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norskBlar i tittel Mastergradsoppgaver i biologi
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Makroalgesamfunn i littoralsonen på fem lokaliteter i Troms - endringer langs en enksponeringsgradient og endringer de siste 25 år
(Master thesis; Mastergradsoppgave, 2008-06-05)Formålet med denne oppgaven var å se på kvantitative endringer av makroalge- og lavsamfunnet i littoralsonen på fem lokaliteter i Troms, langs en eksponeringsgradient fra fjord til kyst. Ofte finner man samfunnsendringer innover i fjordene som er nært korrelert med forandringer i substratets stabilitet, tekstur og lokaltopografiske forhold i fjæra (helning) (pers. med. Tor Eiliv Lein). Artsdiversiteten ... -
Marine growth of introduced pink salmon (Oncorhynchus gorbuscha) caught in northern and central Norway
(Master thesis; Mastergradsoppgave, 2022-05-16)The introduction of pink salmon in the White Sea area during the second half of the 20th century has resulted in the establishment of a self-sustaining population of pink salmon in rivers draining to the Barents Sea and North Atlantic Ocean. The size and abundance of pink salmon is dependent on survival during the marine phase, where they acquire more than 95% of their body weight. Investigating ... -
The Marine Plastic Microbiome: Microbial Colonization of Polymer Surfaces in the Arctic Marine Environment
(Master thesis; Mastergradsoppgave, 2018-09-25)While the sources and fates of plastic pollution are receiving growing attention, major knowledge gaps exist. Among these, microbial degradation (aka biodegradation) of plastics remains poorly investigated. The process of biodegradation begins with the formation of biofilm on the polymer surface; our study aimed to investigate microbial colonization of polymer surfaces in the Arctic marine environment ... -
The mating strategy of female Svalbard reindeer
(Mastergradsoppgave; Master thesis, 2009-08-15)The mating system of Svalbard reindeer was studied in detail on Nordenskiöld land, Svalbard during the mating season 2007. Little is known about the female mating systems of Svalbard reindeer. The aims of the study were to investigate the composition of harems in relation to male attractiveness, harem size and reproductive history and the associated behaviour of females. The movement patterns of ... -
Melt season dynamics in a High Arctic estuarine tidal flat: A microbial perspective
(Master thesis; Mastergradsoppgave, 2022-05-16)The substantial influx of freshwater to High Arctic coastal ecosystems influences nutrient, organic matter, and sediment dynamics, stratification, and light availability throughout the melt season. These changes shape pelagic microbial community composition and functioning, though little is known about impacts on nearshore benthic bacteria. Globally, mudflats are hotspots for biogeochemical cycling, ... -
Mercury in fish from a subarctic watercourse and its relation to trophic ecology
(Master thesis; Mastergradsoppgave, 2020-11-16)Mercury (Hg) contamination in aquatic ecosystems is a serious concern because it can bioaccumulate and biomagnify to harmful concentrations within a food web and consequently end up in humans that eat polluted fish. The Pasvik watercourse, located in the border area between Norway, Finland and Russia, is strongly affected by the emissions of heavy metals from nearby Russian metallurgic smelters. In ... -
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)
(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 ... -
The metabolism of lean and fat hooded seal pups (Cystophora cristata): how fat contributes to the total metabolic rate
(Master thesis; Mastergradsoppgave, 2021-05-17)Hooded seal pups are highly adapted to their proximate environment from the moment they are born. They are born with a substantial blubber layer, and they gain 20+ kg of body mass during their short nursing-period (2-4 days). With the body mass gained during nursing mainly being a result of fat deposition, it made them an excellent model to use when studying the fat metabolism and its contribution ... -
Metabolomic and genomic investigation of two North-Norwegian cyanobacterial isolates for bioprospecting of new compounds
(Master thesis; Mastergradsoppgave, 2022-02-15)Cyanobacteria are an excellent source of bioactive natural products that can be used in the development of new medicinal drugs. The cyanobacterial genus Nostoc have proven to be prolific producers of molecules with exciting bioactivities, including anti-bacterial, anti-fungal, and anti-cancerous. This feature combined with the Nostoc’s complex life cycle and sizeable genomes make them interesting ... -
Metabolomic and metagenomic study of Lake Baikal diseased sponges
(Master thesis; Mastergradsoppgave, 2020-08-15)Widespread mortality and disease are recognized as growing problems in benthic marine coral and sponge communities across the globe and despite being extensively studied, in most cases the etiology of disease remains unknown. Since 2011, sponge communities in freshwater Lake Baikal, Siberia, Russia have been affected by an unknown agent of disease, which has been causing an array of physical disease ... -
Methane emissions from reindeer - do reindeer fed lichens emit less methane than reindeer on a pelleted feed diet?
