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  • Dense mesopelagic sound scattering layer and vertical segregation of pelagic organisms at the Arctic-Atlantic gateway during the midnight sun 

    Priou, Pierre; Nikolopoulos, Anna; Flores, Hauke; Gradinger, Rolf; Kunisch, Eirin; Katlein, Christian; Castellani, Giulia; Linders, Torsten Theodor; Berge, Jørgen; Fisher, Jonathan A.D.; Geoffroy, Maxime (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-05-18)
    Changes in vertical and spatial distributions of zooplankton and small pelagic fish impact the biological carbon pump and the distribution of larger piscivorous fish and marine mammal species. However, their distribution and abundance remain poorly documented at high latitudes because of the difficulties inherent to sampling relatively fast-moving organisms in ice-covered waters. This study documents ...
  • Hvordan opplever mellomledere i kommunal helse - og omsorgssektor sitt handlingsrom i strategiske endringsprosesser? 

    Aas, Elin Carina (Master thesis; Mastergradsoppgave, 2020-11-30)
    Å inneha rollen som mellomleder fremstilles i mange sammenhenger som den mest krevende rollen i en organisasjon, og beskrives som en som binder sammen organisasjoners operasjonelle og strategiske nivå. Med dette utgangspunktet vil mellomlederne kunne påvirke strategiske endringsprosesser. For å belyse denne problemstillingen har jeg valgt å undersøke hvordan mellomledere i kommunal helse – og ...
  • Effektivitetsanalyse og produktivitetsutvikling i norske sparebanker. En analyse av norske sparebanker for perioden 2014-2017 ved bruk av Data Envelopment Analysis og Malmquist produktivitetsindeks 

    Borkenhagen, Kristoffer (Master thesis; Mastergradsoppgave, 2021-02-26)
    Denne oppgaven analyserer effektivitet og effektivitetsutviklingen for norske sparebanker i perioden 2014-2017. Banknæringen i Norge reguleres av regjeringen i form av boliglånsforskrifter og andre regulatoriske krav. Banknæringen spiller en viktig samfunnsrolle for å tilby trygg og stabil finansiering til befolkningen. Datagrunnlaget for analysen er hentet fra Finans Norge sine årlige utgivelser ...
  • Hvor stor betydning har medarbeidersamtalen? En masteroppgave der vi undersøker hvordan ansatte i en norsk kommune vurderer medarbeidersamtalen 

    Eriksen, Anita; Bratteng, Siv (Master thesis; Mastergradsoppgave, 2018-06-01)
    <p>Fenomenet medarbeidersamtalen kan synes å ha en variert betydning blant ansatte som har benyttet slike samtaler. Med dette som utgangspunkt ønsket vi å undersøke <i>medarbeidersamtalen</i> og hvilken betydning denne faktisk har. Vår problemstilling ble derfor «Hvor stor betydning har medarbeidersamtalen»? For å få svar på dette ble ansatte i Harstad kommune valgt ut til å besvare spørsmål knyttet ...
  • Summer and winter MgCO3 levels in the skeletons of Arctic bryozoans 

    Iglikowska, Anna; Krzemińska, Małgorzata; Renaud, Paul Eric; Berge, Jørgen; Hop, Haakon; Kuklinski, Piotr (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-02)
    <p>In the Arctic, seasonal patterns in seawater biochemical conditions are shaped by physical, chemical, and biological processes related to the alternation of seasons, i.e. winter polar night and summer midnight sun. In summertime, CO<sub>2</sub> concentration is driven by photosynthetic activity of autotrophs which raises seawater pH and carbonate saturation state (Ω). In addition, restriction of ...
  • Caligus elongatus and other sea lice of the genus Caligus as parasites of farmed salmonids: A review 

    Hemmingsen, Willy; MacKenzie, Ken; Sagerup, Kjetil; Remen, Mette; Bloch-Hansen, Karin; Imsland, Albert (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-02-24)
    This review was prompted by reports of unusually large numbers of sea lice tentatively identified as <i>Caligus elongatus</i> infesting farmed salmon in northern Norway. Following a brief introduction to the sea lice problem in salmonid aquaculture, the review is divided into a further eight sections. The first is a review of existing information on the life cycle and behaviour of <i>Caligus</i> ...
  • Let it glow! Adapting a method to detect microplastics in snow and evaluate the potential for long-range transport 

