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norskMastergradsoppgaver i biologi: Nye registreringer
Viser treff 1-20 av 425
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Growing season extension and delayed senescence: phenological responses to altered snow regimes and nutrient enrichment in High Arctic tundra species
(Master thesis, 2025)Arctic ecosystems are experiencing rapid changes in climate conditions, with a shift in snow regimes and nutrient availability, likely to impact plant phenology and productivity. This study investigates how increased snow depth and nutrient enrichment influence the timing of phenological phases and length of the growing season in tundra vegetation in Adventdalen, Svalbard. A factorial field experiment ... -
Drivers of fish parasite infracommunities in a high latitude system – a dive into host and parasite traits shaping parasite diversity
(Master thesis, 2025)Understanding the structuring drivers of host-parasite communities is central to predicting how these organisms will respond to environmental changes that are occurring at a rapid rate in northern latitude systems. Many factors shaping complex and ecologically important communities of fish-parasites in freshwater systems remain incompletely understood, particularly at the infracommunity level. Using ... -
Plastic-related chemicals associated with polymers and their effects on thyroid hormones in fledglings of Northern fulmars (Fulmarus glacialis) from Svalbard
(Master thesis, 2025)Northern fulmars (Fulmarus glacialis) are pelagic seabirds prone to ingest plastics. Upon ingestion, plastic particles can have both physical and chemical impacts, although these effects are poorly understood. This study investigated the occurrence of plastic-related chemicals (PRCs) in relation to the type of plastic polymers ingested, as well as their potential endocrine disrupting effects on ... -
Hyperspectral Imaging as a Tool for Characterization of Bilberry (Vaccinium myrtillus L.)
(Master thesis, 2025)Plants growing at high latitudes are subjected to environmental conditions with significantly different light and temperature regimes compared to lower latitudes, which can influence local adaptations related to the plant’s secondary metabolite profile. Several studies have demonstrated the potential of utilizing hyperspectral imaging in plant phenotyping. This thesis provides insight into how plant ... -
Drivers of coastal ecosystem structure: Using fishing mortality, primary production and temperature to predict biomass distributions of ecosystems along the Norwegian Coast
(Master thesis, 2025)Coastal ecosystems constitute productive marine areas that provide valuable ecosystem services such as harvestable fish stocks and critical habitats for spawning. With increasing impacts of human activities and climate change on coastal ecosystems, more knowledge about what shapes their structure is needed to manage them sustainably. Ecosystem modeling in Ecopath with Ecosim (EwE) has been widely ... -
Karakterfri vurdering i naturfag – økt forståelse eller økt usikkerhet?
(Master thesis, 2025)Denne masteroppgaven undersøker hvordan en karakterfri termin i naturfag påvirker elevers opplevelser og holdninger til vurdering. Hovedsakelig er oppgaven en komparativ studie mellom elever på to videregående skoler. For å samle inn data utviklet jeg et omfattende spørreskjema med spørsmål tilknyttet karakterfri vurdering. Spørreskjema gikk gjennom runder med redigering, og pilotundersøkelser med ... -
Investigating traditional and novel genetic markers for smoltification status in wild Atlantic salmon (Salmo salar)
(Master thesis, 2025)Atlantic salmon are anadromous fish, meaning they hatch and live their young lives in freshwater (FW), before migrating to seawater (SW) to feed and grow. The salmon must undergo physiological change to prepare for the new environment. This adaptation is called smoltification or parr-smolt-transformation (PST). One of the most obvious changes is the increasing salinity in SW. As the salmon migrates ... -
Assessing long-term changes in taxonomic and functional parasite diversity in Norwegian freshwater fish
(Master thesis, 2025)Climate change driven loss of biodiversity is occurring at an unprecedented rate, especially in vulnerable high-latitude freshwater systems. Despite the increasing recognition of parasites in ecosystems, there is a lack of long-term data on freshwater fish parasites, limiting our ability to understand changes in biodiversity of these important ecosystem players. This study investigates how freshwater ... -
CRYOPRESERVATION OF SPOTTED WOLFFISH (Anarhichas minor) SPERM EFFECTS OF EXTENDER SUPPLEMENTED WITH ASCORBIC ACID AND SUPEROXIDE DISMUTASE ON SPERM QUALITY
(Master thesis, 2025)The spotted wolffish (Anarhichas minor) holds considerable promise for cold-water aquaculture due to its high fillet yield, docile behaviour, and resistance to disease. However, reproductive constraints—including limited sperm motility, low ejaculate volume, and narrow spawning windows—impede large-scale hatchery production. Cryopreservation offers a strategic solution for overcoming these limitations ... -
The multiple roles of whale blubber, with particular consideration of thermal conductivity and chemical composition of blubber in a high-Arctic species, the narwhal, Monodon monoceros.