(Master thesis; Mastergradsoppgave, 2012-11-18)Microbial fermentation in the world domesticated ruminant populations is thought to be responsible for as much as 13.5-33% of the global anthropogenic methane (CH4) emissions (World Resources Institute 2005, EPA 2004, Bodas et al., 2012). However, methane also represents a loss of 2-15% of the gross energy intake in these animals (Blaxter and Clapperton 1965, Holter and Young 1992, Johnson and Ward ... -
Microbial responses to warming and seasonal temperature changes in sub-Arctic forest and grassland soils
(Master thesis; Mastergradsoppgave, 2023-05-15)Atmospheric carbon dioxide (CO2) levels and global temperatures have increased steadily over the past 100 years (IPCC, 2018). Greenhouse gases, such as CO2, and their emissions from soils play an important role in shaping future climate scenarios. Soil microorganisms are responsible for the turnover of soil organic matter and the release of CO2 to the atmosphere (Hartley et al., 2008), thereby ... -
Microplastics Accumulation in Recirculating Aquaculture Systems (RAS)
(Master thesis; Mastergradsoppgave, 2023-05-14)It has in recent years been a shift in the land-based aquaculture production from flow through systems (FTS) to recirculating aquaculture systems (RAS). With emerging use of RAS, it is necessary with knowledge regarding potential issues, whereas one potentially increasing problem is accumulation of microplastics (MP) in the RAS water. The objects of this study were to determine MPs concentration in ... -
Migration and habitat use of sea trout post-smolts Salmo trutta in a Norwegian fjord system
(Master thesis; Mastergradsoppgave, 2015-05-20)The migration and habitat use of sea trout post-smolts were investigated in a fjord system in Central Norway during the period from 30 April – 26 November 2014. The main aims were to investigate timing of sea entry and freshwater return, return rate, marine residence time, spatial use of the fjord system and migration distance. Fifty sea trout smolts were tagged with acoustic transmitters and tracked ... -
Mitogenomic characterization and phylogenetic position of the oldest living vertebrate species - the Greenland shark (Somniosus microcephalus)
(Master thesis; Mastergradsoppgave, 2016-07-10)The Greenland shark (Squaliformes, Somniosus microcephalus) is the largest fish living in Arctic waters, but little is known about its biology. This species lives for at least 272 years and is listed as a near threatened species on the IUCN´s Red list of Threatened Species. As S. microcephalus is the oldest living vertebrate species, it is important to strive for its conservation. The aim of the ... -
Molecular biology and physiology of isolated chloroplasts from the algae Vaucheria
(Master thesis; Mastergradsoppgave, 2010-01)Sea slugs of the genus Elysia (e.g. E. chlorotica) are known for their ability to incorporate chloroplasts from the yellow-green alga Vaucheria litorea. These “kleptoplasts” stay active in the digestive tract of the sea slug for several months. Chloroplasts from Vaucheria litorea are also reported to be significantly more stable after in vitro isolation than chloroplasts of other algae or of higher ... -
Molecular study of digenean diversity in aquatic organisms in northern Norway, with a focus on the seasonality of Crepidostomum [Braun, 1900]
(Master thesis; Mastergradsoppgave, 2022-06-07)This study aimed to elucidate cryptic trematode diversity across multiple life stages in aquatic organisms. I collected samples from first intermediate hosts (bivalves), second intermediate hosts (amphipods and insect nymphs), and definitive hosts (fish), and identified them by use of molecular methods. Phylograms based on molecular markers from 28S and COI genes were used to identify nine species ... -
Monitoring anthropogenic activity in the Hardangervidda wild reindeer range. Possible applications of crowdsourced Strava-data in remote settings
(Master thesis; Mastergradsoppgave, 2021-05-31)Seen in light of the increasing interest of nature-based tourism and recreational outdoor activities in Norway the last decades (Haukeland, Grue & Veisten, 2010), spatiotemporal information on human activity in remote areas and knowledge about how this activity may affect wildlife and nature is a crucial part of a knowledge-based management (Gundersen et.al., 2011, p.14; Gundersen, Strand & Punsvik, ... -
Morphological divergence in a trimorphic population of Arctic charr (Salvelinus alpinus (L.)) in Skogsfjordvatn, northern Norway.
(Master thesis; Mastergradsoppgave, 2013-09-30)Sympatric polymorphisms are found in many freshwater fish taxa, including the salmonid Arctic charr (Salvelinus alpinus (L.)). Polymorphism is often expressed as differences in morphology, behaviour and life-history strategies, and may be driven by alternative phenotypic adaptations to resource use such as habitat and prey preferences. Morphological divergence is usually linked to different functions ... -
Morphological variation in the redfish (Sebastes spp.) complex in Norwegian waters
(Master thesis; Mastergradsoppgave, 2021-06-02)The golden redfish Sebastes norvegicus is a long-lived commercial species of redfish in the North Atlantic. Excessive harvest through decades has led to a decline in the mature population in Norwegian waters, which is currently considered to be severely depleted. Accumulating genetic evidence suggest a more complex structure within the Sebastes genus in the North Atlantic, which has recently formed ...