    Stürzinger, Vegard (Master thesis; Mastergradsoppgave, 2020-05-31)
    Harmonization of methods in microplastics research is lacking; this is affecting the comparability of results and hindering reproducibility. Investigating microplastics in snow is a relatively new field of research, and it can be used to answer questions about long-range atmospheric transport of microplastics. In this thesis, snow sampling methods were combined with the dye, Nile Red, to develop a ...
  • Spring sea ice algal development in the sub-Arctic Ramfjorden, northern Norway 

    Persson, Emma (Master thesis; Mastergradsoppgave, 2020-05-29)
    The seasonal development of sea ice algae and bacteria was investigated in Ramfjorden, Norway, from February to April 2019 and compared to data from two Arctic fjords, Van Mijenfjorden and Billefjorden, sampled in April 2019. The sea ice in Ramfjorden was heavily freshwater influenced with bulk salinities ranging from 0.0 to 2.8, similar to those found in freshwater influenced Baltic Sea ice. The ...
  • Fecundity and egg size in anadromous brown trout Salmo trutta 

    Rinaldo, Adrian (Master thesis; Mastergradsoppgave, 2020-05-31)
    Historically, anadromous salmonids provided a necessary provisioning service for Norwegian coastal settlements that has transitioned into the socio-cultural service that they provide today. Over the past decades, human impact has caused anadromous salmonid populations to decline. A recent assessment found many Norwegian sea trout populations to be in poor condition. Reference point management has ...
  • Faktorer som påvirker prisen på en cruisereise. En empirisk studie av prisdannelsen for Hurtigrutens cruisereiser langs norskekysten 

    Biti, Helge Tveit (Master thesis; Mastergradsoppgave, 2016-05-31)
    Denne studien undersøker prisdannelsen til Hurtigruten AS ved hjelp av en invers etterspørselsmodell, hvor formålet er undersøke hvilke faktorer som bidrar til å forklare billettprisen til Hurtigruten og hvor stor innvirkning disse faktorene har på billettprisen. Det legges spesielt vekt på å undersøke hvilken virkning ulike kampanjer har på billettprisen. Til dette formålet blir det gjort en ...
  • Linking methane fluxes and oxidation rates to methane oxidizing bacteria in an Arctic terrestrial methane seep, Svalbard 

    Nagel, Franziska (Master thesis; Mastergradsoppgave, 2020-05-29)
    Global warming has especially detrimental effects on Arctic regions. One major issue is permafrost thaw and sub-permafrost methane escape via surface seeps. While the mitigation potential of methane-consuming bacteria on marine pingo-like methane seeps is well described, terrestrial methane seeps are still understudied. Recently, open system pingos have gained attention as terrestrial methane seeps. ...
  • Bioprospecting of marine phytoplankton from large scale cultivation - Effect of culture conditions on bioactivity and biochemistry of the diatom Porosira glacialis 

    Osvik, Renate Døving (Doctoral thesis; Doktorgradsavhandling, 2021-06-23)
    The diatoms make up the largest and most important group of marine microalgae. They are responsible for a quarter of all inorganic carbon fixation in the ocean and are thus of immense importance for global CO2 sequestration. This makes them good candidates for biological carbon capture and utilization (CCU) by mass cultivation using CO2 emissions from industrial point sources. Large scale cultivation ...
  • Bioprospecting of marine fungi from the High Arctic: A study of high latitude marine fungi from understudied taxa; bioactivity potential, taxonomy and genomics 

    Hagestad, Ole Christian (Doctoral thesis; Doktorgradsavhandling, 2021-06-17)
    Marine fungi comprise a group of organisms that have been overlooked for a long time. Research interest has increased with the realization of the important ecological role and rich chemistry of marine fungi. Marine fungi have yielded thousands of new natural products the last decade, but many taxa remain unstudied. Marine fungi from the Arctic have not been reported in literature in regard to ...
  • Adding zooplankton to the OSMAC toolkit: Effect of grazing stress on the metabolic profile and bioactivity of a diatom 

