Blar i Bergen Open Research Archive på forfatter "Lennox, Robert"

Viser treff 1-9 av 9

    • Acoustic telemetry predation sensors reveal the tribulations of Atlantic salmon (Salmo salar) smolts migrating through lakes 

      Hanssen, Erlend Mjelde; Vollset, Knut Wiik; Salvanes, Anne Gro Vea; Barlaup, Bjørn; Whoriskey, Kim; Isaksen, Trond Einar; Normann, Eirik Straume; Hulbak, Magnus Andre; Lennox, Robert (Journal article; Peer reviewed, 2021)
      Smolt migration through lakes is hazardous, as the predation pressure can be extreme and the hydrology a great contrast to that of a riverine area. However, the mechanisms yielding these challenges have been scarcely ...

    • 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. ...

    • 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 ...

    • A comparative study of the alternative life history of iteroparous salmonids 

      Lennox, Robert; Nilsen, Cecilie Iden; Dahlmo, Lotte Svengård; Berhe, Saron; Barlaup, Bjørn Torgeir; Normann, Eirik; Landro, Yngve; Birnie-Gauvin, Kim; Cooke, Steven J.; Vollset, Knut (Journal article; Peer reviewed, 2024)
      The kelt phase of anadromous iteroparous salmonid life history remains mysterious, particularly aspects of their habitat use and factors influencing survival. Atlantic salmon and sea-run brown trout were captured in the ...

    • 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 ...

    • Positioning aquatic animals with acoustic transmitters 

      Lennox, Robert; Aarestrup, Kim; Alós, Josep; Arlinghaus, Robert; Aspillaga, Eneko; Bertram, Michael G.; Birnie-Gauvin, Kim; Brodin, Tomas; Cooke, Steven J.; Dahlmo, Lotte Svengård; Dhellemmes, Félicie; Gjelland, Karl Øystein; Hellström, Gustav; Hershey, Henry; Holbrook, Christopher; Klefoth, Thomas; Lowerre-Barbieri, Susan; Monk, Christopher T.; Nilsen, Cecilie Iden; Pauwels, Ine; Pickholtz, Renanel; Prchalová, Marie; Reubens, Jan; Říha, Milan; Villegas-Ríos, David; Vollset, Knut; Westrelin, Samuel; Baktoft, Henrik (Journal article; Peer reviewed, 2023)
      Geolocating aquatic animals with acoustic tags has been ongoing for decades, relying on the detection of acoustic signals at multiple receivers with known positions to calculate a 2D or 3D position, and ultimately recreate ...

    • Validating timing of salmon smolt runs obtained by telemetry studies 

      Hulbak, Magnus Andre; Hanssen, Erlend Mjelde; Lennox, Robert; Salvanes, Anne Gro Vea; Barlaup, Bjørn Torgeir; Gharbi, Naouel; Nilsen, Tom Ole; Vollset, Knut (Journal article; Peer reviewed, 2021)
      Telemetry tags are increasingly used in management to monitor the migration timing of Atlantic salmon smolts (Salmo salar L.). It has been postulated that (1) effects from tagging and handling may alter migration behaviour, ...

    • 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 ...