Viser treff 161-180 av 271

    • 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 ...
    • Metabolic fingerprinting applied in diatom taxonomy 

      Huseby, Siv (Doctoral thesis; Doktorgradsavhandling, 2012-06-18)
      The main aim of this thesis was to investigate if and how metabolic fingerprinting can be applied in diatom taxonomy. Even though both morphology and gene sequences have been shown to be appropriate tools in diatom taxonomy there are cases where these give contradicting results, like in the case of cryptic species. Cryptic species have similar morphology but are genetically different. Another issue ...
    • Microbial communities and metabolic networks in Arctic peatlands 

      Tveit, Alexander Tøsdal (Doctoral thesis; Doktorgradsavhandling, 2014-05-02)
      Arctic peatlands store more than one sixth of the soil organic carbon (SOC) on Earth. Microorganisms decompose SOC, leading to the production of the greenhouse gases methane (CH4) and carbon dioxide (CO2). Large temperature increases are predicted in the Arctic towards the end of the century (1–6 °C in summer and 2–11 °C in winter). How the microorganisms in Arctic peatlands will respond to this ...
    • Microbial community structure associated to Arctic cold seeps 

      Carrier, Vincent (Doctoral thesis; Doktorgradsavhandling, 2021-11-29)
      Cold seeps are locations on the seafloor where CH<sub>4</sub> migrates from reservoirs below sediments towards the atmosphere, sustaining thereby a high microbial and macrofaunal biomass and a diversity contrasting from the surrounding seafloor. The oxidation of methane and sulphide are typically the main sources of primary productivity of these ecosystems and have therefore gained a particular ...
    • Microbial community variation in an Arctic shelf seafloor. Biogeographic and anthropogenic influences 

      Nguyen, Tan Thi (Doctoral thesis; Doktorgradsavhandling, 2017-04-21)
      Studying the spatial patterns of microbial diversity is crucial in order to assess the relationship between community structure and ecosystem function. However, due to methodological limitations in the past, relatively little has been known about the biogeography of microbial communities. The introduction of next generation sequencing technologies from 2005 was a game changer, as DNA sequencing ...
    • Microbial diversity and ecology in the coastal Arctic seasonal ice zone 

      Vonnahme, Tobias (Doctoral thesis; Doktorgradsavhandling, 2021-03-11)
      Marine microbes are crucial for the marine food web and carbon cycle. Algae are the main source of organic matter in the oceans with algae blooms triggering reoccurring bacterial succession patterns. Bacteria can recycle nutrients from organic matter coming from land or algae, fueling regenerated primary production. Terrestrial freshwater inputs can have substantial impacts on Arctic marine microbes ...
    • Microbial eukaryotes and their functional importance in the Arctic. A Svalbardian perspective 

      Wutkowska, Magdalena (Doctoral thesis; Doktorgradsavhandling, 2020-11-06)
      <p>Microbial eukaryotes, including protists and fungi, play diverse functions in virtually all ecosystems. In the High Arctic, their high biomass and diversity reflects crucial ecological importance and the performance of key ecological processes. Protists are the main primary producers in arctic seas, whereas fungi are an important group of decomposers and symbiotic partners of plants in terrestrial ...
    • Migration Ecology of North Atlantic Humpback Whales: Mapping Movements throughout the Annual Cycle 

      Kettemer, Lisa Elena (Doctoral thesis; Doktorgradsavhandling, 2023-11-23)
      Animal migration is a fascinating natural phenomenon where large numbers of animals embark on long-distance journeys, seeking out favorable environmental conditions and prey throughout the annual cycle. In this thesis, a range of techniques was used to fill major knowledge gaps in humpback whale (<i>Megaptera novaeangliae</i>) movement patterns and migration ecology in the North Atlantic Ocean. ...
    • Migration in seabirds: seasonal structure in space and environment across species, populations and individuals 

      Merkel, Benjamin (Doctoral thesis; Doktorgradsavhandling, 2019-05-21)
      Identifying drivers of population trends in migratory species is difficult, as they can face many stressors while moving through different areas and environments during the annual cycle. Their population response to environmental change may in addition be affected by consistent differences in individual behaviour, which are widespread in free-living populations. An understanding of the structure of ...