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norskFakultet for biovitenskap, fiskeri og økonomi
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Handelshøgskolen ved UiT [1401]
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Physiological basis for atmospheric methane oxidation and methanotrophic growth on air
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-16)Atmospheric methane oxidizing bacteria (atmMOB) constitute the sole bio-logical sink for atmospheric methane. Still, the physiological basis allowing atmMOB to grow on air is not well understood. Here we assess the ability and strategies of seven methanotrophic species to grow with air as sole energy, carbon, and nitrogen source. Four species, including three outside the canonical atmMOB group USCα, ... -
Essential omega-3 fatty acids are depleted in sea ice and pelagic algae of the Central Arctic Ocean
(Journal article; Tidsskriftartikkel; Peer reviewed, 2023-12-19)Microalgae are the main source of the omega-3 fatty acids eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA), essential for the healthy development of most marine and terrestrial fauna including humans. Inverse correlations of algal EPA and DHA proportions (% of total fatty acids) with temperature have led to suggestions of a warming-induced decline in the global production of these biomolecules ... -
A commercial seaweed extract increases growth performance, immune responses, and related gene expressions in whiteleg shrimp (Litopenaeus vannamei)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-05-22)Seaweed liquid extracts are an attractive source of phytochemicals with high potential applicability in the aquafeed-additive industry. A commercial seaweed liquid extract (True Algae Max, TAM®), which has a marine seaweed odor, also dislplays significant levels of polysaccharides, phytochemicals, phenolic, and flavonoid compounds showing antioxidant activities and DPPH inhibition. This study ... -
Overview of the MOSAiC expedition: Ecosystem
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-21)The international and interdisciplinary sea-ice drift expedition “The Multidisciplinary drifting Observatory for the Study of Arctic Climate” (MOSAiC) was conducted from October 2019 to September 2020. The aim of MOSAiC was to study the interconnected physical, chemical, and biological characteristics and processes from the atmosphere to the deep sea of the central Arctic system. The ecosystem team ... -
Governance for Earth system tipping points – A research agenda
(Journal article; Tidsskriftartikkel, 2024-06-12)Tipping points in the Earth system could be passed within the Paris Agreement's temperature goal range (1.5°C–2°C). Tipping processes are a feature of complex Earth system dynamics that present major governance challenges not addressed by existing global governance institutions. The common governance toolkit is a poor match for dealing with tipping processes, especially non-linear change, and radical ... -
Community's ecological traits reflect spatio-temporal variability of climate change impacts
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-12)Climate change is triggering shifts in species distribution eventually altering communities’ biogeography. The composition of a community in terms of its species’ ecological niche informs of a community’s response to environmental conditions and impacts, which is central for a timely conservation. While the thermal niche has been widely explored, given it offers a direct link of warming effects ... -
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 ... -
Efficacy, persistence and residue levels of fungicides for Botrytis control in wild blueberry
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-17)Botrytis blossom blight disease is one of the major challenges to wild blueberry production with annual losses frequently exceeding 20%. In this study, the effect of different fungicide treatments on Botrytis blight development and yield, as well as the mobility and persistence of these fungicides within flower tissues, and fruit of wild blueberries were evaluated under field conditions. This ... -
Bacterioplankton taxa compete for iron along the early spring–summer transition in the Arctic Ocean
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-18)Microbial assemblages under the sea ice of the Dease Strait, Canadian Arctic, were sequenced for metagenomes of a small size fraction (0.2–3 μm). The community from early March was typical for this season, with Alpha- and Gammaproteobacteria as the dominant taxa, followed by Thaumarchaeota and Bacteroidetes. Toward summer, Bacteroidetes, and particularly the genus Polaribacter, became increasingly ... -
Mapping Potential Timing of Ice Algal Blooms From Satellite
