Viser treff 565-584 av 5067

    • Can machine learning beat the Norwegian stock market? 

      Aronsen, Martin; Markussen, Christian (Master thesis; Mastergradsoppgave, 2023-05-31)
      Multiple studies on the performance of machine-learning stock portfolios have shown the efficacy of machine-learning portfolios on large stock exchanges, especially the American- and Chinese market. Fewer studies have been conducted on smaller cap markets, which consists of smaller, less-liquid investment options. The purpose of this thesis is therefore to explore the possibilities to beat the ...
    • Can morphology reliably distinguish between the copepods Calanus finmarchicus and C. glacialis, or is DNA the only way? 

      Choquet, Marvin; Kosobokova, Ksenia; Kwaśniewski, Sławomir; Hatlebakk, Maja Karoline Viddal; Dhanasiri, Anusha Krishanthi Shyama; Melle, Webjørn Raunsgård; Daase, Malin; Svensen, Camilla; Søreide, Janne; Hoarau, Galice Guillaume (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-02-10)
      Copepods of the genus <i>Calanus</i> play a key role in marine food webs as consumers of primary producers and as prey for many commercially important marine species. Within the genus, <i>Calanus glacialis</i> and <i>Calanus finmarchicus</i> are considered indicator species for Arctic and Atlantic waters, respectively, and changes in their distributions are frequently used as a tool to track climate ...
    • Can multitrophic interactions and ocean warming influence large-scale kelp recovery? 

      Christie, Hartvig C; Gundersen, Hege; Rinde, Eli; Filbee-Dexter, Karen; Norderhaug, Kjell Magnus; Pedersen, Torstein; Bekkby, Trine; Gitmark, Janne Kim; Fagerli, Camilla With (Journal article; Tidsskriftartikkel; Peer reviewed, 2019-02-14)
      Ongoing changes along the northeastern Atlantic coastline provide an opportunity to explore the influence of climate change and multitrophic interactions on the recovery of kelp. Here, vast areas of sea urchin‐dominated barren grounds have shifted back to kelp forests, in parallel with changes in sea temperature and predator abundances. We have compiled data from studies covering more than 1,500‐km ...
    • Can novel pest outbreaks drive ecosystem transitions in northern-boreal birch forest? 

      Vindstad, Ole Petter Laksforsmo; Jepsen, Jane Uhd; Ek, Malin; Pepi, Adam A.; Ims, Rolf Anker (Journal article; Tidsskriftartikkel; Peer reviewed, 2018-11-04)
      <p>1.The boreal biome exhibits distinct alternative ecosystem states with high and low levels of tree cover. Insect outbreaks facilitated by climate warming could potentially drive transitions from high to low tree cover states. We investigated whether two key premises for such outbreak‐induced transitions – critical thresholds (tipping points) and positive feedbacks that could maintain alternative ...
    • Can plastic related chemicals be indicators of plastic ingestion in an Arctic seabird? 

      Collard, France; Tulatz, Felix; Harju, Mikael; Herzke, Dorte; Bourgeon, Sophie; Gabrielsen, Geir Wing (Journal article; Tidsskriftartikkel; Peer reviewed, 2024-03-22)
      For decades, the northern fulmar (Fulmarus glacialis) has been found to ingest and accumulate high loads of plastic due to its feeding ecology and digestive tract morphology. Plastic ingestion can lead to both physical and toxicological effects as ingested plastics can be a pathway for hazardous chemicals into seabirds' tissues. Many of these contaminants are ubiquitous in the environment and the ...
    • Can private provision of primary care contribute to the spread of antibiotic resistance? A study of antibiotic prescription in Sweden 

      Granlund, David; Zykova, Yana (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-10-23)
      <p><i>Background - </i>Growing rates of antibiotic resistance, caused by increasing antibiotic use, pose a threat by making antibiotics less effective in treating infections. <p><i>Objective - </i>We aimed to study whether physicians working at privately and publicly owned health centres differed in the likelihood of prescribing antibiotics and choosing broad-spectrum over narrow-spectrum ...
    • Can spruce forest stands be adapted to climate-driven natural disturbances? The consequential effects of two key disturbance agents and their management in spruce dominated stands under climate change – A review 

      Andersson, Carl-Michael Heimo (Master thesis; Mastergradsoppgave, 2021-05-20)
      The purpose of the thesis is to support the initial stage of the Climate Smart Forestry Norway (CSFN) undertaken by a consortium between NMBU, NIBIO, LUKE (Finland), and Wageningen University & Research, which is a five-year project aimed to assess how Norway’s forests are best managed in order to adapt to climate change. As part of the CSFN project a framework for quantifying probability and effects ...
    • Can stock returns be used as a proxy for corporate bond yields? 

