Browsing NIVA Open Access Archive by Author "Christensen, Guttorm"

Now showing items 1-20 of 22

    • Contaminants in coastal waters 2022 

      Schøyen, Merete; Grung, Merete; Lund, Espen; Hjermann, Dag Øystein; Ruus, Anders; Øxnevad, Sigurd; Christensen, Guttorm; Beylich, Bjørnar; Jenssen, Marthe Torunn Solhaug; Tveiten, Lise Ann; Håvardstun, Jarle; Eftevåg, Veronica Sæther; Bæk, Kine (NIVA-rapport;7912-2023, Research report, 2024)
      The Norwegian environmental monitoring programme “Contaminants in coastal waters” (Miljøgifter i kystområdene - MILKYS) examines the levels, trends, and effects of contaminants annually in biota along the Norwegian fjords ...

    • Detection of tris(2,3-dibromopropyl) phosphate and other organophosphorous compounds in Arctic rivers 

      Allan, Ian J; Garmo, Øyvind A; Rundberget, Jan Thomas; Terentjev, Petr; Christensen, Guttorm; Kashulin, Nikolay A (Journal article; Peer reviewed, 2018)
      The flame-retardant tris(2,3-dibromopropyl) phosphate (TDBrPP) was in the 1970s banned for uses in textiles that may be in contact with the skin, owing to strong suspicions that the substance was a human carcinogen. The ...

    • Evaluering av ØKOKYST - stasjonsnett og klassegrenser 

      Walday, Mats Gunnar; Fagerli, Camilla With; Frigstad, Helene; Staalstrøm, Andre; Kaurin, Maria; Christensen, Guttorm; Trannum, Hilde Cecilie; Eikrem, Wenche (NIVA-rapport;7527, Research report, 2020)
      Overvåkingsprogrammet "Økosystemovervåking i Kystvann – ØKOKYST" har til hensikt å overvåke miljøtilstanden i utvalgte områder langs norskekysten i henhold til vannforskriften. Miljødirektoratet har bedt NIVA gjennomgå ...

    • Fine-scale behavioural differences distinguish resource use by ecomorphs in a closed ecosystem 

      Hawley, Kate L.; Rosten, Carolyn M.; Christensen, Guttorm; Lucas, Martyn C. (Journal article; Peer reviewed, 2016)
      Temporal differences in habitat use and foraging specialisms between ecomorphs represent aspects of behavioural phenotype that are poorly understood with regard to the origin and maintenance of ecological diversity. We ...

    • Forhold for overlevelse av Gyrodactylus salaris i Oslofjorden 

      Staalstrøm, Andre; Christensen, Guttorm; Haugen, Thrond Oddvar (NIVA-rapport;7814-2023, Research report, 2023)
      I denne rapporten har modellkjøringer med FjordOs-modellen blitt kalibrert mot målinger av saltholdighet i overflatelaget i Oslofjorden. Disse modellresultatene er brukt for å vurdere muligheten for at vandrende laks kan ...

    • The impact of the spring 2020 snowmelt floods on physicochemical conditions in three Norwegian river-fjord-coastal systems 

      Poste, Amanda; Kaste, Øyvind; Frigstad, Helene; de Wit, Heleen; Harvey, Therese; Valestrand, Louise; Deininger, Anne; Bryntesen, Tina; Delpech, Lisa-Marie; Christensen, Guttorm (NIVA-rapport;7651, Research report, 2021)
      Due to very high snow accumulation in the winter of 2019/2020, the Norwegian Water Resources and Energy Directorate (NVE) in late May 2020 issued flood forecasts predicting extremely high flood risk for parts of northern ...

    • Improved Environmental Status: 50 Years of Declining Fish Mercury Levels in Boreal and Subarctic Fennoscandia 

      Braaten, Hans Fredrik Veiteberg; Åkerblom, Staffan; Kahilainen, Kimmo Kalevi; Rask, Martti; Vuorenmaa, Jussi; Mannio, Jaakko; Malinen, Tommi; Lydersen, Espen; Poste, Amanda; Amundsen, Per-Arne; Kashulin, Nikolai; Kashulina, Tatiana; Terentjev, Petr; Christensen, Guttorm; de Wit, Heleen (Journal article; Peer reviewed, 2019)
      Temporally (1965–2015) and spatially (55°–70°N) extensive records of total mercury (Hg) in freshwater fish showed consistent declines in boreal and subarctic Fennoscandia. The database contains 54 560 fish entries (n: pike ...

