Browsing Brage NMBU by Author "Borgstrøm, Reidar"
Now showing items 1-20 of 20
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An extensive common‐garden study with domesticated and wild Atlantic salmon in the wild reveals impact on smolt production and shifts in fitness traits
Skaala, Øystein; Besnier, Francois; Borgstrøm, Reidar; Barlaup, Bjørn Torgeir; Sørvik, Anne Grete Eide; Normann, Eirik; Østebø, Britt Iren; Hansen, Michael Møller; Glover, Kevin (Journal article; Peer reviewed, 2019)Interactions between domesticated escapees and wild conspecifics represent a threat to the genetic integrity and fitness of native populations. For Atlantic salmon, the recurrent presence of large numbers of domesticated ... -
Angler impact on the Brown trout Salmo trutta population size and structure in the lake, Øvre Heimdalsvatn
Strand, Marit Knutsdatter (Master thesis, 2017)Studies of the brown trout (Salmo trutta) population in the subalpine lake, Øvre Heimdalsvatn, on the eastern slope of the Jotunheimen Mountains, have been performed since 1957 until today. The exploitation of the population ... -
Aurebestandane i Litlosvatn og Kollsvatn i Kvennavassdraget på Hardangervidda
Borgstrøm, Reidar (MINA fagrapport;28, Report, 2014)I juli 2014 vart det gjennomført eit prøvefiske i Litlosvatn, øvst i Kvennavassdraget i Ullensvang statsallmenning på vestre del av Hardangervidda, for å få innblikk i korleis bestanden har utvikla seg dei seinare åra etter ... -
Auren i Øvre Heimdalsvatn 2020
Borgstrøm, Reidar (MINA fagrapport;69, Report, 2021)Som ein lekk i å oppretthalda den lange tidsserien med innsamling av bestandsdynamiske data på aure i det subalpine Øvre Heimdalsvatn, i Øystre Slidre, har det kvart år i dei siste seks åra, inkludert 2020, vore gjennomført ... -
Catch per unit effort by repeated gillnetting; a useful method for direct estimation of brown trout abundance in small lakes
Borgstrøm, Reidar; Myrvang, Runar; Slettebø, Dag (Peer reviewed; Journal article, 2020) -
Expected Climate Change in the High Arctic—Good or Bad for Arctic Charr?
Svenning, Martin; Bjørvik, Eigil T.; Godiksen, Jane Aanestad; Hammar, Johan; Kohler, Jack; Borgstrøm, Reidar; Yoccoz, Nigel Gilles (Peer reviewed; Journal article, 2023)Lakes in the High Arctic are characterized by their low water temperature, long-term ice cover, low levels of nutrients, and low biodiversity. These conditions mean that minor climatic changes may be of great importance ... -
Habitat segregation by sympatric juvenile Arctic charr and brown trout in shallow lake areas: a consequence of interspecifc diferences in predator avoidance?