(Master thesis, 2025)Blubber in marine mammals is a multifunctional tissue, serving critical roles in thermoregulation, energy storage, endocrine regulation, and hydrodynamics. By providing insulation against cold, acting as a dense energy reserve, secreting hormones such as leptin to regulate metabolism, and streamlining the body for efficient swimming, blubber supports survival in diverse and often extreme environments. ... -
Environmental impact and efficacy of different antifouling coatings in the Atlantic and Baltic Transition marine regions
(Master thesis, 2025)This thesis evaluates the environmental impact and efficacy of various antifouling (AF) coatings under field conditions across three marine sites in the Baltic Transition and Atlantic regions. The AF paints tested in the study included five copper-based coatings with varying copper content (6 – 32 wt% Cu2O), one alternative biocidal coating containing tralopyril and one biocide-free silicone foul ... -
Factors predicting migration patterns in the world’s northernmost moose population in Finnmark
(Master thesis, 2025)Abstract Purpose. The purpose of the study was to investigate factors predicting migration pattern in moose in Finnmark. Moose has earlier been most numerous in the central and southern part of Norway, but the moose population in Finnmark increased in the 1990’s, and has now reached a more stable state. This makes a study on how the moose behaves in a relatively new habitat of particular ... -
Seasonal dynamics in RNA:DNA ratios of marine microbial communities in a high latitude estuary
(Master thesis, 2025)Microorganisms are key players in marine ecosystems, as they form the basis of food webs and drive biogeochemical cycling. Global warming increases sea surface temperatures and the frequency of marine heatwaves, but the effect on marine microbes is still not well understood. To predict future changes of marine ecosystems, it is therefore important to understand the direct impact of increased ... -
Development and Application of an Ex Vivo Adipose Tissue-based Model from Cetacean Blubber Biopsies to Study Impacts of Stress Hormones
(Master thesis, 2025)Cetaceans serve as ecosystem engineers and sentinel species for ocean and human health. They are exposed to various anthropogenic stressors, including pollution, noise, human activities, and climate change which contribute to high levels of stress hormones such as glucocorticoids (e.g. cortisol). While stress response mechanisms are vital in the short term, prolonged exposure to stress can have ... -
Survival and predation of Atlantic salmon smolts in anadromous watersheds with lakes: a case study from the Skienselva watershed
(Master thesis, 2025)Atlantic salmon (Salmo salar) exhibit marked niche shifts between spawning and juvenile recruitment in running freshwaters and growth in marine waters. These habitat shifts necessitate long migrations which may come at a substantial cost to the population. As smolts, Atlantic salmon migrate downstream, from freshwater rivers to salty ocean environment, transitioning between two very distinct aquatic ... -
Movements, diving behavior and group fidelity of long-finned pilot whales in Northern Norway
(Master thesis, 2025)Long-finned pilot whales (Globicephala melas) are widely distributed and abundant throughout the North Atlantic and sightings have appeared to increase in coastal areas in northern Norway over the past decade. However, little is known about the dynamics and ecological drivers of their movements in this region. Therefore, we deployed 11 satellite-linked tags to determine areas of important habitat, ... -
Spatio-temporal distribution of Atlantic salmon (Salmo salar) post-smolt in Sognefjord
(Master thesis, 2025)Atlantic salmon (Salmo salar) is an anadromous fish that migrates from fresh to salt water, facing many challenges and threats throughout their life cycle, particularly during post-smolt migration through fjords. This study investigates the spatio-temporal distribution of Atlantic salmon post-smolts in Sognefjord, using data from the national monitoring program of salmon lice on wild salmonids (NALO) ... -
Assessment of plant growth under a rapid flashing light treatment and the effectiveness of hyper- and multi-spectral imaging as phenotyping tools
(Master thesis, 2025)Controlled environment agriculture, such as greenhouses, offers a promising solution to enhance local food production in Nordic regions, where long winters and limited natural light hinder year-round cultivation. This study investigates the effects of a rapid flashing light system on the growth and chlorophyll content of woodland strawberry Fragaria vesca, aiming to optimize energy use in greenhouse ... -
Impacts of Pink Salmon on the Social-Ecological System: The Tana River Community Survey
(Master thesis, 2025)Invasive alien species are major drivers of change in social-ecological systems in the world, causing changes not only in ecosystems but also affecting human systems and ecosystem services. In recent years, the Pacific pink salmon (Oncorhynchus gorbuscha) have invaded Norwegian rivers in numbers of thousands, increasing the concerns among managers regarding the impact on Norwegian ecosystems and ... -
Overwintering Calanus finmarchicus in Ullsfjord
(Master thesis, 2025)Calanus finmarchicus is a key species in the North Atlantic ecosystems that serves as an important link between primary producers and higher trophic levels, including commercially important fish. C. finmarchicus spends the unproductive time of the year overwintering in deep water layers. While it typically overwinters in deep oceanic basins, overwintering populations with high abundances have also ...
