Viser treff 61-80 av 5353

    • Management strategy evaluation for northern shrimp in the Barents Sea (ICES subareas 1 and 2) 

      Trochta, John Tyler; Stesko, Aleksei; Olssøn, Ragni; Danielsen, Hanna Ellerine Helle; Jenssen, Maria; Zimmermann, Fabian (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 

      Thiyagarajan, Dhivya Borra; Stette, Marie H. S.; Afzal, Muhammad Bilal; Ahluwalia, Balpreet Singh; Agarwal, Krishna; Dalmo, Roy Ambli; Wolfson, Deanna Lynn (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 ...
    • Zooplankton fecal pellet flux drives the biological carbon pump during the winter–spring transition in a high-Arctic system 

      Darnis, Gérald; Geoffroy, Maxime; Daase, Malin Hildegard Elisabeth; Lalande, Catherine; Søreide, Janne; Leu, Eva; Renaud, Paul Eric; Berge, Jørgen (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-24)
      Recent research highlighted significant marine biological activity during the Arctic winter, with poorly known implications for the biological carbon pump. We used moored instruments to (1) track the development of the pelagic food web of a high-Arctic marine ecosystem from winter to spring, and (2) assess the role of zooplanktonmediated processes in the sinking export of particulate organic carbon ...
    • Key internal drivers for an SME’s dynamic ambidextrous growth strategy: A case study of a Norwegian seafood group 

      Hannevig, Hilde Margrethe; Bertheussen, Bernt Arne (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-10-04)
      This qualitative, explorative case study presents a small and medium-sized enterprise (SME) in Norway that successfully pursued a dynamic ambidextrous growth strategy. The study applies a micro-foundation perspective and focuses on identifying and describing key internal drivers behind the group’s ambidextrous strategy. The empirical findings underscore ambidextrous owner-managers’ pivotal role ...
    • Intended Pariahs - Norway's Legal Settlement with Passive Nasjonal Samling Members after 1945. 

      Vaale, Lars-Erik; Borge, Baard Herman (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-22)
      In the wake of World War II, all previously German-occupied countries in Western Europe carried out legal settlements with those citizens suspected of treasonous collaboration with the occupier. Of these, Norway's treason trials were the most extensive, having as their basis a lower threshold for criminalisation than other countries. According to two legal decrees adopted by the Norwegian ...
    • Environmental drivers of food webs in charr and trout-dominated cold-water lakes 

      Kangosjärvi, Henna; Amundsen, Per-Arne; Byström, Pär; Finstad, Anders Gravbrøt; Power, Michael John; Sánchez-Hernández, Javier; Eloranta, Antti (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-15)
      Cold-water lakes situated in high latitudes and altitudes have pivotal socio-ecological importance both globally and locally. However, they are increasingly threatened by multiple anthropogenic stressors, such as climate change, hydropower and invasive species. The development of efficient management strategies is therefore urgently needed and requires a comprehensive understanding of the factors ...
    • How can we generate ideas for a project event and how is this process experienced? Delving into students` learning experiences and perceptions of usefulness in an idea and concept development prosess. 

      Nordahl-Pedersen, Hilde; Heggholmen, Kari (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-25)
      This study demonstrates ways of teaching creative methods in order to generate ideas for a project event and reveals project management students’ learning experiences and perceptions of usefulness during the process. Qualitative interviews were conducted with eight students on a project management course at a higher education institution in Norway. We provide a description and a detailed illustration ...
    • Calibration verification of an underwater hyperspectral imaging push broom instrument to measure light in absolute units and field demonstration 

      Schartmüller, Bernhard; McKee, David; Berge, Jørgen; Johnsen, Geir (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-16)
      The push broom design of an underwater hyperspectral imaging (UHI) instrument makes it possible to measure angle-resolved spectral radiance L(λ)in a plane. We describe the characterization of a commercial UHI instrument (UHI-4, Ecotone AS, Norway) and the spectral, geometric, and radiometric calibration transfer for measuring L(λ) in absolute units [µW cm<sup>−2</sup> nm<sup>−1</sup> sr<sup>−1</sup> ]. ...
    • Exploring land use conflicts arising from economic activities andtheir impacts on local communities in the European Arctic 

