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norskFakultet for biovitenskap, fiskeri og økonomi: Nye registreringer
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Shifting invertebrate distributions in the Barents Sea since pre-1900
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-23)Marine invertebrate habitats are experiencing warming, and oceanic carbon dioxide levels are on the rise. These changes result in shifts in species distributions. Monitoring and understanding these shifts provides vital information because each species plays a unique ecological role, and the human utilization of marine species is intrinsically linked to their geographic locations. Here, we ... -
c-fos induction in the choroid plexus, tanycytes and pars tuberalis is an early indicator of spontaneous arousal from torpor in a deep hibernator
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-23)Hibernation is an extreme state of seasonal energy conservation, reducing metabolic rate to as little as 1% of the active state. During the hibernation season, many species of hibernating mammals cycle repeatedly between the active (aroused) and hibernating (torpid) states (T–A cycling), using brown adipose tissue (BAT) to drive cyclical rewarming. The regulatory mechanisms controlling this process ... -
Trade-off between drag and catch performance when designing zooplankton trawls
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-10)The aquaculture sector is in pursuit of sustainable and cost-effective raw materials for feed, and the copepod Calanus finmarchicus is a marine zooplankton species of commercial interest because of its high abundance in northern areas. These copepods have the potential to meet the demand for vast quantities of marine raw materials. However, the lack of an energy- and catch-efficient trawl technology ... -
Hypothalamic tanycytes as mediators of maternally programmed seasonal plasticity
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-01-12)In mammals, maternal photoperiodic programming (MPP) provides a means whereby juvenile development can be matched to forthcoming seasonal environmental conditions.<sup>1–4</sup> This phenomenon is driven by in utero effects of maternal melatonin<sup>5–7</sup> on the production of thyrotropin (TSH) in the fetal pars tuberalis (PT) and consequent TSH receptor-mediated effects on tanycytes lining ... -
Spatial and temporal patterns of mesozooplankton secondary production in the northern Barents Sea: Are small copepods important?
(Doctoral thesis; Doktorgradsavhandling, 2024-10-31)Measurements of secondary production—the generation of heterotrophic biomass over time—are scarce in Arctic marine ecosystems but crucial for studying food web dynamics. Large, lipid-rich copepods of the genus Calanus dominate Arctic mesozooplankton biomass, while small copepods (<2 mm adult size) are most abundant yet understudied due to study biases. This PhD thesis aimed to 1) elucidate spatial ... -
Atlantic salmon type I interferon genes revisited
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-12)Type I interferons (IFN–I) play a pivotal role in vertebrate innate immunity against viruses. This study is an analysis of IFN-I genes in an updated version of the Atlantic salmon genome published in 2021 (version Ssal_v3.1), revealing 47 IFN-I genes in the Atlantic salmon genome. The GH1 locus of chromosome (Chr) 3 harbors 9 IFNa genes, 5 IFNb genes, 6 IFNc genes, 11 IFNe genes and 1 IFNf gene. ... -
Biophysical characterization of summer Arctic sea-ice habitats using a remotely operated vehicle-mounted underwater hyperspectral imager
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-08)The impact of a rapidly shifting sea-ice cover on climate, ecosystem processes and biophysical habitat properties is not yet fully understood, particularly in the central Arctic Ocean, due to a lack of spatially representative observations. From June to July 2020 during the year-long Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC, leg 4) in the Transpolar Drift, we ... -
Organic salmon farming–A profitable differentiation strategy
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-10)This study examines the financial performance of six Norwegian salmon farming companies to investigate the benefits of differentiation through organic salmon production. Utilizing panel data from 2009 to 2020, the study analyses return on sales, prices, and production costs. The results show that the company that has differentiated parts of its production into organic salmon consistently ... -
Walking sideways? Management of the Norwegian snow crab fishery
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-03)The snow crab (Chionoecetes opilio) in the Barents Sea is an invasive species, first discovered in 1997. Since 2012, a commercial fishery has developed, and various management measures have been implemented. Despite fishing gear restrictions, limits for the catch season and the implementation of a TAC-regime in 2017 onwards, the fishery struggles with substantial sustainability challenges. ... -
Parasitic dodder expresses an arsenal of secreted cellulases with multi-substrate specificity during host invasion
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-04-17)Cuscuta campestris is a common and problematic parasitic plant which relies on haustoria to connect to and siphon nutrients from host plants. Glycoside hydrolase family 9 (GH9) cellulases (EC 3.2.1.4) play critical roles in plant cell wall biosynthesis and disassembly, but their roles during Cuscuta host invasion remains underexplored. In this study, we identified 22 full-length GH9 cellulase ... -
