Nye registreringer

  • The hidden influence of large particles on ocean colour 

    Davies, Emlyn John; Basedow, Sünnje Linnéa; McKee, David (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-02-17)
    Optical constituents in the ocean are often categorized as water, phytoplankton, sediments and dissolved matter. However, the optical properties of seawater are influenced, to some degree, by scattering and absorption by all particles in the water column. Here we assess the relevant size ranges for determining the optical properties of the ocean. We present a theoretical basis supporting the hypothesis ...
  • Piscine Orthoreovirus (PRV)-3, but Not PRV-2, Cross-Protects against PRV-1 and Heart and Skeletal Muscle Inflammation in Atlantic Salmon 

    Malik, Muhammad Salman; Teige, Lena Hammerlund; Braaen, Stine; Olsen, Anne Berit; Nordberg, Monica; Amundsen, Marit; Kannimuthu, Dhamotharan; Svenning, Steingrim; Edholm, Eva-Stina Isabella; Takano, Tomokazu; Jørgensen, Jorunn; Wessel, Øystein; Rimstad, Espen; Dahle, Maria (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-06)
    Heart and skeletal muscle inflammation (HSMI), caused by infection with Piscine orthoreovirus-1 (PRV-1), is a common disease in farmed Atlantic salmon (Salmo salar). Both an inactivated whole virus vaccine and a DNA vaccine have previously been tested experimentally against HSMI and demonstrated to give partial but not full protection. To understand the mechanisms involved in protection against HSMI ...
  • A Surge toward a Sustainable Future: Organizational Change and Transformational Vision by an Oil and Gas Company 

    Jaber, Tahrir (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-11-13)
    <p>Context: reflecting the call being made by the United Nations to solve our current climate challenges and reduce companies’ CO2 emissions, there is a strong need for large corporations to not only employ the terminology of sustainable transitions, but to implement strategies and select new alternative sustainable solutions. <p>Objective: this study fills a gap in the literature by developing and ...
  • Redefining the oceanic distribution of Atlantic salmon 

    Rikardsen, Audun H.; Righton, David; Strøm, John Fredrik; Thorstad, Eva Bonsak; Gargan, Patrick G.; Sheehan, Timothy F.; Økland, Finn; Chittenden, Cedar; Hedger, Richard David; Næsje, Tor; Renkawitz, Mark; Sturlaugsson, Johannes; Caballero, Pablo; Baktoft, Henrik; Davidsen, Jan Grimsrud; Halttunen, Elina; Wright, Serena; Finstad, Bengt; Aarestrup, Kim (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-10)
    Determining the mechanisms driving range-wide reductions in Atlantic salmon marine survival is hindered by an insufcient understanding of their oceanic ecology and distribution. We attached 204 pop-up satellite archival tags to post-spawned salmon when they migrated to the ocean from seven European areas and maiden North American salmon captured at sea at West Greenland. Individuals migrated ...
  • Early spring subglacial discharge plumes fuel under-ice primary production at a Svalbard tidewater glacier 

    Vonnahme, Tobias; Persson, Emma; Dietrich, Ulrike; Hejdukova, Eva; Dybwad, Christine; Elster, Josef; Chierici, Melissa; Gradinger, Rolf (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-04-27)
    Subglacial upwelling of nutrient-rich bottom water is known to sustain elevated summer primary production in tidewater-glacier-influenced fjord systems. However, the importance of subglacial upwelling during the early spring season has not been considered yet. We hypothesized that subglacial discharge under sea ice is present in early spring and that its flux is sufficient to increase phytoplankton ...
  • 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 ...
  • Workshop methodology design: Innovation-oriented participatory processes for sustainability 

    Bertella, Giovanna; Lupini, Sara; Romanelli, Cecilia Rossi; Font aulet, Xavier (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-06-03)
    Workshop methodologies based on overarching knowledge structures are necessary for a shift of the tourism sector towards sustainability. We adopted a participatory action research approach and designed a workshop methodology based on the main tenets and tools of the theory of change, design thinking, and sustainable business models. We tested this methodology within a project initiated by a destination ...
  • 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 ...

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