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norskFakultet for biovitenskap, fiskeri og økonomi: Recent submissions
Now showing items 1221-1240 of 5233
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Bærekraft i oppdrettskonsepter: Hva er bærekraftig oppdrett og hvor bærekraftig er ulike oppdrettskonspeter?
(Master thesis; Mastergradsoppgave, 2022-05-16)Vekst i norsk lakseoppdrett har ført til et økende fokus på bærekraft, etterfulgt av en oppgang i utvikling av nye oppdrettskonsepter for å løse utfordringene dagens næring står ovenfor. En tydelig forståelse i definisjon og operasjonalisering av bærekraft er avgjørende for riktig veivalg fremover. En forståelse som vil gjøre vurderinger og valg av ulike oppdrettskonsepter i et bærekraftaspekt enklere ... -
Seabed minerals in Norway. An analysis of conflicts and sustainability issues.
(Master thesis; Mastergradsoppgave, 2022-05-16)The increasing demand for metals for use in renewable technologies and electronics has led to a surge in the interest in the minerals found on the seabed. The demand is driven by the need for green technologies to reach climate goals, population growth, and environmental, social, and economic challenges with today’s mining methods on land. Deep-sea mining is an industry still in its infancy, and ... -
Å opparbeide endringskapasitet i en sykehusorganisasjon. En kvalitativ undersøkelse av endringsarbeid i en sykehusavdeling
(Master thesis; Mastergradsoppgave, 2020-06-19)Temaet for denne studien er endringskapasitet i offentlige organisasjoner der mange organisasjoner ofte står i flere endringsprosesser samtidig. Hensikten er å få økt forståelse og kunnskap om hvordan organisasjoner som sykehussektoren håndtere endringer, samtidig som de må ivareta den daglige driften. I tillegg vil studien belyse hvordan et dynamisk begrep som endringskapasitet kan tilpasse seg ... -
Environmental drivers of population-level variation in the migratory and diving ontogeny of an Arctic top predator
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-02)The development of migratory strategies that enable juveniles to survive to sexual maturity is critical for species that exploit seasonal niches. For animals that forage via breath-hold diving, this requires a combination of both physiological and foraging skill development. Here, we assess how migratory and dive behaviour develop over the first year of life for a migratory Arctic top predator, the ... -
Mid-summer vertical behavior of a high-latitude oceanic zooplankton community
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-18)Vertical behavior, such as diel vertical migration (DVM) and swarming are widespread among zooplankton. At higher latitudes, synchronized DVM is mostly absent during summer and predominantly herbivorous copepods tend to form large near-surface swarms. This behavior is risky because it can make them vulnerable to visual predators. Here, we used ca. 12 days of mid-summer (28 June to 10 July 2018) ... -
Increasing catch efficiency for Nephrops in deep-water shrimp (Pandalus borealis) trawl fisheries
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-14)In Skagerrak and the North Sea, coastal vessels harvest deep-water shrimp (Pandalus borealis) in a mixed fishery, in which catches of Nephrops (Nephrops norvegicus) are of economic importance for the fleet. Fishermen targeting shrimp in this area must use a sorting grid with a maximum bar spacing of 19 mm, which means that only the smallest Nephrops can pass through the grid to be retained in the ... -
De unge vil lære å lage spennende torskemiddager
(Journal article; Tidsskriftartikkel, 2022-05-24)Sjømatkonsumet blant våre unge voksne fortsetter å synke. En Nofima-undersøkelse indikerer at konsumet kan økes hvis de blir inspirert til å lage spennende retter med hvit fisk. -
Antimicrobial peptides in sea urchins. Isolation, characterization and expression
(Doctoral thesis; Doktorgradsavhandling, 2010)<p>Echinoderms are interesting animals for biodiscovery/bioprospecting as sources for novel compounds that have interesting activities. These compounds might be developed into potential drug candidates. In this work, two novel families of short proteins, referred to as antimicrobial peptides (AMPs) were isolated and characterized from the sea urchin, <i>Strongylocentrotus droebachiensis</i>. One of ... -
Diagnostikk av parasittsykdommer
(Journal article; Tidsskriftartikkel, 2022)Parasitter er alle snyltere, men de tilhører svært ulike grupper og har et mangfoldig levesett! -
Tracking decision-making of backcountry users using GPS tracks and participant surveys
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-06-03)Snow avalanches are a significant natural hazard representing the primary risk of death to backcountry travelers in many alpine countries. Careful use of backcountry terrain through effective decision making can mitigate the risk of dangerous snowpack conditions, but requires relevant knowledge and experience. We present the results from a large-scale crowd sourced data collection method from ... -
