Blar i forfatter "Christensen, Guttorm"

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    • Havbruksnæringens konsekvenser for økosystemtjenester og samfunn i nordområdene. Forprosjekt Balsfjorden 

      Sæther, Bjørn-Steinar; Solås, Ann-Magnhild; Robertsen, Roy; Andreassen, Otto; Dahl-Hansen, Geir; Christensen, Guttorm; Pedersen, Torstein; Uglem, Ingebrigt; Bremseth, Gunnbjørn; Gjelland, Karl Øystein (Research report; Forskningsrapport, 2017)
      Utviklingen av havbruksnæringen styres etter prinsippet om bærekraftig utvikling; sosial, økonomisk og miljømessig. Forvaltningen trenger mer kunnskap om hvilke effekter merdbasert havbruk har på økosystemtjenester og samfunn. Balsfjorden gir en unik mulighet til å studere hvordan anleggsetablering påvirker miljø og samfunn, der status for systemet i stor grad er kjent før etablering, og det kan ...

    • Health and environmental impacts in the Norwegian border area related to local Russian industrial emissions. Knowledge status. 

      Sandanger, Torkjel Manning; Anda, Erik Eik; Berglen, Tore Flatlandsmo; Evenset, Anita; Christensen, Guttorm; Heimstad, Eldbjørg Sofie (Research report; Forskningsrapport, 2013)
      The contaminant situation in the Norwegian-Russian border has caused concern for several decades and considerable amount of data has been gathered during the Pasvik programme (Stebel et al., 2007; Pasvik programme, 2008) for the environmental pollution, but not in this extent for food safety and potential human health risks in this region. Through the compiling of the available literature the ...

    • 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; Tidsskriftartikkel; Peer reviewed, 2019-01-14)
      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 > perch ≫ brown trout > roach ≈ Arctic charr) from 3132 lakes across Sweden, Finland, Norway, and Russian Murmansk area. 74% of the lakes did not meet the 0.5 ppm limit to protect ...

    • 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 (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-04-26)
      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 food webs. Here, we present concentrations of selected POPs in zooplankton (spatially and seasonally), as well as zoobenthos and sculpin (spatially) from Isfjorden, Svalbard. ...

    • Marine diets of anadromous Arctic char (Salvelinus alpinus) and pink salmon (Oncorhynchus gorbuscha) in Svalbard, Norway 

      Bengtsson, Oskar; Lydersen, Christian; Christensen, Guttorm; Węsławski, Jan Marcin; Kovacs, Kit M. (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-09-22)
      During summer, native anadromous Arctic char (Salvelinus alpinus) and the alien species pink salmon (Oncorhynchus gorbuscha) now coexist in marine environments in Svalbard, following the introduction of the latter in the Barents Region. To investigate potential dietary competition between these two salmonid species, stomach contents from Arctic char (n=301) and pink salmon (n=28) were sampled from ...

    • 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 (Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-29)
      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 and thawing permafrost may serve as a secondary source of these stored POPs to freshwater and marine ecosystems. Here, we present concentrations and composition of legacy POPs in ...

    • Spatial and temporal trends of mercury in freshwater fish in Fennoscandia (1965-2015) 

      Braaten, Hans Fredrik Veiteberg; Åkerblom, Staffan; de Wit, Heleen; Skotte, Gunnar; Rask, Martti; Vuorenmaa, Jussi; Kahilainen, Kimmo K.; Malinen, Tommi; Rognerud, Sigurd; Lydersen, Espen; Amundsen, Per-Arne; Kashulin, Nicholas; Kashulina, Tatiana; Terentyev, Petr; Christensen, Guttorm; Jackson-Blake, Leah Amber; Lund, Espen; Rosseland, Bjørn Olav (Research report; Forskningsrapport, 2017-09)
      Mercury (Hg) emissions to the atmosphere cause elevated Hg levels in fish, even in many remote regions of the world. Here we present an extensive database of more than 50 000 measurements of Hg in fish, including 2 775 individual water bodies in Fennoscandia (Norway, Sweden, Finland, Russian part of Kola Peninsula) sampled between 1965 and 2015. The data have been analysed for spatial patterns and ...