English
norskMastergradsoppgaver i biologi
Vis alle innførsler i samlingen sortert på
Nye registreringer
-
Seasonal changes of intertidal benthic microalgae photoacclimation during the summer to mid-winter transition period on Tromsøya
(Master thesis; Mastergradsoppgave, 2024-05-15)The microphytobenthos (MPB), defined as the microscopic photosynthesizers inhabiting sediments in marine and estuarine environments, are a vital component to intertidal ecosystems. They contribute greatly to ecosystem services in many ways and are responsible for a high amount of primary productivity in their environments. Microphytobenthic abundance and community structure studies have been increasing ... -
Phylogeography and gut content of Priapulus caudatus in Norway
(Master thesis; Mastergradsoppgave, 2024-05-15)Priapulus caudatus is a marine worm in the phylum Priapulida, commonly known as penis worms. Since it was discovered, P. caudatus has had many names that are now considered synonyms. Fossils of Priapulida from the Cambrian period are found all over the world, and extant species show that there have been little changes in their morphology since the Palaeozoic. P. caudatus are found in clay/muddy ... -
Ageing and growth of the Arctic brittle star Ophiopleura borealis (Echinodermata: Ophiuroidea) from the Barents Sea and North East Greenland
(Master thesis; Mastergradsoppgave, 2024-05-15)Species inhabiting cold-water environments exhibit typically slower growth and a longer lifespan than warm-water species, implying a slowed ability to recover from natural and anthropogenic disturbances. Longevity estimates for species inhabiting the Arctic region are sparse, despite the ongoing changes and disturbances in the region. Brittle stars (Ophiuroidea) often dominate Arctic shelf ... -
Climate-driven redistribution of fish and reconfiguration of coastal food webs in Northern Norway
(Master thesis; Mastergradsoppgave, 2024-05-14)Rapid climate change at northern latitudes induces poleward redistributions of fish leading to reconfigurations in biodiversity and food webs. This thesis aims to broaden our understanding of the climate-driven biogeographical alterations in fish and the subsequent reorganization of food webs along the coast of Northern Norway. Documenting and understanding the ongoing, rapid ecological change in ... -
The impact of diet on egg, sperm, and larval quality in a spotted wolffish (Anarhichas minor, Olafsen 1772) broodstock
(Master thesis; Mastergradsoppgave, 2024-05-14)The spotted wolffish (Anarhichas minor, Olafsen 1772) has been considered as a highly attractive candidate for aquaculture since the 1990s. Low survival throughout the earliest life stages is, however, restraining the industry from reaching stable commercial levels. Broodstock diet is identified as a key factor for gamete quality. No species-specific broodstock diet has yet been developed for the ... -
The impact of spawning pink salmon (Onchorhynchus gorbuscha) on the water quality of northern Norwegian rivers
(Master thesis; Mastergradsoppgave, 2024-06-05)Since the 2017 invasion of pink salmon in northern Norwegian rivers, increasing populations of the odd-year stock have continued to return and are further expanding their range southwestwards. A relatively short time from its first invasion and the pink salmon's strictly 2-year life cycle, gives a unique opportunity to compare the pink salmon's effect on the riverine system, during a season with its ... -
Concentrations and patterns of organochlorines (OCs) and perfluoro-alkyl substances (PFASs) in eggs of two Arctic seabird species and their relationship with eggshell thickness
(Master thesis; Mastergradsoppgave, 2024-05-16)Despite the remoteness of the Arctic, long-range transport of anthropogenic organohalogenated contaminants (OHCs) has led to their detection at high concentrations in various Arctic animals for decades. Seabirds have been commonly used as biomonitors of OHCs, and the current study investigated the concentrations and patterns of organochlorines (OCs) and perfluoro-alkyl substances (PFASs) in eggs of ... -
Mapping and assessing Eelgrass (Zostera marina) distribution and growth parameters in two Ramsar-sites
(Master thesis; Mastergradsoppgave, 2024-05-15)Eelgrass (Zostera marina) is a keystone species in coastal ecosystems that provides several crucial ecosystem services such as, habitat formation, carbon sequestration, and coastal protection. This thesis aims to map and assess the distribution of eelgrass and the performance parameters, eelgrass coverage, epiphyte coverage, and shoot height at two Ramsar sites: Sørkjosleira, and Kobbevågen in ... -
Grazed vs the Ungrazed: Herbivory Effects on Leaf Nutrient Content and Chemical Defense
(Master thesis; Mastergradsoppgave, 2024-05-15)Despite growing evidence of herbivory's influence on plant nutrient dynamics in the Arctic tundra, the short-term effects on leaf nutrient and phenolics contents across different tundra habitats and dominant plant species remain underexplored. This study enhances our understanding by analyzing the impacts of a 2-year herbivore exclusion (involving Svalbard reindeer and migratory geese) on ... -
Estimating effects of river runoff, predation, and fish carcasses on intertidal macrobenthic community and food-web structure in a sub-Arctic estuary
(Master thesis; Mastergradsoppgave, 2024-05-15)Coastal benthic organisms play an essential role in many ecosystem functions, such as organic matter utilization and regeneration of nutrients. In northern Norway, coastal ecosystems experience snowmelt-induced increased river runoff in early summer, arrival of poleward migrating predators, and invasive pink salmon runs, potentially affecting macrobenthic communities and food-web structures. This ... -
Growth responses of seedlings along encroachment gradients of the allelopathic plant Empetrum nigrum
(Master thesis; Mastergradsoppgave, 2024-05-14)Empetrum nigrum is a native evergreen shrub distributed in alpine and circumpolar areas that is currently encroaching into new habitats. This is an allelopathic plant that releases secondary metabolites, which has a negative impact on seed germination and seedling growth. The species has been recorded to expand in altitude and latitude parallel to a warmer climate and is encroaching into new habitats. ... -
Spatial segregation by sympatrically breeding Antarctic and Snow Petrels.
