Browsing Bergen Open Research Archive by Author "Velle, Gaute"

Now showing items 1-20 of 20

    • Acute effects of gas supersaturation on Atlantic salmon smolt in two Norwegian rivers 

      Stenberg, Sondre Kvalsvik; Velle, Gaute; Pulg, Ulrich; Skoglund, Helge (Journal article; Peer reviewed, 2020)
      Total dissolved gas (TDG) supersaturation downstream of hydropower plants may cause gas bubble disease (GBD) and harmful effects in fish. Little is known about tolerance levels of TDG supersaturation on Atlantic salmon ...

    • Assessing acidity impacts in Nordic lakes and streams: Development of a macroinvertebrate-based multimetric index to quantify degradation and recovery 

      Carlson, Peter E.; Johnson, Richard K.; Aroviita, Jukka; Velle, Gaute; Fölster, Jens (Journal article; Peer reviewed, 2023)
      1) Emissions of acidifying compounds have decreased over several decades, nevertheless acidification impacts on aquatic ecosystems remains as a regionally important environmental driver resulting in biodiversity loss and ...

    • Assessing the potential for gas supersaturation downstream of hydropower plants in Norway, Austria and Germany 

      Pulg, Ulrich; Lennox, Robert; Enqvist, Martin; Stranzl, Sebastian Franz; Espedal, Espen Olsen; Schwarz, Michael; Lorke, Andreas; Flödl, Peter; Hauer, Christoph; Schletterer, Martin; Halleraker, Jo Halvard; Velle, Gaute (Journal article; Peer reviewed, 2024)
      Hydroelectric power facilities can generate episodic total dissolved gas supersaturation (TDGS), which is harmful to aquatic life. We developed a decision tree-based risk assessment to identify the potential for TDGS at ...

    • Behaviour of anadromous brown trout (Salmo trutta) in a hydropower regulated freshwater system 

      Dahlmo, Lotte Svengård; Velle, Gaute; Nilsen, Cecilie Iden; Pulg, Ulrich; Lennox, Robert; Vollset, Knut (Journal article; Peer reviewed, 2023)
      Many Norwegian rivers and lakes are regulated for hydropower, which afects freshwater ecosystems and anadromous fish species, such as sea trout (Salmo trutta). Lakes are an important feature of many anadromous river systems. ...

    • Behavioural response of brown trout (Salmo trutta) to total dissolved gas supersaturation in a regulated river 

      Lennox, Robert J.; Thiemer, Kirstine; Vollset, Knut Wiik; Pulg, Ulrich; Stranzl, Sebastian; Nilsen, Cecilie Iden; Haugen, Thrond Oddvar; Velle, Gaute (Journal article; Peer reviewed, 2022)
      Total dissolved gas supersaturation from dams and power stations is a chronic freshwater pollutant that is toxic to animals with aquatic respiration. Laboratory ecotoxicology experiments have revealed capacity for captive ...

    • bioCEED Survey 2015 

      Hole, Torstein Nielsen; Jeno, Lucas Matias; Holtermann, Kristin; Raaheim, Arild; Velle, Gaute; Simonelli, Anne Laure; Vandvik, Vigdis (Research report, 2016-04)
      The bioCEED Survey 2015 is a baseline study of major tertiary-level biology education in Norway. The survey addresses themes such as learning in practice, transferable skills, motivation, laboratory and field learning, ...

    • Biology students at work: using blogs to investigate personal epistemologies 

      Hole, Torstein Nielsen; Velle, Gaute; Riese, Hanne; Raaheim, Arild; Simonelli, Anne-Laure (Peer reviewed; Journal article, 2018-12-24)
      This paper reports an investigation of biology students’ discussion of knowing in work placements, as accounted in blogs. Twenty-two blogs, containing 78 individual entries, written in conjunction with a work placement ...