      Grønning, Stian Ek (Master thesis; Mastergradsoppgave, 2014-06-04)
      In this paper, I have investigated the relationship between the change in yield and stock returns for 27 firms for 47 consecutive business days. Firstly, I have found that there is an inverse relationship between the rating of firms and the degree of correlation between the stock return and the change in yield for bonds issued by the same firm. Secondly, I have not successfully managed to demonstrate ...
    • Can vertical separation of species in trawls be utilized to reduce bycatch in shrimp fisheries? 

      Larsen, Roger B.; Herrmann, Bent; Brcic, Jure; Sistiaga, Manu; Cerbule, Kristine; Nielsen, Kåre Nolde; Jacques, Nadine; Lomeli, Mark Joseph Max; Tokac, Adnan; Cuende, Elsa (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-03-26)
      Several shrimp trawl fisheries use a Nordmöre sorting grid to avoid bycatch of fish. However, small fish can pass through the grid. Therefore, the retention of juvenile fish often remains an issue during shrimp trawling. We investigated the vertical distribution of deepwater shrimp (<i>Pandalus borealis</i>) and dominant bycatch species at the point where the Nordmöre grid section is installed. This ...
    • Can waste re-cycling increase the sustainability of animal feeds? 

      Jobling, Malcolm (Journal article; Tidsskriftartikkel, 2019)
      An annual procution of over one billion tonnes, and an economic turnover in excess of $US400 billion; this is the animal feed industry. The vast majority of animal feed is given to terrestrial farm animals; those reared for meat, and those used to produce eggs and dairy products. Fish feeds make up about 5% of the total volume of animal feeds and have a 10% share of marked sales. <p> <p>It is ...
    • Can you trust someone you have never met? Swift trust and self-disclosure in temporary teams 

      Sand, May-Britt Aronsen (Master thesis; Mastergradsoppgave, 2020-08-31)
      In this thesis I ask the question “can you trust someone you have never met”. The background for this is the temporary nature of cabin crew teams which implies that it is not possible to rely on conventional trust, and to better understand how it still is possible to trust someone you have never met I have focused on factors that contribute to initial trust (or categorization) and swift trust. An ...
    • Cannibalism and protective behavior of eggs in Arctic charr (Salvelinus alpinus) 

      Frye, Marilena; Egeland, Torvald Blikra; Nordeide, Jarle Tryti; Folstad, Ivar (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-09-28)
      From video recordings of spawning events, we quantified protective and cannibalistic behavior of Arctic charr occurring immediately after spawning. The number of fish cannibalizing on stray eggs was examined regarding (a) whether more than one male shed milt during the spawning event, that is, whether sperm competition occurred, (b) whether the sperm competition included few or many males, that is, ...
    • Capability and legitimacy of beach management units (BMU's) : to improve fisher's income through management of first-hand sales system in Lake Victoria - Tanzania 

      Salehe, Mwanahamis Abdallah (Master thesis; Mastergradsoppgave, 2008-05-15)
      Depending on the particular institutional and organizational set-up, different management tasks can be suitable for different forms of co-management arrangement. This thesis focuses on examining the possibility of implementing the marketing-oriented fisheries co-management in Lake Victoria (Tanzanian side) for Nile perch fisheries. The community-based organization BMU was selected as fisher’s ...
    • The capability of square-meshes and fixed-shape meshes to control codend size selection 