(Journal article; Tidsskriftartikkel, 2024-04-17)As Arctic sea ice and its overlying snow cover thin, more light penetrates into the ice and upper ocean, shifting the phenology of algal growth within the bottom of sea ice, with cascading impacts on higher trophic levels of the Arctic marine ecosystem. While field data or autonomous observatories provide direct measurements of the coupled sea ice-algal system, they are limited in space and time. ... -
Path analysis reveals combined winter climate and pollution effects on the survival of a marine top predator
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-06)Marine ecosystems are experiencing growing pressure from multiple threats caused by human activities, with far-reaching consequences for marine food webs. Determining the effects of multiple stressors is complex, in part, as they can affect different aspects of biological organisation (behaviour, individual traits and demographic rates). Determining the combined effects of stressors, through different ... -
The Eurasian Arctic Ocean along the MOSAiC drift in 2019–2020: An interdisciplinary perspective on physical properties and processes
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-05)The Multidisciplinary drifting Observatory for the Study of Arctic Climate (MOSAiC, 2019–2020), a year-long drift with the Arctic sea ice, has provided the scientific community with an unprecedented, multidisciplinary dataset from the Eurasian Arctic Ocean, covering high atmosphere to deep ocean across all seasons. However, the heterogeneity of data and the superposition of spatial and temporal ... -
Marine-Derived Peptides with Anti-Hypertensive Properties: Prospects for Pharmaceuticals, Supplements, and Functional Food
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-22)Hypertension, a major health concern linked to heart disease and premature mortality, has prompted a search for alternative treatments due to side effects of existing medications. Sustainable harvesting of low-trophic marine organisms not only enhances food security but also provides a variety of bioactive molecules, including peptides. Despite comprising only a fraction of active natural compounds, ... -
Panel-based assessment of ecosystem condition as a platform for adaptive and knowledge driven management
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-13)Ecosystems are subjected to increasing exposure to multiple anthropogenic drivers. This has led to the development of national and international accounting systems describing the condition of ecosystems, often based on few, highly aggregated indicators. Such accounting systems would benefit from a stronger theoretical and empirical underpinning of ecosystem dynamics. Operational tools for ecosystem ... -
Parasites alter food-web topology of a subarctic lake food web and its pelagic and benthic compartments
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-02-07)We compared three sets of highly resolved food webs with and without parasites for a subarctic lake system corresponding to its pelagic and benthic compartments and the whole-lake food web. Key topological food-web metrics were calculated for each set of compartments to explore the role parasites play in food-web topology in these highly contrasting webs. After controlling for effects from ... -
Herbivore diversity effects on Arctic tundra ecosystems: a systematic review
(Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-25)Background Northern ecosystems are strongly influenced by herbivores that differ in their impacts on the eco‑ system. Yet the role of herbivore diversity in shaping the structure and functioning of tundra ecosystems has been overlooked. With climate and land-use changes causing rapid shifts in Arctic species assemblages, a better under‑ standing of the consequences of herbivore diversity changes for ... -
Fortrinn bygd på tilgang til viktige fiskefelt
(Master thesis; Mastergradsoppgave, 2024-06-17)Denne masteroppgaven undersøker hvordan norske fiskeres konkurransefortrinn påvirkes når de mister tilgang til viktige fiskefelt. Hensikten er å utforske hvordan internasjonale politiske endringer påvirker fiskerienes strategi og effekten av dette. Studien undersøker derfor endringer i lønnsomheten til fiskeriene ved å analysere endringer i fangstkostnader og fangstverdi knyttet til ressursen før ... -
Effects of diet and the vgll3 locus on male maturation and sperm traits of Atlantic salmon
(Master thesis; Mastergradsoppgave, 2024-06-17)A challenge in Norwegian Atlantic salmon (Salmo salar) aquaculture is unwanted early maturation in male fish. Environmental factors such as diet and genetic factors such as the vgll3 locus, are key mediators of male maturation and reproduction. In this study, different feeding treatments, alongside the vgll3 locus, was analyzed to assess their influence on maturation and sperm traits on four-year ...
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