    Osvik, Renate Døving; Ingebrigtsen, Richard Andre; Norrbin, Fredrika; Andersen, Jeanette Hammer; Eilertsen, Hans Christian; Hansen, Espen Holst (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-03)
    “One strain many compounds” (OSMAC) based approaches have been widely used in the search for bioactive compounds. Introducing stress factors like nutrient limitation, UV-light or cocultivation with competing organisms has successfully been used in prokaryote cultivation. It is known that diatom physiology is affected by changed cultivation conditions such as temperature, nutrient concentration and ...
  • Flashing light emitting diodes (LEDs) induce proteins, polyunsaturated fatty acids and pigments in three microalgae 

    Lima, Serena; Schulze, Peter Simon Claus; Schüler, Lisa M.; Rautenberger, Ralf; Morales-Sanchez, Daniela; Santos, Tamára F.; Pereira, Hugo; Varela, João C.S.; Scargiali, Francesca; Wijffels, Rene Hubertus; Kiron, Viswanath (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-25)
    As the periodic emission of light pulses by light emitting diodes (LEDs) is known to stimulate growth or induce high value biocompounds in microalgae, this flashing light regime was tested on growth and biochemical composition of the microalgae <i>Nannochloropsis gaditana, Koliella antarctica</i> and <i>Tetraselmis chui</i>. At low flashing light frequencies (e.g., 5 and 50 Hz, Duty cycle = 0.05), ...
  • Hibernation in European Hamsters (Cricetus crisetus): An assessment of brain permeability during torpor-arousal cycling 

    Markussen, Fredrik Andreas Fasth (Master thesis; Mastergradsoppgave, 2020-05-22)
    Hibernation is a physiological and behavioural adaptation that permits survival during seasonal periods of energy shortage via a combination of pre-hibernal energy storage and hibernal metabolic depression, i.e. torpor. The central mechanisms in the brain that control torpor expression and arousal from it has been under investigation since the dawn of hibernation research but remains unknown. Recent ...
  • Produksjonsindusert stress på rogn (Salmo salar L.) og effekter på immun- og stressrelaterte gener etter smitte av plommesekkyngel med Yersinia ruckeri 

    Sætre, Per Kristian (Master thesis; Mastergradsoppgave, 2016-05-18)
    I denne oppgaven blir det sett på hvordan produksjonsindusert stress i form av mekanisk sjokking og/eller transport under embryogenesen (300-400 døgngrader etter befruktning (dgr)) ville påvirke overlevelse og uttrykk av immun- og stressrelaterte gener på plommesekkstadiet (740-900 dgr) etter en immunologisk utfordring - badsmitte med <i>Yersinia ruckeri</i>. Utvalgte immun- og stressrelaterte gener ...
  • Humorale immunresponser i bukhule og systemiske organer hos Atlantisk laks (Salmo salar L.) – sammenligning av levende og inaktivert salmonid alphavirus 3 administrert i bukhulen 

    Abrahamsen, Mathias (Master thesis; Mastergradsoppgave, 2019-05-15)
    Pankreassykdom (PD) er en sykdom som forårsakes av salmonid alphavirus (SAV) og anses som en av de mest utbredte virussykdommene i dagens oppdrettsnæring. I tillegg til at sykdommen fører til store tap for næringa, utgjør sykdommen også et stort problem sett fra et fiskevelferds-perspektiv. Siden det ikke finnes behandling mot sykdommen ligger fokuset på forebyggende tiltak. Det er utviklet flere ...
  • Fisher's effort allocation behavior and decision-making process in the Norwegian trawl fishery 

    Alizadeh Ashrafi, Tannaz (Doctoral thesis; Doktorgradsavhandling, 2021-06-09)
    The empirical investigation of fishers’ harvest behavior is an important but neglected strand of fishery science. In this thesis, we fill some of this gap by developing empirical models to investigate trawlers’ harvest behavior over time and space in codfish fisheries, managed using individual vessel quotas (IVQs). Fishers’ harvest behavior is reflected in the decision-making processes underlying ...
  • Hav, fisk og ressursforvaltning i nordområdene 

    Hoel, Alf Håkon (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-12-08)
    Mesteparten av norske havområder ligger nord for polarsirkelen og er åsted for noen av verdens rikeste fiskerier. De største fiskebestandene er delt med andre land, og internasjonalt samarbeid om ressursforvaltningen er derfor en viktig dimensjon ved nordområdepolitikken. Slikt samarbeid er basert på globale normer om hvordan levende marine ressurser skal forvaltes og deles og foregår på en rekke ...

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