Recent additions

  • Diel activity rhythms in wild songbirds in the Subarctic 

    Staurland, Marie Østlid (Master thesis; Mastergradsoppgave, 2024-02-15)
    The highly rhythmic environment caused by the rotation of the earth has driven the evolution of an intrinsic timekeeping mechanism in most organisms known as circadian clocks. As climate change drives the expansion of southern species into northern latitudes, their circadian clocks are challenged by the novel light conditions they encounter. In contrast to the clear day and night in southern latitudes, ...
  • To keep or not to keep track of time in eternal sunshine? Diel activity patterns of Svalbard arthropods during polar day 

    Huntsaar, Maria (Master thesis; Mastergradsoppgave, 2024-02-16)
    Organisms on Earth are exposed to cyclic changes in environmental variables due to Earth’s rotation around it’s axis. As a response, many organisms adapt their behaviour in a rhythmic manner, which is often cued by 24h light-dark cycles. However, in the Arctic, traditional 24h light- dark cycle cues do not exist for long periods at the time. Arthropods play an important role in the high latitude ...
  • Establishment of killer whale cell cultures and their responses to pollutant exposure 

    Bjørneset, Juni (Master thesis; Mastergradsoppgave, 2022-03-15)
    The cosmopolitan apex predator killer whale (Orcinus orca) is one of the species worldwide with the highest levels of persistent organic pollutants (POPs) in their tissues. The knowledge of how POPs may affect the species is limited, likely due to the ethical, legal, and practical challenges of researching toxicology on free-ranging marine mammals. The use of in vitro models has proved to be a ...
  • Role of the lactate receptor HCAR1 as part of neural adaptations to hypoxia in hooded seals (Cystophora cristata) 

    Torppa, Sara (Master thesis; Mastergradsoppgave, 2023-11-15)
    To maintain normal neuronal function, the mammalian brain requires a constant supply of energy. The deep-diving hooded seal (<i>Cystophora cristata</i>) brain exhibits remarkable tolerance to extreme hypoxia, presumably involving a reduction in brain activity to lower energy demand. Thus, some neurons, circuits or even regions in the seal’s brain presumably display a neural protective shutdown ...
  • Human responses to year-round lighting using Google Trends to investigate seasonality in activity patterns and libido 

    Starck, Hedda Lærum (Master thesis; Mastergradsoppgave, 2023-11-16)
    Seasonal rhythms in humans are fascinating but studying them is inherently challenging due to the need for data that covers multiple years. Due to the experimental obstacles, it remains debated whether humans exhibit seasonal fluctuations in aspects such as activity levels and libido. To approach these topics through indirect digital measures, this thesis used multi-year data from Google Trends ...
  • Reindeer diseases associated with supplementary feeding in Norway and Sweden - A questionnaire-based survey 

    Josteinsdottir, Alfa Bachmann (Master thesis; Mastergradsoppgave, 2021-11-15)
    Climatic and anthropogenic factors are increasingly affecting reindeer husbandry in Norway and Sweden. The potential health risks associated with a warming climate, and the necessity to avoid starvation by providing supplementary feed to semi-domesticated reindeer, need to be explored and identified. A questionnaire-based survey among reindeer herders was conducted, containing questions about the ...
  • Thermal properties of arctic fox fur and the effect of fur lice infestation. 

    Henriksson, Anna Galina (Master thesis; Mastergradsoppgave, 2023-11-15)
    In 2019, a new species of sucking louse was observed in arctic foxes (Vulpes lagopus) on Svalbard and Northern Canada. Abnormal patterns of fur loss, inconsistent with normal moult, were observed across the neck, shoulders and back, raising concerns as to how the animals would cope with damaged fur during the cold Arctic winter. This study investigates the impact of these lice on Svalbard arctic ...
  • Impact of autopolyploidy on leaf structure and photosynthesis in Saxifraga oppositifolia L. 

    Hjelle, Simen Salomonsen (Master thesis; Mastergradsoppgave, 2023-12-01)
    Polyploidization can be a rapid path to speciation and is considered an important evolutionary mechanism. Some predict that all plants have undergone a polyploidization event during their evolutionary history, and the frequency of polyploid species increases with latitude. The Arctic-Alpine Saxifraga oppositifolia, an autopolyploid, has two polyploids that have successfully established themselves ...
  • Seasonal Variations in Vertical Flux of particulate matter and composition in the Northern Barents Sea 

    Hussain, Tassawer (Master thesis; Mastergradsoppgave, 2023-11-15)
    The Barents Sea is an inflow shelf sea in the Arctic Ocean which experiences climate change consequently reduction in the sea ice extent thereby significantly impacting its ecological importance. This study investigates seasonal variations in the vertical flux of particulate matter including both particulate organic matter (chl a) and particulate inorganic matterin the form of CaCO3 contributed by ...
  • The metabolic roles of astrocytes and neurons in the diving brain A study of the mitochondrial distribution in the brain of the hooded seal (Cystophora cristata) 