Biodiversity Baseline of the Norwegian Coastline Using eDNA Metabarcoding
(Master thesis; Mastergradsoppgave, 2024-06-21)Using eDNA metabarcoding on sea water samples collected along the entire Norwegian coastline in collaboration with FDIR, in the three governmental management plan regions of Barents Sea-Lofoten, Norwegian Sea and North Sea-Skagerrak -
Diving into the diet of sperm whales (Physeter macrocephalus) off the northern Norwegian coast: Insights from fecal DNA metabarcoding
(Master thesis; Mastergradsoppgave, 2024-05-15)Sperm whales are elusive creatures; they spend much of their time out of sight, deep in the oceans. This makes them difficult to study, and previously, studies of their diet have mainly been stomach content analyses of stranded or caught individuals. However, DNA metabarcoding has the potential for solving this problem. This thesis examines the diet of sperm whales in the Norwegian Sea, of which we ... -
Selective Isolation of Actinobacteria from Marine Invertebrates: A Bio-Prospective Search for New Producer Strains
(Master thesis; Mastergradsoppgave, 2024-05-15)Actinobacteria are spore-forming Gram-positive bacteria, with high G-C content in their genome. Their ability to metabolize complex compounds helps them survive different environmental conditions and form diverse associations with different organisms. These characteristics make Actinobacteria good producers of natural products with useful bioactivity. However, Actinobacteria are slow growers and ... -
Klimaanalyse av lakseoppdrett med hybride løsninger ved Alsaker Fjordbruk A/S
(Master thesis; Mastergradsoppgave, 2024-05-14)Denne masteroppgaven undersøker effekten av innføring av hybride løsninger i lakseoppdrett for et norsk oppdrettsselskap, med sikte på å få en forståelse av hvordan innføringen av hybride løsninger kan påvirke klimagassutslipp. Oppgaven fokuserte spesielt på Scope 1- og Scope 2 utslipp fra Alsaker Fjordbruks aktiviteter, inkludert direkte utslipp fra oppdrettsanlegg og indirekte utslipp fra ... -
To keep or not to keep track of time in eternal sunshine? Diel activity patterns of Svalbard arthropods during polar day
(Master thesis; Mastergradsoppgave, 2024-02-15)Organisms on Earth are exposed to cyclic changes in environmental variables due to Earth’s rotation around it’s axis. As a response, many organisms adapt their behaviour in a rhythmic manner, which is often cued by 24h light-dark cycles. However, in the Arctic, traditional 24h light- dark cycle cues do not exist for long periods at the time. Arthropods play an important role in the high latitude ... -
Hvilke erfaringer og refleksjoner gjør kvinner i fiskeriorganisasjonene seg om betydningen av kjønn for rekruttering og arbeid i organisasjonene? Hvordan er prosessene i fiskeriorganisasjonene kjønnede?
(Master thesis; Mastergradsoppgave, 2023-11-14)Tematikken i denne masteroppgaven handler om kvinners underrepresentasjon i de styrende organer i organisasjonene innenfor fiskerinæringen. Formålet har vært å få innsikt i hvordan kvinner opplever å være en minoritet i faglag og salgslag, organisasjoner som til all tid har vært dominert av menn. Jeg har valgt et teoretisk perspektiv basert på kjønn, noe som har bidratt til å utforme problemstillingen ... -
Taxonomic accuracy and complementarity between bulk and eDNA metabarcoding provides an alternative to morphology for biological assessment of freshwater macroinvertebrates
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-16)Determining biological status of freshwater ecosystems is critical for ensuring ecosystem health and maintaining associated services to such ecosystems. Freshwater macroinvertebrates respond predictably to environmental disturbances and are widely used in biomonitoring programs. However, many freshwater species are difficult to capture and sort from debris or substrate and morphological identification ... -
Declining calcium concentration drives shifts toward smaller and less nutritious zooplankton in northern lakes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-03)Zooplankton community composition of northern lakes is changing due to the interactive effects of climate change and recovery from acidification, yet limited data are available to assess these changes combined. Here, we built a database using archives of temperature, water chemistry and zooplankton data from 60 Scandinavian lakes that represent broad spatial and temporal gradients in key parameters: ... -
Management strategy evaluation for northern shrimp in the Barents Sea (ICES subareas 1 and 2)
(Research report; Forskningsrapport, 2024-09-02)To establish a management plan for northern shrimp (Pandalus borealis) in the Barents Sea, the Norwegian-Russian Fisheries Commission requested in 2023 a proposal for a harvest control rule (HCR). Based on discussions with stakeholders, six different HCRs were defined and evaluated against three performance criteria: 1. precautionarity (less than 5% risk of falling below limit reference point for ... -
3D imaging shows nano- and microparticles are internalized by salmon skin and corneal epithelial cells
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-18)The rising problem of plastic pollution is becoming one of the major environmental issues for the world. In the ocean, plastics undergo degradation into smaller microplastics (MPs) and nanoplastics (NPs). Wild fish and farmed salmon would likely be exposed to these NPs and MPs both through skin and through skin wounds. Keratocyte cells, located in the skin epithelial layer, are scavenger cells which ...