    • Bubbling trouble: Effects of supersaturated water on benthic macroinvertebrates 

      Velle, Gaute; Isaksen, Trond Einar; Lennox, Robert; Pulg, Ulrich (Journal article; Peer reviewed, 2024)
      The saturation of total dissolved gases (TDG) in water remains around 100%. Certain circumstances can lead to TDG values exceeding 100%, resulting in TDG supersaturation (TDGS). TDGS above about 110% can be toxic to animals ...

    • Effects of nuisance submerged vegetation on the fauna in Norwegian rivers 

      Velle, Gaute; Skoglund, Helge; Barlaup, Bjørn Torgeir (Journal article; Peer reviewed, 2021)
      The abundance of aquatic vegetation is increasing in rivers and lakes worldwide. The aim of this study was to find how the macrophyte Juncus bulbosus Linnaeus affects salmonids and benthic macroinvertebrates in Norwegian ...

    • Effects of within-lake variability of fossil assemblages on quantitative chironomid-inferred temperature reconstruction 

      Heiri, Oliver; Birks, Harry John Betteley; Brooks, Stephen J.; Velle, Gaute; Willassen, Endre (Peer reviewed; Journal article, 2003)
      We studied the effects of within-lake variation of subfossil chironomid assemblages on chironomid-inferred temperatures in five lakes in southern Norway. In each lake six replicate surface-sediment samples in the deepest ...

    • A global-scale screening of non-native aquatic organisms to identify potentially invasive species under current and future climate conditions 

      Vilizzi, Lorenzo; Copp, Gordon H.; Hill, Jeffrey E.; Adamovich, Boris; Aislabie, Luke; Akin, Daniel; Al-Faisal, Abbas J.; Almeida, David; Azmai, M. N. Amal; Bakiu, Rigers; Bellati, Adriana; Bernier, Renee; Bies, Jason M.; Bilge, Gokcen; Branco, Paulo; Bui, , Thuyet D.; Canning-Clode, João; Cardoso Ramos, Henrique Anatole; Castellanos-Galindo, Gustavo A.; Castro, Nuno; Chaichana, Ratcha; Chainho, Paula; Chan, Joleen; Cunico, Almir M.; Curd, Amelia; Dangchana, Punyanuch; Dashinov, Dimitriy; Davison, Phil I.; de Camargo, Mariele P.; Dodd, Jennifer A.; Donahou, Allison L. Durland; Edsman, Lennart; Ekmekci, F. Guler; Elphinstone-Davis, Jessica; Erös, Tibor; Evangelista, Charlotte; Fenwick, Gemma; Ferincz, Arpad; Ferreira, Teresa; Feunteun, Eric; Filiz, Halit; Forneck, Sandra C.; Gajduchenko, Helen S.; Monteiro, Joao Gama; Gestoso, Ignacio; Giannetto, Daniela; Gilles, Allan S.; Gizzi, Francesca; Glamuzina, Branko; Glamuzina, Luka; Goldsmit, Jesica; Gollasch, Stephan; Goulletquer, Philippe; Grabowska, Joanna; Harmer, Rogan; Haubrock, Phillip J.; Hean, Jeffrey W.; Jelmert, Anders; Johnsen, Stein Ivar; Malmstrøm, Martin; Velle, Gaute (Journal article; Peer reviewed, 2021)
      The threat posed by invasive non-native species worldwide requires a global approach to identify which introduced species are likely to pose an elevated risk of impact to native species and ecosystems. To inform policy, ...

    • Impacts of predation by Eurasian otters on Atlantic salmon in two Norwegian rivers 

      Sortland, Lene; Lennox, Robert; Velle, Gaute; Vollset, Knut; Kambestad, Marius (Journal article; Peer reviewed, 2023)
      1. The return of the Eurasian otter (Lutra lutra) to western Norway has sparked human–predator conflicts because otters prey on vulnerable Atlantic salmon (Salmo salar) populations. Although predation may not be the ultimate ...

