indeks basert på ekspertvurdering ... -
Tallknusing av sukkertaredata
Gundersen, Hege; Norderhaug, Kjell Magnus; Christie, Hartvig C; Moy, Frithjof Emil; Hjermann, Dag Øystein; Vedal, Jens; Ledang, Anna Birgitta; Gitmark, Janne Kim; Walday, Mats (NIVA-rapport;6737, Research report, 2014)Norsk institutt for vannforskning (NIVA) og Havforskningsinstituttet (HI) har gjennomført prosjektet «Tallknusing av sukkertare-data», på oppdrag fra Miljødirektoratet. Gjennom prosjektet har tilgjengelige data som kan ... -
The abundance of kelp is modified by the combined impact of depth, waves and currents
Bekkby, Trine; Smit, Cecilie; Gundersen, Hege; Rinde, Eli; Steen, Henning; Tveiten, Lise Ann; Gitmark, Janne Kim; Fredriksen, Stein; Albretsen, Jon; Christie, Hartvig C (Journal article; Peer reviewed, 2019)This study analyses the combined impact of two types of ocean water flow, wave exposure and ocean currents, on kelp Laminaria hyperborea abundance, taking other environmental co-variables into account. The dataset covers ... -
The influence of physical factors on kelp and sea urchin distribution in previously and still grazed areas in the NE Atlantic
Rinde, Eli; Christie, Hartvig; Fagerli, Camilla W.; Bekkby, Trine; Gundersen, Hege; Norderhaug, Kjell Magnus; Hjermann, Dag Ø. (Journal article; Peer reviewed, 2014)The spatial distribution of kelp (Laminaria hyperborea) and sea urchins (Strongylocentrotus droebachiensis) in the NE Atlantic are highly related to physical factors and to temporal changes in temperature. On a large scale, ... -
The kelp cultivation potential in coastal and offshore regions of Norway
Broch, Ole Jacob; Alver, Morten; Bekkby, Trine; Gundersen, Hege; Forbord, Silje; Handå, Aleksander; Skjermo, Jorunn; Hancke, Kasper (Journal article; Peer reviewed, 2019)We have evaluated the cultivation potential of sugar kelp (Saccharina latissima) as a function of latitude and position (near- and offshore) along the Norwegian coast using a coupled 3D hydrodynamic-biogeochemical-kelp ... -
Variation in population structure and standing stocks of kelp along multiple environmental gradients and implications for ecosystem services
Gundersen, Hege; Rinde, Eli; Bekkby, Trine; Hancke, Kasper; Gitmark, Janne K; Christie, Hartvig (Peer reviewed; Journal article, 2021)There is an increasing focus on ecosystem services provided by macroalgae worldwide, many which depend on its structural and morphological characteristics. Here we investigated how characteristics of canopy kelp plants of ...