Blar i NIVA Open Access Archive på forfatter "Lydersen, Espen"
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An In Situ Experimental Study of Effects on Submerged Vegetation After Activated Carbon Amendment of Legacy Contaminated Sediments
Olsen, Marianne; Moy, Frithjof E; Mjelde, Marit; Lydersen, Espen (Journal article; Peer reviewed, 2018)Activated carbon (AC) amendment has been shown to reduce bioavailability of hydrophobic contaminants in the bioactive layer of sediment. Unwanted secondary effects of AC amendment could be particularly undesirable for ... -
Environmental factors influencing mercury speciation in Subarctic and Boreal lakes
Braaten, Hans Fredrik Veiteberg; de Wit, Heleen; Fjeld, Eirik; Rognerud, Sigurd; Lydersen, Espen; Larssen, Thorjørn (Journal article; Peer reviewed, 2014)Environmental drivers of total mercury (TotHg) concentrations, methylmercury (MeHg) concentrations, and MeHg fractions (a proxy for methylation potential, expressed as %MeHg) were assessed in a synoptic study of 51 lakes ... -
Flensjøen i kommunene Røros og Os 2013. Status for vannkvalitet og biologiske forhold etter kalking siden 2005
Løvik, Jarl Eivind; Johnsen, Stein Ivar; Eriksen, Tor Erik; Lydersen, Espen; Dokk, John Gunnar (NIVA-rapport;6835, Research report, 2015)Rapporten omhandler vannkvalitet og biologiske forhold inklusive fisk i Flensjøen etter kalking. Innsjøens vannkvalitet viste før kalking en bedring fra 1970- og 1980-tallet og fram til 2005. Kalkingen, som startet opp i ... -
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 ... -
Mercury in the submerged macrophytes Potamogeton crispus and Chara virgate from the brackish, industrial affected Gunneklevfjorden, southern Norway
Olsen, Marianne; Sørensen, Cecilie; Lydersen, Espen (Journal article; Peer reviewed, 2016)Kvikksølv i krustjønnaks Potamogeton crispus og kransalgen Chara virgate i Gunneklevfjorden, en industripåvirket brakkvannsfjord i Norge. Total kvikksølv (Tot-Hg) og metylkvikksølv (Met-Hg) ble analysert månedlig fra mai ... -
Mikronisert Solaritt (Ca-silikat) for bruk i vassdragskalking
Lydersen, Espen; Høgberget, Rolf; Fjeld, Eirik (NIVA-rapport;7376, Research report, 2019)To typer av mikronisert solaritt (Ca2SiO4); Sol.2 og Sol.3, ble undersøkt for egnethet til bruk i vassdragskalking. Solarittene ble sammenliknet med de tradisjonelle kalkingsmidlene CaCO3 og NaOH i labforsøk for å studere ... -
Seasonal variation of mercury and δ15N in fish from Lake Heddalsvatn, southern Norway
Moreno, Clara E.; Fjeld, Eirik; Deshar, Min Kaji; Lydersen, Espen (Peer reviewed; Journal article, 2014)Seasonal variations of mercury (Hg) concentration in muscle tissue of northern pike (Esox lucius L), European whitefish (Coregonus lavaretus L) and European perch (Perca fluviatilis L) have been investigated in Lake ... -
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 (NIVA-rapport;7179, Research report, 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 ... -
The effects of wildfire on the water chemistry of dilute, acidic lakes in southern Norway
Lydersen, Espen; Høgberget, Rolf; Vicente, Clara E. Moreno; Garmo, Øyvind Aaberg; Hagen, Per Christian (Journal article; Peer reviewed, 2014)Changes in lake water chemistry were studied for >4 years following a large wildfire in a boreal forest area in Mykland, southern Norway, an area characterized by thin and patchy, base-poor and slow-weathering soils and ... -
The influence of a submerged meadow on uptake and trophic transfer of legacy mercury from contaminated sediment in the food web in a brackish Norwegian fjord
Olsen, Marianne; Fjeld, Eirik; Lydersen, Espen (Journal article; Peer reviewed, 2019)There are contradicting results on the importance of legacy mercury (Hg) contaminated sediments to Hg fish tissue concentrations. Still, sediment remediation actions often aim at minimizing ecosystem exposure and human ... -
The influence of permanently submerged macrophytes on sediment mercury distribution, mobility and methylation potential in a brackish Norwegian fjord
Olsen, Marianne; Schaanning, Morten; Braaten, Hans Fredrik Veiteberg; Eek, Espen; Moy, Frithjof Emil; Lydersen, Espen (Journal article; Peer reviewed, 2018)Macrophytes are shown to affect the microbial activity in different aqueous environments, with an altering of the sediment cycling of mercury (Hg) as a potential effect. Here, we investigated how a meadow with permanently ...