    • Late Quaternary chironomid community structure shaped by rate and magnitude of climate change 

      Mayfield, Roseanna J.; Langdon, Peter G.; Doncaster, C. Patrick; Dearing, John A.; Wang, Rong; Velle, Gaute; Davies, Kimberley L.; Brooks, Stephen J. (Journal article; Peer reviewed, 2021)
      Much is known about how climate change impacts ecosystem richness and turnover, but we have less understanding of its influence on ecosystem structures. Here, we use ecological metrics (beta diversity, compositional disorder ...

    • Learning and personal epistemologies among students in three work placement settings 

      Hole, Torstein Nielsen; Velle, Gaute; Helleve, Ingrid; Ulvik, Marit; Sætre, Jon Helge; Brøske, Brit Ågot; Raaheim, Arild (Journal article; Peer reviewed, 2021)
      Recent development in policy and learning theory encourages higher education institutions to send their students out of campus and into work placements. In this paper, we report on students’ engagement with various aspects ...

    • Light and temperature controls of aquatic plant photosynthesis downstream of a hydropower plant and the effect of plant removal 

      Demars, Benoît Olivier Laurent; Schneider, Susanne Claudia; Thiemer, Kirstine; Dörsch, Peter; Pulg, Ulrich; Stranzl, Sebastian Franz; Velle, Gaute; Pathak, Devanshi (Journal article; Peer reviewed, 2023)
      Many rivers worldwide are regulated, and the altered hydrology can lead to mass development of aquatic plants. Plant invasions are often seen as a nuisance for human activities leading to costly remedial actions with ...

    • Long-term responses of benthic invertebrates to rotenone treatment 

      Kjærstad, Gaute; Arnekleiv, Jo Vegar; Velle, Gaute; Finstad, Anders Gravbrøt (Journal article; Peer reviewed, 2021)
      Biological invasions are regarded as one of the largest threats to native biodiversity. The eradication of alien invasive fish or parasites by culling of hosts is a controversial conservation strategy, particularly when ...

    • Motivational Determinants of Students’ Academic Functioning: The Role of Autonomy-support, Autonomous Motivation, and Perceived Competence 

      Jeno, Lucas Matias; Nyléhn, Jorun; Hole, Torstein N.; Raaheim, Arild; Velle, Gaute; Vandvik, Vigdis (Journal article; Peer reviewed, 2021)
      Inadequate academic functioning among students might be a main cause of the considerable dropout rates, and well-being and achievement problems in higher education. Few studies address the role of motivation for academic ...

    • Palaeolimnological and sedimentary responses to Holocene forest retreat in the Scandes Mountains, west-central Sweden 

      Hammarlund, Dan; Velle, Gaute; Wolfe, Brent B.; Edwards, Thomas W. D.; Barnekow, Lena; Bergman, Jonas; Holmgren, Sofia; Lamme, Sara; Snowball, Ian; Wohlfart, Barbara; Possnert, Göran (Peer reviewed; Journal article, 2004)
      A suite of analyses was performed on sediments accumulated during the last 10 700 years in Lake Spaime, a small, hydrologically open water body in the modem alpine tundra zone of the Scandes Mountains, west-central Sweden. ...

    • Rapid Landscape Changes in Plastic Bays Along the Norwegian Coastline 

      Bastesen, Eivind; Haave, Marte; Andersen, Gidske Leknæs; Velle, Gaute; Bødtker, Gunhild; Krafft, Charlotte Gannefors (Journal article; Peer reviewed, 2021)
      The Norwegian Coastal Current transports natural debris and plastic waste along the Norwegian coastline. Deposition occurs in so-called wreck-bays and includes floating debris, such as seaweed, driftwood and volcanic pumice, ...

    • Validity of winter sampling for estimation of salmonid abundance by electrofishing 

      Kambestad, Marius; Hellen, Bjart Are; Lennox, Robert; Velle, Gaute; Sægrov, Harald (Journal article; Peer reviewed, 2024)
      Electrofishing removal sampling is a common method for abundance estimation of juvenile salmonids in streams and is usually performed during autumn. European guidelines specify that sampling should be conducted at water ...