    Dötterer, Sari Elena (Master thesis; Mastergradsoppgave, 2023-11-15)
    The brain is highly dependent on oxygen for its metabolism and, in most mammals, major brain dysfunction occurs already within minutes of insufficient oxygen supply (hypoxia). Oxygen is the final electron acceptor in the electron transport system that drives the production of ATP through oxidative phosphorylation in the mitochondria. The rate at which oxidative phosphorylation produces ATP is dependent ...
  • Nutritious and delicious? A non-invasive study of food plant choices by Svalbard reindeer in Summer and late Autumn 

    Eikeland, Oline (Master thesis; Mastergradsoppgave, 2023-12-05)
    Seasonality affects growing patterns of vegetation and habitat use by herbivores. Short growing seasons make plants grow quickly through phenological stages which alters their nutrient levels and thus habitat use of herbivores that depend on energy assimilation in summer. Selective foraging that increases intake of high-quality forage can be highly advantageous and is usually a trade-off between ...
  • Drivers of mercury accumulation over the ontogeny of perch (Perca fluviatilis) in the subarctic Pasvik watercourse 

    Fredriksen, Julie (Master thesis; Mastergradsoppgave, 2023-11-15)
    Understanding drivers of mercury (Hg) accumulation in freshwater food webs is vital due to its ability to accumulate in organisms and magnify in food webs to potent levels, potentially impacting wildlife and human health. This is of particular concern in regions where fish serve as an important food source. This study explores drivers of Hg accumulation in European perch (Perca fluviatilis) across ...
  • Long-Term Effects on Somatic Growth, Life History Traits and Population Biology of Arctic Charr (Salvelinus alpinus) Following the Fish Culling Experiment in Takvatn 

    Indrebø, Synne Nan (Master thesis; Mastergradsoppgave, 2023-11-14)
    Stunting in fish populations is a special case of density-dependent growth characterized by old slow-growing individuals with low recreational and resource use value. The phenomenon is commonly observed in lacustrine populations of Arctic charr (Salvelinus alpinus) in temperate regions. In Takvatn, a subarctic lake in northern Norway, stunted growth of Arctic charr was attributed to food shortage ...
  • Drivers of an unexpected unimodal vertical pattern in size distribution of intertidal blue mussels (Mytilus spp.) 

    Sellæg, Victoria Eggen (Master thesis; Mastergradsoppgave, 2023-11-14)
    Blue mussels (Mytilus spp.) are important ecosystem bioengineers and provide numerous of ecosystem services. They are found worldwide, but face a global population decline for unclear reasons in many regions. A pilot study in the subarctic rocky intertidal shore in Northern Norway revealed an unexpected unimodal pattern in the body size of blue mussels along a vertical transect from low to high ...
  • Senescence and nutrients in the High Arctic 

    Isaeva, Aksana (Master thesis; Mastergradsoppgave, 2023-08-15)
    The primary focus of the study is to explore the previously unexplored relationship between nutrients and the onset of senescence in autumn.
  • Distinct change in zooplankton zoogeography in high-Arctic Isfjorden, Svalbard 

    Stürzinger, Vegard (Master thesis; Mastergradsoppgave, 2023-08-18)
    Klimaendringer påvirker arktis mer en andre områder i verden. Isfjorden på Svalbard utgjør et et utmerket modellsystem for å måle endringer i zooplanktonsammfunnet. IMOS tidserien ved Janne Søreide med kolleger har samlet in data i over 20 år, og konsekvent for flere stasjoner i de siste 8 årene. I denne master oppgaven ser jeg på hvordan zoogeografisk relativ abundans har endret seg de siste 12 ...
  • Seasonal regulation of melanogenesis in ptarmigan 

    Curthoys, Daniel (Master thesis; Mastergradsoppgave, 2023-08-08)
    Ptarmigan are one of the few animals, and only bird species, to undergo seasonal colour change. Every year they moult between a white winter morph and brown summer and autumn morphs and back again. Skin samples were collected from Lagopus muta and Lagopus lagopus during the autumn moult between brown and white morphs to compare areas with brown feathers and areas that had grown white feathers. The ...
  • Coping with change: The role of environmental parameters for Calanus lipid storage in Northeast Greenland fjords 

    Holmgren, Anita (Master thesis; Mastergradsoppgave, 2023-08-15)
    The importance of Calanus in the Arctic pelagic ecosystem is well established in the Norwegian-Arctic region. However, research on Calanus in Northeast Greenland remains limited. Calanus condition and role in the Arctic pelagic ecosystem might be different on the western side of the Fram strait because of influence from the East Greenland current that brings cold and less saline water in from the ...
  • Gyrodactylus marinus infecting the gill filaments of farmed and wild Atlantic cod in Norway 

    Haugen, Pål (Mastergradsoppgave; Master thesis, 2009-05)
    Cod aquaculture is a rapidly expanding industry in Norway and with an increase of biomass in mariculture the concern for diseases spread to and from farmed populations of cod is increasing. The genus Gyrodactylus Nordmann, 1832 are parasitic monogeneans infecting teleost fish in marine and fresh water habitats worldwide. To investigate a possible problematic species of this genus the gill filaments ...
  • Comparing seed carrier transfer ratios for start-up of moving bed biofilter reactors in recirculating aquaculture systems (RAS) 

    Hagen, Fredrik Schøyen (Master thesis; Mastergradsoppgave, 2023-06-05)
    Optimizing and documenting use of inoculation and seeding ratios for RAS start-up.

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