Browsing NORCE vitenarkiv by Author "Lennox, Robert"

Now showing items 1-20 of 29

    • 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 (Peer reviewed; Journal article, 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 (Peer reviewed; Journal article, 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 (Peer reviewed; Journal article, 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 (Peer reviewed; Journal article, 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 ...

    • Digital fisheries data in the Internet age: Emerging tools for research and monitoring using online data in recreational fisheries 

      Lennox, Robert; Sbragaglia, Valerio; Vollset, Knut; Sortland, Lene K.; McClenachan, Loren; Jarić, Ivan; Guckian, Meaghan L.; Ferter, Keno; Danylchuk, Andy J.; Cooke, Steven J.; Arlinghaus, Robert; Twardek, William M. (Peer reviewed; Journal article, 2022)
      Recreational fisheries are diverse in scale, scope, and participation worldwide, constituting an important ecosystem service of marine and freshwater ecosystems. Management of these socio-ecological systems is challenged ...

    • Ecological regime shift in the Northeast Atlantic Ocean revealed from the unprecedented reduction in marine growth of Atlantic salmon 

      Vollset, Knut; Urdal, Kurt; Utne, Kjell Rong; Thorstad, Eva Bonsak; Sægrov, Harald; Raunsgard, Astrid; Skagseth, Øystein; Lennox, Robert; Østborg, Gunnel Marie; Ugedal, Ola; Jensen, Arne Johan; Bolstad, Geir Hysing; Fiske, Peder (Peer reviewed; Journal article, 2022)
      Ecological regime shifts are abrupt changes in the structure and function of ecosystems that persist over time, but evidence of contemporary regime shifts are rare. Historical scale data from 52,384 individual wild Atlantic ...

    • Effects of tag type and surgery on migration of Atlantic salmon (Salmo salar) smolts 

      Lennox, Robert; Stöger, Elisabeth; Dahlmo, Lotte Svengård; Helle, Turid Myklebust; Wiers, Tore; Hanssen, Erlend Mjelde; Vollset, Knut (Peer reviewed; Journal article, 2022)
      Tagging salmon smolts to provide information about the timing of outmigration has been a common approach to monitor phenology and model the risk of encountering stressors. However, the validity of tagging has come under ...

    • Ethical ecosurveillance: Mitigating the potential impacts on humans of widespread environmental monitoring 

      Young, Nathan; Roche, Dominique G.; Lennox, Robert; Bennett, Joseph R.; Cooke, Steven J. (Peer reviewed; Journal article, 2022)
      Ecosurveillance has proliferated in recent years, generating vast amounts of data on the natural environment. Ecosurveillance also has significant potential impacts on humans; therefore, researchers and policymakers need ...

    • Globally coordinated acoustic aquatic animal tracking reveals unexpected, ecologically important movements across oceans, lakes and rivers 

      Lennox, Robert; Whoriskey, Frederick G.; Verhelst, Pieterjan; Vandergoot, Christopher S.; Soria, Marc; Reubens, Jan; Rechisky, Erin L.; Power, Michael; Murray, Taryn; Mulder, Ingeborg; Markham, James L.; Lowerre-Barbieri, Susan K.; Lindley, Steven T.; Knott, Nathan A.; Kessel, Steven T.; Iverson, Sara; Huveneers, Charlie; Heidemeyer, Maike; Harcourt, Robert; Griffin, Lucas P.; Friess, Claudia; Filous, Alexander; Fetterplace, Lachlan C.; Danylchuk, Andy J.; Daly, Ryan; Cowley, Paul; Cooke, Steven J.; Chávez, Elpis J.; Blaison, Antonin; Whoriskey, Kim (Journal article; Peer reviewed, 2023)
      Acoustic telemetry is a popular approach used to track many different aquatic animal taxa in marine and freshwater systems. However, information derived from focal studies is typically resource- and geography-limited by ...

    • Gytefisktelling av laks og sjøaure på Vestlandet: status og utvikling i perioden 2004–2018 

      Skoglund, Helge; Vollset, Knut; Barlaup, Bjørn Torgeir; Lennox, Robert (LFI – Laboratorium for ferskvannsøkologi og innlandsfiske, Research report, 2019)
      I de siste tiårene har situasjonen vært kritisk og uavklart for mange lakse‐ og sjøaurebestander på Vestlandet. Dette gjelder særlig for bestandene i Hardangerfjorden, hvor de fleste viktige laksevassdrag har vært stengt ...

    • Habitat and movement selection processes of American lobster/jakej within a restricted bay in the Bras d’Or Lake/Pitu’paq, Nova Scotia, Canada 

      Landovskis, Shannon; Bailey, Megan; Iverson, Sara; Jeddore, Skyler; Lennox, Robert; Murray, Caelin; Whoriskey, Fred (Peer reviewed; Journal article, 2024)
      American lobster inhabit the unique, brackish Bras d’Or Lake system, although densities are low compared to areas with similar habitats in the Atlantic Ocean. Nevertheless, lobsters are an important part of local First ...