      Živojinović, Ivana; Elomina, Jerbelle; Pülzl, Helga; Calanasan, Karen; Dabić, Isidora; Ólafsdóttir, Rannveig; Siikavuopio, Sten Ivar; Iversen, Audun; Robertsen, Roy; Bjerke, Jarle W.; Engen, Sigrid; Tømmervik, Hans; Bogadóttir, Ragnheidur; Moioli, Sara; Tuulentie, Seija; Rautio, Pasi; Lynge-Pedersen, Kristine; Lidestav, Gunn; Edvardsdóttir, Anna Guðrún; Nygaard, Vigdis (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-30)
      The European Arctic is commonly thought of as a pristine and homogeneous area. In reality, it is a diverse region experiencing growth relying on natural resource extraction. Despite local communities being primarily affected by industry activities, most socioeconomic impact assessments are conducted at the macro level. This study addresses this gap by examining the impacts of economic activities ...
    • Ecosystem risk from human use of ocean space and resources: a case study from the Norwegian coast 

      Aarflot, Johanna Myrseth; Bjørdal, Vilde Regine; Dunlop, Katherine Mary; Espinasse, Marina; Husson, Berengere; Lindstrøm, Ulf Ove; Keulder-Stenevik, Felicia Juanita; Ono, Kotaro; Siwertsson, Anna; Skern-Mauritzen, Mette (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-30)
      Coastal and adjacent shelf waters are generally highly productive ecosystems harboring important ecological processes and exposed to a range of anthropogenic pressures from land-based and marine sectors. Ensuring that the cumulative pressures from human activities do not cause unacceptable, permanent harm to the ecosystem is challenging but crucial for sustainable management of these regions. ...
    • Genomic architecture and population structure of Boreogadus saida from Canadian waters 

      Bringloe, Trevor T.; Bourret, Audrey; Cote, David; Marie-Julie, Roux; Herbig, Jennifer; Robert, Dominique; Geoffroy, Maxime; Parent, Geneviève J. (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-20)
      The polar cod, Boreogadus saida, is an abundant and ubiquitous forage fish and a crucial link in Arctic marine trophic dynamics. Our objective was to unravel layers of genomic structure in B. saida from Canadian waters, specifically screening for potential hybridization with the Arctic cod, Arctogadus glacialis, large chromosomal inversions, and sex-linked regions, prior to interpreting population ...
    • Mixing, Water Transformation, and Melting Close to a Tidewater Glacier 

      Inall, Mark E.; Sundfjord, Arild; Cottier, Finlo; Korte, Marie-Louise; Slater, Donald A.; Venables, Emily Joanne; Coogan, James (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-15)
      Marine-terminating glacier fjords play a central role in the transport of oceanic heat toward ice sheets, regulating their melt. Mixing processes near glacial termini are key to this circulation but remain poorly understood. We present new summer measurements of circulation and mixing near a marine-terminating glacier with active sub-glacial discharge. 65% of the fjord's vertical overturning circulation ...
    • Stability and recovery of parasite communities in dynamic host environments 

      Rochat, Eloïse (Doctoral thesis; Doktorgradsavhandling, 2024-10-28)
      This thesis explores the stability and recovery of parasite communities within dynamic ecological environments, focusing on the host-parasite interactions in aquatic ecosystems. It uses Arctic charr (Salvelinus alpinus L.), a polymorphic European salmonid inhabiting diverse ecological niches, to investigate these interactions and their responses to environmental changes. The research comprises ...
    • Feathers as integrated archives of environmental stress: Direct and indirect effects of metal exposure and dietary ecology on physiological stress in a terrestrial raptor 

