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norskMastergradsoppgaver i biologi
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Analysis of Bacterial Communities associated with the Tidal Zone Grass Puccinellia in Response to Diesel Spills
(Master thesis; Mastergradsoppgave, 2024-11-15)Contamination from petroleum products and hydrocarbons is one of the major sources of pollution worldwide. The use of plants or microbes to reduce pollution is called bioremediation and is a cheap and environmentally friendly alternative to mechanical or chemical clean-up. A good understanding of native plants and microbes is required to implement bioremediation. In this study, the common and ... -
Physiological impact of waterborne crude oil exposure to reproducing polar cod (Boreogadus saida)
(Master thesis; Mastergradsoppgave, 2024-11-15)Climate change-driven sea ice decline is increasing access to Arctic oil reserves and shipping routes, raising the risk of oil spills. Harsh polar conditions of extreme cold, darkness, and unpredictable weather will exacerbate these risks. The polar cod (Boreogadus saida), a key species in the Arctic ecosystem, may be particularly affected. With its spawning window in January and February, an oil ... -
Studier av opptak av fiskepatogene bakterier i keratocytter fra laks og «Atlantic salmon kidney» (ASK) celler
(Master thesis; Mastergradsoppgave, 2023-12-01)Hudsår har blitt mer utbredt i norsk lakseoppdrett de senere år, hvor årsakene kan være flere og sammensatte. Vintersår regnes som en av de største helseutfordringene, der klassiske vintersår knyttes til bakterien Moritella viscosa. Hudsår hos oppdrettsfisk kan også skyldes sammensatt infeksjon med flere bakterier hvor bakteriene Vibrio anguillarum, Vibrio salmonicida og Aeromonas salmonicida, som ... -
Screening for viruses using unicellular eukaryotes as hosts
(Master thesis; Mastergradsoppgave, 2023-11-15)This master’s project delves into the microbial diversity of the Arctic region, with focus on the isolation and characterization of a yeast of the Cystobasidium genus and likely viruses capable of infecting it. The research also shows preliminary results pointing at the movement and chemotaxis capabilities of the yeast, presenting findings that have the potential to shape our understanding of microbial ... -
Characterization of Monocarboxylate Transporters in the Brain of the Hooded Seal (Cystophora cristata) Reveal Possible Biochemical Adaptation to Diving
(Master thesis; Mastergradsoppgave, 2024-08-29)Diving mammals are perpetually required to manage low-oxygen conditions throughout their lives. The mammalian brain is an organ particularly vulnerable to low oxygen levels due to its high energy demands, which require steady aerobic ATP production. The brain of the deep- diving hooded seal (Cystophora cristata) demonstrates remarkable tolerance to hypoxia. Studies suggest that this brain hypoxia ... -
Benthic Megafauna Biodiversity Associated to Vulnerable Marine Ecosystems in Norwegian waters
(Master thesis; Mastergradsoppgave, 2024-08-15)The biodiversity of benthos is influenced by habitat forming taxa defining Vulnerable Marine Ecosystems (VME). Such indicator taxa are used to identify and designate VME areas, but their numerical relation to benthic biodiversity is not known. In this thesis I address the relationship between abundance of VME indicator-taxa and megabenthos biodiversity in Norwegian waters. The main objectives were ... -
Feeding ecology of age-0 polar cod (Boreogadus saida) in the Greenland Sea
(Master thesis; Mastergradsoppgave, 2024-08-15)Polar cod (Boreogadus saida) play a crucial role as a key species in Arctic marine ecosystems. The importance of successful feeding of particularly their sensitive early life stages for survival and later recruitment into the adult population is known. This study investigated the diets of age-0 polar cod in the Greenland Sea (Northeast Greenland) during the summer and fall of 2017, focusing on ... -
Singers of the High Arctic; Seasonal acoustic presence of Spitsbergen bowhead whales (Balaena mysticetus) around Svalbard, Norway
(Master thesis; Mastergradsoppgave, 2024-08-15)Marine mammals throughout the circumpolar Arctic are facing profound levels of environmental change due to climate warming. Among them is the bowhead whale (Balaena mysticetus), an Arctic endemic cetacean that spends its entire life in Arctic waters and lives in tight association with sea ice habitats. The Spitsbergen bowhead whale population resides in the Northeast Atlantic, where they were hunted ... -
Foraging Behavior of Chinstrap Penguins (Pygoscelis antarctica) at the South Orkney Islands (Antarctica) during their Breeding Season
(Master thesis; Mastergradsoppgave, 2024-08-14)Chinstrap penguins (Pygoscelis antarctica) are central place foragers during their breeding season in the austral summer, which restricts the distance and duration they can forage away from their chicks. Recent studies indicate a regional decline in chinstrap penguin populations across their distribution range. During breeding, they almost exclusively feed on Antarctic krill (Euphausia superba), a ... -
Beneath the Surface: Fungal Community Associated with Brown Alga Saccharina latissima A Molecular Characterization through DNA Extraction, PCR Amplification, Nanopore sequencing and BLAST Analysis
(Master thesis; Mastergradsoppgave, 2024-08-15)Fungi can be found in every marine habitat, but our knowledge about their diversity, function, and potential is still limited Studies show that marine fungi play an important role in ecosystems by contributing to nutrient cycling and forming symbiotic relationships with marine organisms. Saccharina latissima, also known as sugar kelp, is a brown algae with a circumpolar distribution in the Northern ... -
Parasite Communities in Artic Blue Mussels - Exploring Spatial and Temporal Dynamics
(Master thesis; Mastergradsoppgave, 2024-08-14)Blue mussels (Mytilus spp.) play an important role in intertidal ecosystems along coastlines worldwide. Trematodes, which often parasitize these mollusks, can effectively alter blue mussels’ functional role in intertidal ecosystems. Due to the trematodes complicated life cycles and manifold but hidden effects on the intertidal ecosystems, they are often ignored in marine research, especially in ... -
Parasite communities in pink salmon (Oncorhynchus gorbuscha) along their invasion gradient in Norway – a cause for concern?
(Master thesis; Mastergradsoppgave, 2024-08-09)Globally, non-indigenous species (NIS) are increasing in both number and distribution. Sometimes NIS are intentionally introduced to provide food or financial gain. If NIS are moved to a new environment without their competitors, predators and parasites they may gain an advantage over native species. This is explained by the enemy release hypothesis, which also includes parasites, as NIS might lose ... -
Interactions between 0-group Saithe (Pollachius virens) and 0-group Cod (Gadhus morhua) in shallow nursery areas
(Master thesis; Mastergradsoppgave, 2024-05-14)In this study diet width and overlap between 0-group saithe (Pollachius virens) and 0-group cod (Gadhus morhua) was studied. Along with studying if habitat characteristics, length of the fish (cod and saithe), fjord distance, predator specie (cod or saithe) had an impact on the diet composition of the sampled fishes. A diet comparison between my diet findings and findings in earlier studies. The ... -
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 ... -
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 ...
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