Blar i tittel Doktorgradsavhandlinger (BFE-fak)

Viser treff 261-271 av 271

    • Understanding and forecasting population dynamics in changing arctic ecosystems 

      Marolla, Filippo (Doctoral thesis; Doktorgradsavhandling, 2020-10-21)
      Rapid environmental changes are currently occurring in the Arctic because of global warming. Arctic food webs can exhibit complex dynamics because of the prevalence of tight interactions between trophic levels. Climate change impacts can therefore propagate across food webs and result in non-trivial indirect effects on arctic species and populations. In this thesis, constituted by four papers, I ...

    • Understanding and practising market orientation : exploring how managers cope in turbulent environments 

      Ottesen, Geir Grundvåg (Doctoral thesis; Doktorgradsavhandling, 2001-11-23)
      Ottesens doktorgrad fokuserer på hva det innebærer å være markedsorientert for bedrifter i fiskerinæringen. I næringsmessige debatter blir det ofte påpekt at norsk fiskeindustri må bli mer markedsorientert. Mens begrepet markedsorientering har blitt et moteord som brukes av både politikere og næringsliv, blir det sjelden klargjort hva dette innebærer. Resultatene fra avhandlingen avdekker hvordan ...

    • Understanding researchers’ intention and habit regarding publishing in open access journals 

      Moksness, Lars (Doctoral thesis; Doktorgradsavhandling, 2018-12-13)
      Scholarly publishing is the vessel for the dissemination of research articles. Contemporary scholarly publishing is achieved by two main models, open access (OA) and non-open access (non-OA). OA refers to articles that are available at no cost to the end-user; however, authors may incur a fee for accepted manuscripts. Non-OA articles are available at a cost, either via subscriptions or via individual ...

    • Understanding winter patterns of zooplankton Diel Vertical Migration (DVM) in a high Arctic fjord (Kongsfjorden, Svalbard) 

      Grenvald, Julie Cornelius (Doctoral thesis; Doktorgradsavhandling, 2017-05-09)
      Recent Arctic studies contradict a long-held paradigm of winter quiescence by documenting activity at many trophic levels in the marine food web even during the darkest months of winter. Previous studies have failed to identify which species are performing patterns of vertical migrations during polar night in Kongsfjorden (Svalbard). In the present study, acoustic data supplemented by zooplankton ...

    • Upstream vertical integration and financial performance : the case of the Norwegian fish processing industry 

      Isaksen, John R. (Doctoral thesis; Doktorgradsavhandling, 2007-06-08)
      In this thesis, four different articles address the correlation between vertical integration and profitability in the Norwegian fish processing industry. By vertical integration we mean the ownership and control of one firm over different stages in the value chain. Firms within this industry consider the uncertain supply of fish as a main challenge. Literature prescribes vertical integration as an ...

    • The use of stated preferences and bio-economic modeling in marine ecosystem service management: Case studies from Arctic Norway 

      Ahi, Julide Ceren (Doctoral thesis; Doktorgradsavhandling, 2022-06-09)
      <p>Regarding the growing population and escalated development on the coasts, the environmental policymakers often face the dilemma of exploiting or protecting marine and coastal ecosystem services (ES). Therefore, the non-market valuation has become an essential instrument for supporting policymakers in eliciting preferences and welfare estimates regarding various ES, which further feed into the ...

    • Valuing Unfamiliar and Complex Ecosystem Services: The influence of survey mode, knowledge and dishonesty 

      Sandorf, Erlend Dancke (Doctoral thesis; Doktorgradsavhandling, 2016-08-15)
      Increasing demand for valuation of ecosystem services has led stated preference methods to be applied to public goods that are increasingly complex and unfamiliar. Traditionally, stated preference surveys were conducted via mail or face-to-face interviews, but over the past two decades internet panels have been used to a larger extent. As we move away from traditional methods of survey administration ...

    • Vertical Carbon Export in a Changing Arctic Seasonal Ice Zone: Composition and seasonality in the area north of Svalbard and in an Arctic glacial fjord 

      Dybwad, Christine (Doctoral thesis; Doktorgradsavhandling, 2023-12-11)
      The ocean’s biological carbon pump (BCP) is a vital part of the global carbon cycle as it produces, transforms, and transfers organic carbon from the surface ocean to the deep. To model the oceans capacity to store carbon today and in the future, we need to understand these processes well. In the Eurasian Arctic, the marine ecosystems who control most of the BCP face a rapid decline in sea ice cover, ...

    • Vole population cycles and the role of colonisation 

      Glorvigen, Petter (Doctoral thesis; Doktorgradsavhandling, 2012-12-06)
      The multiannual population cycles in small rodents have triggered an intense debate between proponents of population-intrinsic and community-extrinsic factors as the cycle generating mechanisms. A well-known challenge is the apparent absence of vole individuals during the low phase of the population cycle and the fact that most studies addressing vole and lemming behaviour and demography are conducted ...

    • Why do Prices Change? An Analysis of Supply and Demand Shifts and Price Impacts in the Farmed Salmon Market 

      Brækkan, Eivind Hestvik (Doctoral thesis; Doktorgradsavhandling, 2014-09-01)
      Price changes in any market are essentially due to shifts in supply relative to demand. In a global market there can be several simultaneous supply and demand shifts in different geographical locations, all affecting prices to different extents. This dissertation focuses on procedures for measuring such shifts and their relative effects on prices by looking at the global market for farmed salmon ...

    • Zooplankton seasonality at high latitudes: From community to behaviour 

      Coguiec, Estelle (Doctoral thesis; Doktorgradsavhandling, 2023-05-16)
      This thesis describes the seasonality of the mesozooplankton community in Ramfjord, a shallow high-latitude fjord, in terms of diversity and behavior, using a combination of new and traditional methods. The approach aimed to gain insight into how environmental drivers such as photoperiod and food availability shape seasonal changes in mesozooplankton community structure and <i>Calanus</i> spp. ...