• Activity of XTHs during host plant infection by the parasitic plant Cuscuta. 

      Sarfowaa, Adwoa (Master thesis; Mastergradsoppgave, 2019-05-15)
      Parasitic plants including Cuscuta develop specialized structures called haustoria during infection. These specialized organs give the parasite the capacity of host attachment, invasion, vasculature connection and material transfer between the host and the parasite. Successful invasion allows organic substances, nutrients and water to flow into the parasite through the host phloem and xylem cells. ...
    • Adaptive radiation of the European whitefish Coregonus lavaretus (L.) in the Pasvik watercourse: the genetic description of a new morph 

      Couton, Marjorie (Master thesis; Mastergradsoppgave, 2012-11-26)
      Sympatric occurring fish morphs in postglacial lakes usually exhibit differences in morphology and physiology driven by adaptations to differential trophic niches. The European whitefish (Coregonus lavaretus (L.)) is a highly variable fish species, with more than 200 intraspecific forms described in Europe. The morphs usually differ in their number of gill-rakers, therefore this trait has been ...
    • Addressing the aquatic vertebrate community of Vågsfjorden 2019 with the use of Environmental DNA 

      Mikalsen, Simeon Jonatan (Master thesis; Mastergradsoppgave, 2020-05-15)
      In order to estimate biodiversity or do species counts, detramental techniques such as trawling or longlining have been used. Lately techniques used to monitor, such as baited remote underwater video systems and environmental DNA have been tested as possible methods to investigate species richness and abundance, the latter which will be used in this thesis. Using eDNA methodology, a northern ...
    • Allochthonous Allelopathy. Effects of Empetrum nigrum chemical interference on plant development 

      Pilsbacher, Anna Katharina (Master thesis; Mastergradsoppgave, 2016-05-20)
      The dwafshrub Empetrum nigrum uses phenolic compounds exuded by its leaves to depress the germination and growth of its surroundings. The allelopathic effect has, only been studied in areas immediately surrounding the plant (autochthonous allelopathy) but not in an open system apptoach that takes into account that a multitude of EMpetrum nigrum leaves get introduced into new environments through ...
    • Alternative prey choice in the pteropod Clione limacina (Gastropoda) studied by DNA-based methods 

      Kallevik, Ida Helene Funderud (Master thesis; Mastergradsoppgave, 2013-11-15)
      The gymnosome pteropod Clione limacina is regarded as a monophagous predator, feeding exclusively on the thecosome pteropod Limacina helicina in Arctic waters. C. limacina is adapted to survive periods of low food availability by long-term starvation. Although L. helicina is absent from the water, a number of other zooplankton species are present during this time. It may therefore seem surprising ...
    • An analysis of dietary variation in Icelandic arctic fox (Vulpes lagopus) over a period of 30 years using stable isotopes 

      Ellgutter, Jennifer Alejandrina Carbonell (Master thesis; Mastergradsoppgave, 2017-05-14)
      Identifying the food resources for a species is one of the basic steps towards understanding population dynamics. The arctic fox is the only terrestrial carnivore on Iceland, and the population had been increasing until recently. Therefore, it is of great importance to know what factors regulate the population growth and which resources support it to understand why the population fluctuates. In this ...
    • Analysis of xyloglucan-modifying genes and enzymes at graft-junctions of tomato plants 

      Lundblad, Herman (Master thesis; Mastergradsoppgave, 2020-05-16)
      Grafting is a widely used technique for propagation of plants in both agriculture and horticulture worldwide and involves combining two or more plants into one chimeric plant, ultimately with a shared vascular system. Benefits of grafting such as pathogen resistance, increase in fruit yield and abiotic stress tolerance have long been known, but the biological mechanisms of how plants graft are still ...
    • Annual population dynamics of the small harpacticoid copepod Microsetella norvegica in a high latitude fjord (Balsfjord, Northern Norway) 

      Antonsen, Maria Terese (Master thesis; Mastergradsoppgave, 2014-11-16)
      Annual population dynamics and vertical distribution of the small (< 0.6 mm) hapacticoid copepod, Microsetella norvegica, was investigated through monthly sampling at station Svartnes in Balsfjord, Northern Norway from May 2013 to June 2014. M. norvegica is a pelagic particle feeder, and distributed from temperate waters to sub-arctic fjords, but frequently underestimated because of its small size. ...
    • Application of an underwater hyperspectral imager (UHI) for the study of sea ice algae 

      Osanen, Janina (Master thesis; Mastergradsoppgave, 2022-08-22)
      Sea ice provides an important habitat for sea ice algae, the main primary producers in sea ice covered ocean areas. In order to reliably estimate sea ice algal distribution and production, it is important to develop remote sensing methods that can provide these estimates with minimal coring. Underwater hyperspectral imagers (UHI) can capture fine-scale variability in the transmitted spectral profile ...
    • Arctic fox diet in Yamal peninsula 