(Master thesis; Mastergradsoppgave, 2024-05-14)Sympatrically breeding species may face intense competition for resources, which can lead to various forms of segregation to mitigate competitive pressures. Segregation of space or habitats is one possible strategy, particularly when species share similar diets and foraging behaviors. This study examines the differences in space and habitat use between Antarctic and Snow Petrels (Thalassoica ... -
Motivations and Effects of Volunteer Divers Restoring Norwegian Kelp Forests
(Master thesis; Mastergradsoppgave, 2024-05-14)Kelp forests are in decline worldwide due to increasing anthropogenic pressures. Along the coastline of Northern Norway, spanning 15,000 kilometers, sea urchins have transformed the seabed from biodiverse kelp forests into barren grounds dominated by sea urchins. To address this issue, the initiative The Guardians of the Kelp engages volunteer divers in Northern Norway in monthly clearing events to ... -
Arctic Shrub Expansion: Implications for Stream Benthic Invertebrate Community Structure & Function
(Master thesis; Mastergradsoppgave, 2024-05-15)The Arctic is rapidly warming and this increase in temperature has been found to drive range expansion of tall shrubs in the Arctic tundra ecosystems. Although the consequences of shrub expansion have been studied in the terrestrial tundra, effects on tundra stream ecosystems remain understudied. Riparian tall shrubs, such as willows, can provide stream ecosystems with leaf litter and shade, enhancing ... -
Maturation patterns and genetic diversity of the spinytail skate Bathyraja spinicauda
(Master thesis; Mastergradsoppgave, 2024-05-14)With the expansion of fisheries into deeper waters and climate change, it is increasingly important to determine the status of the species affected by these changes. One of these species is the spinytail skate Bathyraja spinicauda, an understudied skate species with vulnerable life history traits such as slow maturation and a low number of offspring. To address the lack of basic knowledge about the ... -
Lost and Found: Reassessing Ringed Seal Abundance in a Key Fjord System in Svalbard After a 20-Year Hiatus
(Master thesis; Mastergradsoppgave, 2024-05-15)Ringed seals (Pusa hispida) in Svalbard, Norway, are thought to be declining due to the impacts of climate change in the region, particularly due to a significant reduction in the extent of landfast sea ice that they rely on for breeding. The only available survey of ringed seals in Svalbard took place in 2002, so is now over twenty years old. Here, we address this data gap by conducting UAV aerial ... -
Temporal variation in marine mammal species assemblage at South Orkney Islands revealed through passive acoustic data from 2016 and 2017
(Master thesis; Mastergradsoppgave, 2022-06-02)Passive Acoustic Monitoring (PAM) is a non-invasive method providing high- resolution information about marine mammal acoustic presence. Multi-species PAM studies can increase our understanding of temporal changes in species diversity and assemblage and is especially useful in remote areas such as the Southern Ocean. This study was based on 16 months of acoustic data spanning two austral autumns and ... -
From Trash to Treasure: The use of Lumpfish (Cyclopterus lumpus) as feed for Red King Crab (Paralithodes camtschaticus)
(Master thesis; Mastergradsoppgave, 2023-05-15)This thesis explores the potential of using farmed lumpfish (Cyclopterus lumpus), discarded from Atlantic salmon (Salmo salar L.) aquaculture industry, as a sustainable feed for juvenile red king crabs (Paralithodes camtschaticus). The red king crab has successfully established a self-sustaining population in the Barents Sea. With the red king crab being a large generalist predator, its impact on ... -
Ingestion of Tyre Crumb Rubber and Uptake of Associated Contaminants in Marine Invertebrates (Pandalus borealis) and Fish (Cyclopterus lumpus) – An Experimental Exposure Study
(Master thesis; Mastergradsoppgave, 2022-05-15)Crumb rubber (CR) produced from end of life vehicle tires is widely used on artificial sports fields and to create urban artificial surfaces. It is also used as a surrogate for tyre wear particles in experimental studies simulating the behaviour and effects of car tyre particles in the environment. It is known to contain a wide range of organic chemicals and metals, some of which are only just being ... -
Aggregative response in white-tailed eagles- an initial study of the terrestrial implications of invasive Pacific pink salmons (Oncorhynchus gorbuscha) in northern Norway.
(Master thesis; Mastergradsoppgave, 2023-05-15)Abstract The spawning population of invasive Pacific pink salmon (Oncorhynchus gorbuscha) has only continued to increase in the river systems on the Varanger peninsula in Norway, causing concerns across institutional boundaries and management communities. So far, the Norwegian research efforts on Pacific pink salmon have been centred on consequential effects in marine- and freshwater ecosystems, ...
RSS 1.0