Viser treff 153-172 av 271

    • Land-Ocean Interactions in a Changing Arctic: Effects of terrestrial inputs on coastal food-web carbon source and contamination in Isfjorden, Svalbard 

      McGovern, Maeve (Doctoral thesis; Doktorgradsavhandling, 2022-04-29)
      Climate change driven increases in temperature are enhancing land-ocean connectivity in the coastal Arctic, with a range of implications for coastal food-webs and contaminant cycling. Terrestrial inputs are a direct source of carbon and legacy contaminants to coastal areas, but as a source of freshwater, nutrients and suspended inorganic sediments, they can also affect coastal food-webs and contaminant ...
    • Late Weichselian to early Holocene vegetation and bird activity on Andøya, Nordland County : as evidenced primarily by macrofossils 

      Elverland, Ellen (Doctoral thesis; Doktorgradsavhandling, 2012-10-26)
      This thesis shows that Late Weichselian vegetation on Andøya may have been more diverse than previous studies have revealed. The thorough investigation of macrofossils in four parallel cores provides more reliable evidence for interpreting changes in vegetation cover than reconstructions based on a single core. The botanical macrofossils retrieved in this study largely support previous studies ...
    • Life history and distribution of the edible crab (Cancer pagurus) in Norway - Effect of temperature and other environmental parameters at high latitudes 

      Bakke, Snorre (Doctoral thesis; Doktorgradsavhandling, 2019-06-25)
      The overall aim of this study has been to provide information on how environmental conditions in Norway might affect the life history and distribution of the edible crab (<i>Cancer pagurus</i>). The results show that the size at which female crabs reach physiological maturity vary little, and just randomly, across northern Europe, and among latitudinally separated areas within Norway. Analysis of ...
    • Live-storage of wild mature cod (Gadus morhua L.) without feed supply. Effects on biological and quality properties 

      Ageeva, Tatiana N. (Doctoral thesis; Doktorgradsavhandling, 2018-09-28)
      The overall aim of this work was to obtain better understanding of how live-storage without feeding affects wild mature Atlantic cod (Gadus morhua L.) and quality of products obtained from such cod. Atlantic cod were live-stored without feeding for 82 days. First, gender-specific weight changes in both whole and gutted fish, as well as certain organs were studied (Paper I). Next, the effects of feed ...
    • Living on the dark side? Investigations into under-ice light climate and sympagic amphipods 

      Krapp, Rupert Harald (Doctoral thesis; Doktorgradsavhandling, 2022-06-10)
      The manuscripts of the dissertation presented here encompass several aspects of adaptations in ice-associated amphipods, focussing mainly on their ability to cope with increased light levels, including the ultraviolet radiation (UVR), under thinner or more dispersed sea ice. A decrease in multi-year ice (MYI) in the Arctic, and a concurrent reduction in stable habitat for ice-associated species, is ...
    • Local support for biodiversity conservation in community-based protected area governance 

      Engen, Sigrid (Doctoral thesis; Doktorgradsavhandling, 2018-06-13)
      Worldwide there have been many attempts to implement community-based conservation to gain a more inclusive protection of biological diversity. Reducing human pressures on ecosystems is necessary for favorable ecological outcomes of protected areas, but conservation initiatives that rely on strict enforcement without local support are vulnerable to rule-violations, public protests and a reduced ...
    • Lokale rettighetsforståelser i fiskeriforvaltningen 

      Søreng, Siri Ulfsdatter (Doctoral thesis; Doktorgradsavhandling, 2014-04-09)
      Fordeling av rettigheter til ressurser og rettferdig fordeling av ressursene er sentrale forhold ved ressursforvaltningen. Spennet mellom hvordan naturressursene faktisk forvaltes, og synspunkter på hvordan de bør forvaltes, kan være stort og tidvis konfliktfylt. Dette er det også ulike meninger om, avhengig av hvem som blir spurt, og hvem sine interesser som får gjennomslag i ressursforvaltningen. ...
    • Long-term dynamics of metazoan parasites in an age- and size-structured host population 

      Henriksen, Eirik Haugstvedt (Doctoral thesis; Doktorgradsavhandling, 2021-10-29)
      <p>Parasites negatively affect hosts and may constitute serious management problems. At the same time, parasites are integral components of ecosystems and represent a substantial part of the biodiversity on earth. Understanding the ecological factors that influence the abundance and distribution of parasite populations is therefore important from a management perspective, but also to understand the ...
    • Making Sami Seascapes Matter : ethno-ecological governance in coastal Norway 

      Brattland, Camilla (Doctoral thesis; Doktorgradsavhandling, 2012-06-22)
      This thesis addresses the lack of knowledge production on impacts of new marine industries on coastal Sami culture in the Norwegian coastal zone. It asks how Sami culture matters in contemporary Norwegian marine governance, and discusses how ecosystem mapping practices facilitate knowledge production on Sami relations and use of the marine environment. This is done through five papers and a film, ...
    • The management of lobster in coastal Skagerrak : recreational fisheries, unreported commercial catches andmarine protected areas 