Svenning, Martin; Stien, Audun; Borgstrøm, Reidar (Peer reviewed; Journal article, 2024)In sympatry, juvenile brown trout (Salmo trutta) usually occupy the shallow and most productive areas (littoral zone) of lakes, while juveniles of Arctic charr (Salvelinus alpinus) are found in deeper, less productive ... -
Increased precision of growth data gained by reading multiple scales from each individual of Atlantic salmon (Salmo salar)
Haraldstad, Tormod; Haugen, Thrond Oddvar; Borgstrøm, Reidar; Jonsson, Bror (Journal article; Peer reviewed, 2016)The precision of growth estimates based on fish scales often remains uncertain because of withinindividual variation in scale size and scale patterns, and also due to measurement errors. Based on scale readings of Atlantic ... -
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 ... -
Kraftutbygging i Opo : miljøeffektar og alternative løysingar
Borgstrøm, Reidar (MINA fagrapport;34, Report, 2016)Opovassdraget i Odda kommune har eit nedbørfelt på 470 km2. Vassdraget har mange vidgjetne fossar, og det er på grunn av fosselandskapet og friluftsinteressene at vassdraget vart freda mot kraftutbygging i 1973. Årleg ... -
Large individuals in dense brown trout (Salmo trutta) populations: not always a paradox
Borgstrøm, Reidar (Peer reviewed; Journal article, 2022) -
Lepidurus arcticus (Crustacea : Notostraca); an unexpected prey of Arctic charr (Salvelinus alpinus) in a High Arctic river
Borgstrøm, Reidar; Aas, Morten; Hegseth, Hanne; Dempson, J. Brian; Svenning, Martin (Journal article; Peer reviewed, 2018) -
Marine organisms transported by seabirds may contribute significantly to Arctic charr diet in coastal High‑Arctic lakes
Svenning, Martin; Borgstrøm, Reidar (Peer reviewed; Journal article, 2024)The rich marine resources along the western coast of Spitsbergen (Svalbard) have given rise to colonies of breeding seabirds, which likely represent an important vector of nutrient transport from marine to terrestrial ... -
Mysis segerstralei, an unexpected but important prey for resident Arctic charr (Salvelinus alpinus) in a Svalbard lake
Svenning, Martin; Skogstad, Ole Christiam; Skogstad, Øyvind; Borgstrøm, Reidar (Peer reviewed; Journal article, 2024)Mysis segerstralei is distributed over a wide geographic area and in habitats with a variety of salinity conditions, including marine and brackish waters around Svalbard. The species has seldom been found in freshwater ... -
Mysis segerstralei, an unexpected but important prey for resident Arctic charr (Salvelinus alpinus) in a Svalbard lake
Svenning, Martin; Skogstad, Ole Christian; Skogstad, Øyvind; Borgstrøm, Reidar (Peer reviewed; Journal article, 2024)Mysis segerstralei is distributed over a wide geographic area and in habitats with a variety of salinity conditions, including marine and brackish waters around Svalbard. The species has seldom been found in freshwater ... -
Parallelism in thermal growth response in otoliths and scales of brown trout (Salmo trutta L.) from alpine lakes independent of genetic background
Thaulow, Jens; Haugen, Thrond Oddvar; Borgstrøm, Reidar (Journal article; Peer reviewed, 2017) -
Sjørøya (Salvelinus alpinus) i Linnévassdraget, Svalbard : livshistorietrekk og populasjonsstruktur ti år etter innføring av kvotebasert fangst
Bergane, Vegard Årthun (Master thesis, 2018)Populasjonsstruktur, vandringsmønster og diett hos anadrom røye (Salvelinus alpinus) i Linnévassdraget på Vest-Spitsbergen, Svalbard, vart undersøkt sommar/haust 2017. Linnévatnet dekker 4,6 km², og er eit av dei lettast ... -
The helminth fauna of brown trout (Salmo trutta) from a sub-alpine lake revisited after 40 years with introduced European minnow (Phoxinus phoxinus)
Borgstrøm, Reidar; Mestrand, Øyvind Hatleli; Brittain, John Edward; Lien, Leif (Peer reviewed; Journal article, 2021) -
Time series covering up to four decades reveals major changes and drivers of marine growth and proportion of repeat spawners in an Atlantic salmon population
Harvey, Alison C.; Skaala, Øystein; Borgstrøm, Reidar; Andersen-Fjeldheim, Per Tommy; Andersen-Fjeldheim, Kaja Christine; Utne, Kjell Rong; Johnsen, Ingrid Askeland; Fiske, Peder; Winterthun, Synnøve; Knutar, Sofie; Sægrov, Harald; Urdal, Kurt; Glover, Kevin Alan (Peer reviewed; Journal article, 2022) -
Ørekyt (Phoxinus phoxinus) i Øvre Heimdalsvatn : bestandsdynamikk og habitatbruk etter om lag femti års sameksistens med ørret (Salmo trutta)
Liberg, Mathea Sætre (Master thesis, 2018)I den subalpine innsjøen Øvre Heimdalsvatn var ørret (Salmo trutta) opprinnelig eneste fiskeart, men i 1969 ble ørekyt (Phoxinus phoxinus) oppdaget. Det har vært gjennomført omfattende studier på ørret i Øvre Heimdalsvatn ...