Browsing Brage NMBU by Author "Haugen, Thrond Oddvar"
Now showing items 1-20 of 57
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16 years of river restoration : effects of restoration measures on macroinvertebrates and salmonids in Bognelv, Northern Norway
Kivle, Dina Emilie Norum; Schmitz, Sunniva Buvarp (Master thesis, 2022)Lotic ecosystems worldwide are being degraded by human activities, with severe consequences for stream biota. River restoration has gained momentum over the last decade, but many projects lack the long-term monitoring ... -
Anadromous Arctic charr : mapping of migration and habitat use in Isfjorden, Svalbard
Thorkildsen, Thor Bjørn (Master thesis, 2022)The movements of 90 anadromous Arctic charr Salvelinus alpinus (mean ± s.d. fork length = 45.63 ± 5.6 cm) in fresh-, brackish-, and marine waters were studied from mid-July to midSeptember 2021 use of acoustic telemetry ... -
Anthropogenic and natural size-related selection act in concert during brown trout (Salmo trutta) smolt river descent
Haraldstad, Tormod; Höglund, Erik; Kroglund, Frode; Olsen, Esben Moland; Hawley, Kate Louise; Haugen, Thrond Oddvar (Peer reviewed; Journal article, 2020)By hindering migration and inducing direct turbine mortality during downstream migration, hydropower is regarded as one of the most serious threats to anadromous salmonids. Yet, little attention has been paid to long-term ... -
Area use and movement patterns of wild and escaped farmed Atlantic salmon before and during spawning in a large Norwegian river
Moe, Karina; Næsje, Tor; Haugen, Thrond Oddvar; Ulvan, Eva Marita; Aronsen, Tonje; Sandnes, Tomas; Thorstad, Eva Bonsak (Journal article; Peer reviewed, 2016) -
Behavioral study of coexisting populations of anadromous brown trout and arctic char that overwinter in a subarctic lake
Monsen, Geir-Johnny (Master thesis, 2019)This was an acoustic telemetry study on winter ecology and migratory behavior of anadromous brown trout (salmo trutta) and arctic char (salvelinus alpinus). The two species are coexisting in a subarctic lake of northern ... -
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 (Peer reviewed; Journal article, 2021)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 ... -
Cod on the dive : investigating Atlantic cod of the Inner Oslofjord during population decline
Craig, David Charles (Master thesis, 2021)The Atlantic Cod population of the Inner Oslofjord is in the midst of a collapse and a catch ban has been in effect since 2019. This project was designed to study demography, population size and migration in the Atlantic ... -
Determinants of habitat utilization patterns of European lobsters (Homarus gammarus) in the Inner Oslo Fjord, Norway
Teyie, Sharon (Master thesis, 2022)Habitat type and structure influences diversity body size, recruitment, population size structure and survival of species in marine communities. There is, however, inadequate empirical evidence on what substitutes ... -
Does tunnel wash water have an impact on vital rates and displacement of Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) in river Årungselva
Dahle, Amund (Master thesis, 2021)Earlier studies on runoff water from roads and tunnels have demonstrated that such water hold toxic substances that can be harmful to aquatic biota. River Årungselva, which flows into the inner part of Bunnefjorden close ... -
Ecological condition, alpha diversity, abundance and functional groups in macroinvertebrate communities of 15 tributaries in the Verdal watershed
Hoberg, Hannah (Master thesis, 2022)Streams and rivers are some of the most degraded and threatened ecosystems in a global perspective. There are several factors influencing declines in biodiversity globally, with the most driving agents being pollution, ... -
Effect of salmon lice (Lepeophtheirus salmonis) infestations on the behaviour of prematurely returned sea trout (Salmo trutta) in the Hardangerfjord
Willassen, Kaja (Master thesis, 2022)The expansion of the salmon farming industry along the Northern coasts has caused a higher concentration of salmon lice (Lepeophtheirus salmonis) in the coastal waters and fjords. There has been observed that Sea trout ... -
Effects from environmental factors and individual characters on activity and depth use in a Northern pike (Esox lucius) population subjected to recreational fishing : an acoustic telemetry study
Amalie, Haugen (Master thesis, 2018)Northern pike (Esox lucius) is a common top- predator in freshwater systems all over the Northern Hemisphere. For centuries it has been a popular target for recreational anglers. In many freshwater ecosystems, recreational ... -
Effects of fork length on the utilization distribution and habitat preferences of anadromous Arctic charr (Salvelinus alpinus) in a sub-arctic lake
Sandnes, Anders Kristoffer Halsvik (Master thesis, 2021)This was an acoustic telemetry study investigating lacustrine habitat utilization of anadromous population of Arctic charr (Salvelinus alpinus) located in Storvatnet in Hammerfest multiplicity northern Norway. Arctic charr’s ... -
Effects of low frequency acoustic pulses on startle behaviour and EOD activity in elephantnose fish (Gnathonemus petersii)
Karlsen, Hans Christian Sørnes (Master thesis, 2016-11-21)The sensory system initiating C-response and electric organ discharge (EOD) response in the hearing specialist elephantnose fish was studied in an experimental swing chamber set-up. The swing chamber is specially designed ... -
Effects of macrophyte removal on habitat use of brown trout (Salmo trutta)
Torske, Astrid (Master thesis, 2021)Aquatic macrophytes play an important role in freshwater ecosystems. They are primary producers, promote good water quality, and provide food and habitats for various organisms, including fish. When macrophytes have ... -
Effekten av restaureringstiltak og miljø på yngeltettheten av sjøørret (Salmo trutta) i 15 sidebekker til Verdalselva
Berntsen, Erland Båtnes (Master thesis, 2022)Europas ferskvannsøkosystemer er under sterkt press fra habitatfragmentering og degradering. For ørret, som har anadrome bestander, er dette spesielt negativt. I Verdalselva utgjør bekkelukkinger og påvirkning fra landbruket ... -
En evaluering av ung sjøørrets (Salmo trutta) vandringsdynamikk og overlevelse i seks sidebekker til Verdalsvassdraget ved hjelp av PIT-telemetri
Ustvett, Thomas Haugen (Master thesis, 2021)Menneskelige inngrep er en av de største truslene mot jordens fauna, og slike trusler har også medført at bestanden av sjøørret (Salmo trutta L.) i Norge er sterkt redusert sammenlignet med tidligere. Lakselus ansees som ... -
Evaluering av fysiske miljøtiltak og miljøeffekter på yngeltetthet av sjøørret (Salmo trutta) i 13 bekker i Verdal kommune
Pedersen, Emilie (Master thesis, 2021)Inngrep i bekker og elver i forbindelse med infrastruktur og jordbruk, kan medføre vandringsproblemer og uegnet habitat for anadrom laksefisk. Tiltak for å forbedre bekkehabitater og gjenopprette vandringsmulighetene mellom ... -
Evaluering av fysiske tiltak og miljøeffekter på yngeltetthet hos sjøørret (Salmo trutta) i Verdalsvassdragets sidebekker
Richenberg, Hanne Marie (Master thesis, 2019)Vandringshindre og forringelse av habitat oppstår ofte i forbindelse med utbygging av infrastruktur og aktivt jordbruk. Dette kan føre til uegnet habitat for sjøørreten (Salmo trutta), eller at muligheten til å fullføre ... -
Facilitating migration for anadromous salmonids through restoration and compensation : challenges and opportunities
Falk, Marianne-Isabelle (Master thesis, 2021)Many of the rivers that flow into the inner part of the Oslo fjord have for a long time been subjected to habitat change done to facilitate a growing human population with all the requirements that follow. This has led to ...