      Kleiven, Alf Ring (Doctoral thesis; Doktorgradsavhandling, 2010-09-30)
      The implementation of four experimental lobster reserves in Norway in 2006 highlighted a set of important questions regarding lobster management. This thesis presents a study on the management and fishery of the European lobster (Homarus gammarus) in Skagerrak. Firstly, the implementation process of the lobster reserves was analysed. It revealed that local stakeholders, such as recreational fishers, ...
    • Management of the alien invasive red king crab Integrating natural and social science perspectives 

      Falk-Petersen, Jannike (Doctoral thesis; Doktorgradsavhandling, 2012-06-12)
      The red king crab (Paralithodes camtschaticus) is a highly valuable resource that also represents a potential threat since it is an alien invasive species in the Barents Sea ecosystem. This thesis explores the use of different interdisciplinary frameworks to analyse how ecological, social and economic concerns could be accounted for in deciding on how the king crab should be managed in the Norwegian ...
    • Mapping nature’s contribution to people: Opportunities and limitations of crowdsourced data to identify place-based values and conservation concerns 

      Muñoz, Lorena (Doctoral thesis; Doktorgradsavhandling, 2020-06-16)
      Nature provides people with a wide range of benefits, also known as nature’s contributions to people (NCP). The NCP framework evolved from the Ecosystem services (ES) concept as a response to the critiques and misconceptions associated with ES over the last years. Broadening ES valuations that have been dominated by economic valuations, the NCP framework emphasizes a pluralistic approach to valuation ...
    • Marine Ecosystem Governance in the Making : Planning for petroleum activity in the Barents Sea-Lofoten area 

      Knol, Maaike (Doctoral thesis; Doktorgradsavhandling, 2011-03-25)
      Expanding petroleum activity in the Barents Sea-Lofoten area has worked as a catalyst for the development and introduction of the first integrated, ecosystem-based management plan in Norway. This plan sets the framework, in particular, for further petroleum activities. Building on Science and Technology Studies (STS) this thesis provides an analysis of the practices and instrumentation of marine ...
    • Marine food-web structure and community patterns in high-latitude marine ecosystems 

      Kortsch, Susanne (Doctoral thesis; Doktorgradsavhandling, 2016-06-24)
      This PhD deals with spatial and temporal community patterns in Barents Sea marine food webs and benthic communities in Svalbard. A main aim of this PhD project has been to study how community and food-web structure changes along environmental and climatic gradients, and to elucidate how species respond to climate warming in the Arctic. We used network analysis to study how the network of who eats ...
    • Marine microbial eukaryotes in Svalbard waters: Seasonality, community composition and diversity 

      Marquardt, Miriam (Doctoral thesis; Doktorgradsavhandling, 2016-10-18)
      There is an increasing awareness of the importance and diversity of the microbial community in Arctic regions, but their role in the ecosystem is still largely unknown. Sampling was conducted in Svalbard waters with focus on the Adventfjorden-Isfjorden time series station (IsA, West Spitsbergen) that was sampled frequently from December 2011 to December 2012. The community composition of microbial ...
    • Marine tourism fisheries - Challenges of governance and governability Northern Norway as a case study 

      Solstrand, Maria-Victoria (Doctoral thesis; Doktorgradsavhandling, 2014-12-17)
      The research focus for this dissertation is marine tourism fisheries – a sector rapidly growing in popularity in Northern Norway. Data from this research study suggest that the ecological impacts may be more significant than previously thought. As such, it is suggested that marine tourism fisheries be considered separately from recreational fishing, and alongside commercial-scale and small-scale ...
    • Mass cultivation of some common coldwater diatoms (Bacillariophyceae): lipids vs. growth conditions 

      Artamonova, Elena (Doctoral thesis; Doktorgradsavhandling, 2017-02-27)
      The present study was aimed at investigating northern diatoms as sustainable sources of omega-3 fatty acids widely used and now much needed in salmon aquaculture as well as ingredients to be used in nutraceuticals in the human diet. As known, fish oil is currently the main source of physiologically requisite fatty acids such as eicosapentaenoic (EPA) and docosahexaenoic acids (DHA). Due to the rapid ...
    • Mechanisms of Host Plant Infection by the Parasitic Angiosperm Cuscuta 

      Olsen, Stian (Doctoral thesis; Doktorgradsavhandling, 2017-05-12)
      The highly adapted parasitic plants of the genus Cuscuta infect other plants to steal their water and nutrients. They do so by developing specialized organs called haustoria that grow into the tissue of the host plant establishing interspecies connections through which the parasite feeds. Although it has long since been suggested that some manner of modification to host cell walls is necessary to ...
    • Meroplankton on Arctic inflow shelves: Diversity, seasonality and origins of benthic invertebrate larvae on the Barents and Chukchi shelves 

      Descôteaux, Raphaëlle (Doctoral thesis; Doktorgradsavhandling, 2022-10-05)
      Planktonic early life stages of marine benthic invertebrates play an important role in dispersal and at times represent a substantial proportion of the zooplankton. Information about the larval communities present on the Arctic inflow shelves of the Barents and Chukchi Seas, however, is incomplete and limited because of infrequent sampling and low resolution of identification. The aims of the work ...