      Hansen, Elisabeth; Bustnes, Jan Ove; Herzke, Dorte; Bangjord, Georg; Ballesteros, Manuel; Bårdsen, Bård-Jørgen; Bollinger, Eric; Schulz, Ralf; Eulaers, Igor; Bourgeon, Sophie (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-18)
      Metal pollution is a global environmental issue with adverse biological effects on wildlife. Long-term studies that span declines in metal emissions due to regulation, resulting in varying levels of environmental contamination, are therefore well-suited to investigate effects of toxic metals, while also facilitating robust analysis by incorporating fluctuating environmental conditions and food ...
    • The nasal cavity of the bearded seal: An effective and robust organ for retaining body heat and water 

      Cheon, Hyejeong Lee; Kizilova, Nataliya; Flekkøy, Eirik Grude; Mason, Matthew J.; Folkow, Lars; Kjelstrup, Signe (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-09-10)
      We report the effects of varying physiological and other properties on the heat and water exchange in the maxilloturbinate structure (MT) of the bearded seal (Erignathus barbatus or Eb) in realistic environments, using a computational fluid dynamics (CFD) model. We find that the water retention in percent is very high (about 90 %) and relatively unaffected by either cold (−30 ◦C) or warm (10 ◦C) ...
    • Insights into the nature of ichthyotoxins from the Chrysochromulina leadbeateri blooms in Northern Norwegian fjords 

      Wang, Xinhui; Fon, Mathias; Andersen, Aaron John Christian; Solhaug, Anita; Ingebrigtsen, Richard Andre; Samdal, Ingunn Anita; Uhlig, Silvio; Miles, Christopher Owen; Edvardsen, Bente; Larsen, Thomas Ostenfeldt (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-20)
      In May–June 2019, the microalga Chrysochromulina leadbeateri caused a massive fish-killing event in several fjords in Northern Norway, resulting in the largest direct impact ever on aquaculture in northern Europe due to toxic algae. Motivated by the fact that no algal toxins have previously been described from C. leadbeateri, we set out to investigate the chemical nature and toxicity of secondary ...
    • Seasonal food intake and energy balance: Neuronal and non-neuronal control mechanisms 

      Appenroth, Daniel; Cazarez Marquez, Fernando (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-06-22)
      Animals inhabiting temperate and high latitudes undergo drastic seasonal changes in energy storage, facilitated by changes in food intake and body mass. Those seasonal changes in the animal’s biology are not mere consequences of environmental energy availability but are anticipatory responses to the energetic requirements of the upcoming season and are actively timed by tracking the annual ...
    • Soundscape characteristics of RAS tanks holding Atlantic salmon (Salmo salar) during feeding and feed withdrawal 

      Helberg, Gaute A.N.; Anichini, Marianna; Kolarevic, Jelena; Sæther, Bjørn Steinar; Noble, Christopher (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-07-03)
      Behavioural monitoring can provide crucial information on welfare and feeding in aquaculture. Passive acoustic monitoring of behaviour can be particularly useful in recirculating aquaculture systems (RAS), as they often have turbid water that impairs visual monitoring. Currently, little is known about the sounds that make up the soundscapes in RAS tanks holding Atlantic salmon (Salmo salar). ...
    • High uptake of sympagic organic matter by benthos on an Arctic outflow shelf 

      Cautain, Ivan J.; Last, Kim S.; Bluhm, Bodil Annikki Ulla Barbro; Renaud, Paul Eric; McKee, David; Narayanaswamy, Bhavani E. (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-08-07)
      On Arctic shelves, benthic food-webs are tightly linked to overlying primary production. In the seasonal ice zone, sympagic (ice-associated) primary production can be a major source of carbon for the benthos on productive inflow shelves. However, the role of sympagic organic matter is less well-understood in food webs of heavily ice-covered, less- productive outflow shelves, such as the northeast ...