      Cerezo Araujo, Maite (Master thesis; Mastergradsoppgave, 2015-05-15)
      Arctic fox in inland areas has been typically described as a species dependent on rodent populations, but being able to use alternative prey, therefore named an opportunistic specialist. Rodent populations in the low shrub tundra of southern Yamal peninsula exhibit at present low amplitude cycles. The hypothesis for this thesis is that the low abundance of small rodents is not enough to sustain ...
    • Arctic marine microbial ecology during the Svalbard Polar Night 

      Amargant Arumí, Martí (Master thesis; Mastergradsoppgave, 2018-05-15)
      This study investigated the presence and activity of the components of the microbial food web (sepcifically viruses, heterotrophic bacteria and nanoflagellates, and autotrophic Cyanobacteria and pico-nanoflagellates) in the waters around the Svalbard archipelago (Norway) during the polar night period. The study focused on two major questions – are there differences in the community composition in ...
    • Are Hooded seals (Cystophora cristata) endowed with mechanisms for non-shivering thermogenesis within the skeletal muscle? 

      Chiu, Matthew (Master thesis; Mastergradsoppgave, 2022-06-15)
      Hooded seals (Cystophora cristata) are marine mammals and are characterised as an “Arctic seal” species due to their close association to the pack ice. Their relationship with the ice and water creates challenges in maintaining an internal body temperature of ~37°C. In homeothermic animals, like the hooded seal, shivering is used for thermogenesis, however this can rapidly fatigue skeletal muscle. ...
    • Assessing the deterrence effect of target-specific acoustic startle technology on killer whales and humpback whales during interactions with Norwegian purse seine herring fishery 

      Langstein, Elida (Master thesis; Mastergradsoppgave, 2023-05-15)
      Norwegian fishers report an increase in negative interactions with marine mammals: An issue that is also on the rise, globally. Efforts to mitigate these interactions using currently available methods have yielded little success for larger cetaceans. This study examines the efficacy of a novel target-specific acoustic startle technology (TAST) in deterring killer whales (Orcinus orca) and humpback ...
    • Assessing winter pasture quality in Sunnfjord wild reindeer area 

      Slåtsveen, Trine-Lise (Master thesis; Mastergradsoppgave, 2019-11-30)
      Winter pastures are bottlenecks for population trends for wild reindeer, and the quality and availability are important parameters when managing populations. Sunnfjord, considered on of the smallest wild reindeer districts in Norway, have never had a comprehensive evaluation of accessible winter pasture within. The aim of study is to assess the quality of winter forage in all tree sub- areas within ...
    • An assessment of survey methods to estimate spring density of two ptarmigan species in arctic Norway 

      Delaye, Aurélie; Strømeng, Marita Anti (Master thesis; Mastergradsoppgave, 2016-05-17)
      Both Willow ptarmigan (Lagopus lagopus) and Rock ptarmigan (Lagopus muta) are important game species in mainland Norway, but were recently added to the Norwegian Red List due to long-term population declines. Yet the knowledge about the population dynamics and the underlying drivers of both species is limited, especially for L. muta. Developing robust methods for long-term monitoring of population ...
    • An assessment of three survey methods on common bird species in low Arctic tundra.Comparing line transect distance sampling, repeated point counts and double observer point counts 

      Lindgaard, Erik Schmidt (Master thesis; Mastergradsoppgave, 2017-05-15)
      Long-term studies of bird communities in Arctic regions are rare in comparison to studies performed in temperate regions, particularly studies that takes detectability into consideration. Finding a suitable and robust method for long-term monitoring of bird populations in the low Arctic which includes a correction of imperfect detection, can contribute to increased ecological understanding and easier ...
    • Associations between herbivorous zooplankton, phytoplankton and hydrography in Porsangerfjord, northern Norway 

      Priou, Pierre (Master thesis; Mastergradsoppgave, 2015-08-15)
      During three cruises in April, May and November 2014 in Porsangerfjord, northern Norway, the role of hydrography and phytoplankton composition in shaping zooplankton vertical distribution was studied. Simultaneous collection of biological (phytoplankton and zooplankton distribution/abundance) and environmental data (temperature, salinity, density, Chlorophyll a) was sampled using a high-resolution ...
    • Atlanterhavslaks (salmo salar L.) i Målselva : gytevandring og fordeling av gytefisk 

      Johansen, Narve Stubbraaten (Master thesis; Mastergradsoppgave, 2010-11-30)
      Sommeren 2009 fisket vi med kilenøter innerst i Malangen. Den eldste laksen ble fanget først. For den eldste gruppen (tresjøvinterlaks) kom også hunnene inn før hannene. Vi radiomerket 111 laks, og 82 % av disse ble senere registrert i Målselva. Av de øvrige merkede laksene ble det registrert gjenfangster både i sjø og elv, helt fra Vefsna i sør til Tana i nord. De radiomerkede laksene vandret ...
    • Autumn senescence response to a changing climate: effects of snow-depth on High Arctic plants 

      Abbandonato, Holly (Master thesis; Mastergradsoppgave, 2014-05-15)
      Temperature and precipitation in the Arctic are projected to increase over the next century with a changing climate. Understanding how tundra plants respond to this change is still unclear. Little is known about autumn senescence in the Arctic and with a short growing season, timing is critical. If a plant senesces too early, it compromises photosynthetic activity and growth. If a plant senesces ...