    • Influence of dense macrophyte vegetation and total gas saturation on the performance of acoustic telemetry 

      Thiemer, Kirstine; Lennox, Robert; Haugen, Thrond Oddvar (Peer reviewed; Journal article, 2022)
      Acoustic telemetry is widely used as a method for high resolution monitoring of aquatic animal movement to investigate relationships between individual animals and their environment. In shallow freshwater ecosystem, aquatic ...

    • Long-term effects and cost-benefit analysis of eight spawning gravel augmentations for Atlantic salmon and Brown trout in Norway 

      Pulg, Ulrich; Lennox, Robert; Stranzl, Sebastian Franz; Espedal, Espen Olsen; Gabrielsen, Sven-Erik; Wiers, Tore; Velle, Gaute; Hauer, Christoph; Dønnum, Bjørn Otto; Barlaup, Bjørn Torgeir (Peer reviewed; Journal article, 2021)
      River regulation alters flow and sediment regime, habitat availability, and ultimately the ecological functioning of rivers. Various restoration and mitigation measures have been developed to improve ecological function, ...

    • Migratory contingents of brown trout reveal variable exposure to anthropogenic threats along a fjord-river continuum 

      Lennox, Robert; Hanssen, Erlend Mjelde; Normann, Eirik; Barlaup, Bjørn Torgeir; Nilsen, Cecilie Iden; Dahlmo, Lotte Svengård; Berhe, Saron; Vollset, Knut (Peer reviewed; Journal article, 2024)
      Brown trout is a partially migratory salmonid that makes use of diverse habitats to maximise growth and fitness. One of the most substantial threats to brown trout is infection with pathogens from open net-pen fish farming, ...

    • Moving cleaner fish from the wild into fish farms: A zero-sum game? 

      Lennox, Robert; Barrett, Luke T.; Nilsen, Cecilie Iden; Berhe, Saron; Barlaup, Bjørn Torgeir; Vollset, Knut (Journal article; Peer reviewed, 2022)
      Fish that engage in mutualistic cleaning behaviour (‘cleaner fishes’) have recently been popularized as a nature-based method of controlling ectoparasite outbreaks in fish farms. Outbreaks impact animal welfare and threaten ...

    • Physiology as a tool for at-risk animal recovery planning: An analysis of Canadian recovery strategies with global recommendations 

      Madliger, Christine L.; Creighton, Maria J. A.; Raby, Graham D.; Bennett, Joseph R.; Birnie-Gauvin, Kim; Lennox, Robert; Cooke, Steven J. (Peer reviewed; Journal article, 2022)
      Many government organizations use recovery planning to synthesize threats, propose management strategies, and determine recovery criteria for threatened wildlife. Little is known about the extent to which physiological ...

    • PigghåFRI – Hvordan unngå problemer med pigghå? 

      Lal, Pradeep; Oosterkamp, Antonie; Brynildsrud, Mette Espedal; Chen, I-Hao; Gharbi, Naouel; Hauss, Helena; Lennox, Robert; Dahlmo, Lotte Svengård; Tressoler, Alan Le; Hansen, Christian Andreas; Nilsen, Marius; Takvam, Marius; Gilannejad, Neda; Tronci, Valentina; Sharp, Mary-Scarlett; Menanteau-Ledouble, Simon; Tang, Patrik Anthony (Research report, 2024)
      This study has mapped the impact of interaction of spiny dogfish (Squalus acanthias) with aquaculture installations in Norway and studied the behavior of spiny dogfish, in laboratory and field studies, in response to sensory ...

    • Predation by Eurasian otters on adult Atlantic salmon 

      Sortland, Lene; Lennox, Robert; Vollset, Knut; Velle, Gaute (Master thesis, 2022)
      The return of the Eurasian otter to western Norway has sparked human-predator conflicts as otters prey on vulnerable Atlantic salmon populations. Although predation may not be the direct cause of salmon population declines, ...

    • The quest for successful Atlantic salmon restoration: perspectives, priorities, and maxims 

      Lennox, Robert; Alexandre, Carlos M; Almeida, Pedro R; Bailey, Kevin M.; Barlaup, Bjørn Torgeir; Bøe, Kristin; breukelaar, Andre; Erkinaro, Jaakko; Forseth, Torbjørn; Gabrielsen, Sven-Erik; Halfyard, Edmund; Hanssen, Erlend Mjelde; Karlsson, Sten; Koch, Stephanie; Koed, Anders; Langåker, Roy, M; Lo, Håvard; Lucas, Martyn C.; Mahlum, Shad Kenneth; Perrier, Charles; Pulg, Ulrich; Sheehan, Timothy F.; Skoglund, Helge; Svenning, Martin; Thorstad, Eva Bonsak; Velle, Gaute; Whoriskey, Frederick G.; Vollset, Knut (Peer reviewed; Journal article, 2021)
      Atlantic salmon is often a focal species of restoration efforts throughout the north Atlantic and it is therefore an excellent case study for how best to design programmes to address and mitigate threats and correct ...