Temporal Trends of Organochlorine and Perfluorinated Contaminants in a Terrestrial Raptor in Northern Europe Over 34 years (1986–2019)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-03-21)Fourteen legacy organochlorine (OC) contaminants and 12 perfluoroalkyl substances (PFASs) were measured in eggs of tawny owls (Strix alueco) in central Norway (1986–2019). We expected OCs to have reached stable equilibrium levels due to bans, and that recent phase-out of some PFASs would have slowed the increase of these compounds. ∑OC comprised on average approximately 92% of the measured compounds, ... -
Congruent responses to weather variability in high arctic herbivores
(Journal article; Tidsskriftartikkel; Peer reviewed, 2012-09-26)Assessing the role of weather in the dynamics of wildlife populations is a pressing task in the face of rapid environmental change. Rodents and ruminants are abundant herbivore species in most Arctic ecosystems, many of which are experiencing particularly rapid climate change. Their different life-history characteristics, with the exception of their trophic position, suggest that they should show ... -
Temporal correlations among demographic parameters are ubiquitous but highly variable across species
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-24)Temporal correlations among demographic parameters can strongly influence population dynamics. Our empirical knowledge, however, is very limited regarding the direction and the magnitude of these correlations and how they vary among demographic parameters and species’ life histories. Here, we use long-term demographic data from 15 bird and mammal species with contrasting pace of life to quantify ... -
Unexpected feeding behaviour inferred by DNA metabarcoding of Barents Sea skates
(Master thesis; Mastergradsoppgave, 2022-05-18)Feeding studies give an indication about the role and position of species within ecosystems and provide crucial knowledge for management. Traditional methods are based on morphological identification of prey. DNA metabarcoding is a promising tool that allow for identification of specific prey items, also when highly digested. A total of 63 stomachs from three skate species caught in the Barents Sea ... -
Neighbourhood watch among common eiders (Somateria mollissima) – Does group nesting reduce nest predation?
(Master thesis; Mastergradsoppgave, 2022-05-16)Colony nesting is thought to be an example of the selfish herd strategy, where aggregating behaviour may be an evolutionary adaptation to reduce the risk of predation. The common eider (Somateria mollissima) is a ground nesting sea bird susceptible to high nest predation rates through the nesting period. They often nest in groups, yet some also choose to nest solitarily. I examined whether group ... -
Phylogeny of Somniosus sleeper sharks: insights from newly sequenced mitochondrial genomes
(Master thesis; Mastergradsoppgave, 2022-05-16)Mitochondrial DNA (mtDNA) has been extensively used to explore phylogenetics since the its use became available. This science is considered useful in discerning relationships and evolutionary histories that are not possible with morphological studies alone. The sleeper sharks (genus: Somniosus) are a group of poorly understood, long-lived, iconic species whose taxonomic status within the genus have ... -
The fate of conventional and potentially degradable gillnets in a seawater-sediment system
(Journal article; Tidsskriftartikkel; Peer reviewed, 2022-05-20)Abandoned gillnets in the marine environment represent a global environmental risk due to the ghost fishing caused by the nets. Degradation of conventional nylon gillnets was compared to that of nets made of poly- butylene succinate co-adipate-co-terephthalate (PBSAT) that are designed to degrade more readily in the envi- ronment. Gillnet filaments were incubated in microcosms of natural seawater ... -
Can baleen whales be safely live-captured for studies of their physiology?
(Master thesis; Mastergradsoppgave, 2022-05-16)Studying baleen whales is challenging and complex, where observation of their habitat, sensory modalities, behavior and physiology, are infrequent and brief. The biochemical and biophysical contribution of mysticetes serve a vital role in maintaining a healthy marine ecosystem, but they are facing anthropogenic threats. Before giving any indications of how these threats affect the baleen whales, it ... -
Temporal trends in mercury concentrations in eggs of Tawny owl (Strix aluco) from Central Norway between 1986-2019: influence of dietary ecological parameters and climate variables
(Master thesis; Mastergradsoppgave, 2022-05-18)Mercury (Hg) is considered as a global threat which is emitted in the environment through natural sources or anthropogenic activities. Emissions of mercury decreased during the last decades because of the implementation of mitigation measures. However, with the ongoing climate change, ecosystems are directly (e.g., rising temperature) or indirectly impacted (i.e., altered ecosystem by e.g., invasive ... -
Circadian disruption by light and its effect on the immune function of the Atlantic salmon (Salmo salar)
(Master thesis; Mastergradsoppgave, 2022-05-16)The Atlantic salmon (Salmo salar) is an anadromous salmonid that begins its life cycle in freshwater streams then, develops, in a process known as smoltification, into a marine-adapted fish prior to its migration to the sea. Smoltification is a photoperiod regulated process which involves extensive change in the salmons’ physiology. In recent years smoltification procedures in aquaculture has been ...
