Blar i Scientific publications på forfatter "Rognerud, Sigurd"
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Arctic charr (Salvelinus alpinus ) squeezed in a complex fish community
Sandlund, Odd Terje; Haugerud, Eivind; Rognerud, Sigurd; Borgstrøm, Reidar (Journal article; Peer reviewed, 2013)In the complex fish community of Lake Skasen, southeastern Norway, the relative population density, habitat use and diet of Arctic charr, perch, roach and burbot was studied by a gill net survey during June-September 2010. ... -
Climatic effects on a cold stenotherm species Lepidurus arcticus (Branchiopoda, Notostraca) on the southern outreach of its distribution range
Qvenild, Tore; Fjeld, Eirik; Fjellheim, Arne; Rognerud, Sigurd; Tysse, Åsmund (Journal article; Peer reviewed, 2018)On the Norwegian mainland, the Arctic tadpole shrimp Lepidurus arcticus is a typically alpine species mainly co-occurring with fish. The Hardangervidda mountain plateau is the main area of the southernmost L. arcticus ... -
Emerging investigator series: geochemistry of trace elements associated with Fe and Mn nodules in the sediment of limed boreal lakes
Couture, Raoul-Marie; Hindar, Atle; Rognerud, Sigurd (Journal article; Peer reviewed, 2018)Thousands of boreal lakes were limed for decades in Scandinavia to counteract the effect of anthropogenic acidification. We measured the concentrations of alkali earth metals (Ca, Mg, Ba), metals (Mn, Fe, Al, Co, Cd, Pb, ... -
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 ... -
Introduced European minnow Phoxinus phoxinus in alpine lakes may increase total mercury concentration in brown trout Salmo trutta
Borgstrøm, Reidar; Rognerud, Sigurd; Meland, Sondre; Rosseland, Bjørn Olav (Peer reviewed; Journal article, 2021)In Norway, the cyprinid European minnow Phoxinus phoxinus has been spread far outside its previous natural distribution area, with lots of establishments in mountain lakes where brown trout Salmo trutta originally was the ... -
Introduced European smelt (Osmerus eperlanus) affects food web and fish community in a large Norwegian lake
Eloranta, Antti; Johnsen, Stein Ivar; Power, Michael; Bærum, Kim Magnus; Sandlund, Odd Terje; Finstad, Anders Gravbrøt; Rognerud, Sigurd; Museth, Jon (Journal article; Peer reviewed, 2018)Invasive and introduced fishes can affect recipient ecosystems and native species via altered competitive and predatory interactions, potentially leading to top-down and bottom-up cascading impacts. Here, we describe a ... -
Mass aggregations of Bibio pomonae (Insecta: Diptera: Bibionidae), an indication of climate change?
Qvenild, Tore; Rognerud, Sigurd (Journal article; Peer reviewed, 2017)Examination of stomach contents of the brown trout is a sensitive method to evaluate the animals occurring in a lake and its surroundings. Yearly test fishing from Lake Sandvatn at the Hardangervidda Mountain plateau in ... -
Screening for Stockholm Convention persistent organic pollutants in the Bosna River (Bosnia and Herzogovina)
Harman, Christopher Peter; Grung, Merete; Djedjibegovic, Jasmina; Marjanovic, Aleksandra; Sober, Miroslav; Sinanovic, Kemo; Fjeld, Eirik; Rognerud, Sigurd; Ranneklev, Sissel Brit; Larssen, Thorjørn (Journal article; Peer reviewed, 2013)The Stockholm Convention, which aspires to manage persistent organic pollutants (POPs) at the international level, was recently ratified in Bosnia and Herzegovina (BiH). Despite this fact, there is in general a paucity of ... -
Seasonal and year-to-year variation of mercury concentration in perch (Perca fluviatilis) in boreal lakes
Braaten, Hans Fredrik Veiteberg; Fjeld, Eirik; Rognerud, Sigurd; Lund, Espen; Larssen, Thorjørn (Journal article; Peer reviewed, 2014)The authors examined the seasonal and year‐to‐year variations of mercury (Hg) concentrations in populations of perch (Perca fluviatilis) from 2 boreal freshwater lakes in southeast Norway. Fish Hg concentrations were ...