    • Influence of Riverine Input on Norwegian Coastal Systems 

      Frigstad, Helene; Kaste, Øyvind; Deininger, Anne; Kvalsund, Karsten; Christensen, Guttorm; Bellerby, Richard; Sørensen, Kai; Norli, Marit; King, Andrew Luke (Peer reviewed; Journal article, 2020)
      Coastal ecosystems are of high ecological and socioeconomic importance and are strongly influenced by processes from land, sea, and human activities. In this study, we present physical, chemical, and biological observations ...

    • Is Glacial Meltwater a Secondary Source of Legacy Contaminants to Arctic Coastal Food Webs? 

      Mcgovern, Maeve; Warner, Nicholas Alexander; Borgå, Katrine; Evenset, Anita; Carlsson, Pernilla Marianne; Skogsberg, Stina Linnea Emelie; Søreide, Janne; Ruus, Anders; Christensen, Guttorm; Poste, Amanda (Peer reviewed; Journal article, 2022)
      Climate change-driven increases in air and sea temperatures are rapidly thawing the Arctic cryosphere with potential for remobilization and accumulation of legacy persistent organic pollutants (POPs) in adjacent coastal ...

    • Is Glacial Meltwater a Secondary Source of Legacy Contaminants to Arctic Coastal Food Webs? 

      Mcgovern, Maeve; Warner, Nicholas Alexander; Borgå, Katrine; Evenset, Anita; Carlsson, Pernilla Marianne; Skogsberg, Stina Linnea Emelie; Søreide, Janne; Ruus, Anders; Christensen, Guttorm; Poste, Amanda (Peer reviewed; Journal article, 2022)
      Climate change-driven increases in air and sea temperatures are rapidly thawing the Arctic cryosphere with potential for remobilization and accumulation of legacy persistent organic pollutants (POPs) in adjacent coastal ...

    • Mercury Risk Evaluation, Risk Management and Risk Reduction Measures in the Arctic (ARCRISK) – Inception Report 

      Gundersen, Cathrine Brecke; Braaten, Hans Fredrik Veiteberg; Steindal, Eirik Hovland; Moe, S. Jannicke; Yakushev, Evgeniy; Christensen, Guttorm; Kirk, Jane; Hintelmann, Holger; Frolova, Natalia; Terentjev, Petr; Roberts, Sarah (NIVA-rapport;7489, Research report, 2020)
      The project “Risk evaluation, risk reduction and risk management action plans for mercury in the Arctic – a circumpolar management approach” (ARCRISK) has been developed to address mercury pollution in the Arctic. The main ...

    • Miljøovervåking av kvikksølv i abbor, 2010. Environmental survey of mercury in perch, 2010 

      Fjeld, E.; Rognerud, S.; Christensen, Guttorm; Dahl-Hansen, Geir; Braaten, H. (NIVA-rapport;6090, Research report, 2010)
      Konsentrasjonen av kvikksølv ble undersøkt i fem bestander av abbor, innfanget høsten 2010. For tre bestander i Øst-Norge hadde konsentrasjonene i gjennomsnitt økt med 27 % sammenliknet med nivåene i 1990/1991. Nivåene var ...

    • Miniaturization of a transthyretin binding assay using a fluorescent probe for high throughput screening of thyroid hormone disruption in environmental samples 

      Ouyang, Xiyu; Froment, Jean Francois; Leonards, Pim E.G.; Christensen, Guttorm; Tollefsen, Knut Erik; de Boer, Jacob; Thomas, Kevin V; Lamoree, Marja H. (Journal article; Peer reviewed, 2017)
      Thyroid hormone (TH) disrupting compounds are potentially important environmental contaminants due to their possible adverse neurological and developmental effects on both humans and wildlife. Currently, the most successful ...

    • Overvåking og kartlegging av fremmed ferskvannsfisk og vasspest ved bruk av miljø-DNA 

      Engesmo, Anette; Kistenich, Sonja; Knudsen, Steen Wilhelm; Christensen, Guttorm; Hesselsøe, Martin; Anglès d'Auriac, Marc (NIVA-rapport;7623, Research report, 2021)
      Tidligere publiserte molekylære deteksjonssystemer for fem invaderende fiskearter (pukkellaks, gjedde, ørekyt, sørv og suter) ble evaluert i henhold til Thalingers valideringsskala. Deretter ble det samlet miljø-DNA prøver ...

    • Overvåking og kartlegging av fremmed ferskvannsfisk ved bruk av miljø-DNA 

      Engesmo, Anette; Knudsen, Steen Wilhelm; Christensen, Guttorm; Hesselsøe, Martin; Anglès d'Auriac, Marc (NIVA-rapport;7435, Research report, 2019)
      Dette prosjektet er gjennomført på oppdrag fra Miljødirektoratet og målsetningen var å utvikle og teste ut et system for bruk av miljø-DNA som supplerende verktøy i overvåkning og kartlegging av fremmed ferskvannsfisk for ...

    • Overvåking og kartlegging av fremmed ferskvannsfisk ved bruk av miljø-DNA 2021 

      Engesmo, Anette; Egge, Elianne Dunthorn; Knudsen, Steen Wilhelm; Christensen, Guttorm; Hesselsøe, Martin; Anglès d'Auriac, Marc (NIVA-rapport;7732-2022, Research report, 2022)
      Det ble samlet miljø-DNA prøver fra Akersvannet og Virikbekken som ble analysert for gjedde og ørret. Resultatene viste et forutsigbart mønster i Virikbekken, med størst konsentrasjon av gjedde DNA øverst og størst ...

    • Passive air and water sampling at Andøya, Bjørnøya and Jan Mayen 

      Allan, Ian; Aas, Wenche; Langford, Katherine; Christensen, Guttorm; Green, Norman W.; Breivik, Knut; Bæk, Kine; Ranneklev, Sissel (NIVA-rapport;6366, Research report, 2012)
      As part of the monitoring programme established by the Norwegian Climate and Pollution Directorate (Klif) to assess fluxes of contaminants in the Barents Sea, Norwegian Sea and North Sea, passive sampling was undertaken ...

    • Passive sampling and benchmarking to rank HOC levels in the aquatic environment 

      Allan, Ian John; Vrana, Branislav; de Weert, Jasperien; Kringstad, Alfhild; Ruus, Anders; Christensen, Guttorm; Terentjev, Petr; Green, Norman Whitaker (Peer reviewed; Journal article, 2021)
      The identification and prioritisation of water bodies presenting elevated levels of anthropogenic chemicals is a key aspect of environmental monitoring programmes. Albeit this is challenging owing to geographical scales, ...

    • Review and application of Russian and Norwegian methods for measuring and estimating riverine inputs of heavy metals to the Barents Sea 

      Kaste, Ø.; Allan, I.; Austnes, K.; Christensen, Guttorm; Christiansen, A.; Chultsova, Anna; Høgåsen, T.; Kashulin, Nikolay; Kashulina, Tatyana; Khomenko, Grigory; Skancke, L.; Selvik, J.; Yakushev, E. (NIVA-rapport;6617, Research report, 2014)
      This report presents the results from the Norwegian-Russian collaboration project NordRID project, which was carried out from December 2011 to December 2013. Four institutions have been involved; INEP and IO RAS from the ...

    • Small Arctic rivers transport legacy contaminants from thawing catchments to coastal areas in Kongsfjorden, Svalbard 

      Mcgovern, Maeve; Borgå, Katrine; Heimstad, Eldbjørg Sofie; Ruus, Anders; Christensen, Guttorm; Evenset, Anita (Peer reviewed; Journal article, 2022)
      Decades of atmospheric and oceanic long-range transport from lower latitudes have resulted in deposition and storage of persistent organic pollutants (POPs) in Arctic regions. With increased temperatures, melting glaciers ...