      Bak-Jensen, Zita; Santos, Juan; Melli, Valentina; Stepputtis, Daniel; Feekings, Jordan P.; Herrmann, Bent (Journal article; Tidsskriftartikkel; Peer reviewed, 2023-04-11)
      Trawl codends are commonly made of diamond-mesh netting. However, diamond-mesh codends vary in mesh geometry along its length and during fishing due to catch build up. This introduces variability in the size selection process. This phenomenon compromises the rationality of regulating exploitation patterns in trawl fisheries through adjustments in codend mesh size. One technical solution often ...
    • Capture based aquaculture and sustainability 

      Eilertsen, Remy André (Master thesis; Mastergradsoppgave, 2020-11-27)
      The seasonal fisheries in Norway is both a blessing and a curse. The fisheries management have for decades tried to find a way to move some of the seasonal pressure from the traditional season to other parts of the year. This have been done with different levels of success. The duty system is an example of one of the tools that have been tried to secure the supply of fresh fish for the land industry ...
    • Car tire crumb rubber: Does leaching produce a toxic chemical cocktail in coastal marine systems? 

      Halsband, Claudia; Sørensen, Lisbet; Booth, Andy; Herzke, Dorte (Journal article; Tidsskriftartikkel; Peer reviewed, 2020-07-23)
      Crumb rubber granulate (CRG) produced from end of life tires (ELTs) is commonly applied to synthetic turf pitches (STPs), playgrounds, safety surfaces and walkways. In addition to fillers, stabilizers, cross-linking agents and secondary components (e.g., pigments, oils, resins), ELTs contain a range of other organic compound and heavy metal additives. While previous environmental impact studies on ...
    • Carbon export in the seasonal sea ice zone north of Svalbard from winter to late summer 

      Dybwad, Christine; Assmy, Philipp; Olsen, Lasse Mork; Peeken, Ilka; Nikolopoulos, Anna; Krumpen, Thomas; Randelhoff, Achim; Tatarek, Agnieszka; Wiktor, Józef M.; Reigstad, Marit (Journal article; Tidsskriftartikkel; Peer reviewed, 2021-01-21)
      Phytoplankton blooms in the Arctic Ocean's seasonal sea ice zone are expected to start earlier and occur further north with retreating and thinning sea ice cover. The current study is the first compilation of phytoplankton bloom development and fate in the seasonally variable sea ice zone north of Svalbard from winter to late summer, using short-term sediment trap deployments. Clear seasonal patterns ...
    • Carbon Footprint and Nutrient Density of Underutilized Norwegian Marine Resources 

      Langdal, Andreas (Master thesis; Mastergradsoppgave, 2021-05-21)
      Both nationally and internationally, there is a rising ambition to reduce carbon footprint to fight climate change. However, climate change should not be seen as a solitary challenge as the human population has more than tripled since the 1950ths. We are therefore moving towards the inevitable crossroad where the food needed to sustain humanity and the traditional utilized resources we have ...
    • Carbon source and trophic structure along a depth gradient in Isfjorden, Svalbard 

      Løkken, Therese Smelror (Master thesis; Mastergradsoppgave, 2013-08-29)
      Stable isotope analysis has been used to examine marine food webs since the 1980s and has become a valuable tool for studying carbon sources and trophic structures in benthic food chains in the Arctic. Prior to the present study, no one has used stabile isotope analysis to test for a difference in the main carbon source or trophic structure along a depth gradient in the Arctic. Carbon sources (pelagic ...
    • Carbon stocks and fluxes in the high latitudes: Using site-level data to evaluate Earth system models 

      Chadburn, Sarah E.; Krinner, Gerhard; Porada, Philipp; Bartsch, Annett; Beer, Christian; Belelli Marchesini, Luca; Boike, Julia; Ekici, Altug; Elberling, Bo; Friborg, Thomas; Hugelius, Gustaf; Johansson, Margareta; Kuhry, Peter; Kutzbach, Lars; Langer, Moritz; Lund, Magnus; Parmentier, Frans-Jan Willem; Peng, Shushi; van Huissteden, Ko; Wang, Tao; Westermann, Sebastian; Zhu, Dan; Burke, Eleanor J. (Journal article; Tidsskriftartikkel; Peer reviewed, 2017-11-17)
      It is important that climate models can accurately simulate the terrestrial carbon cycle in the Arctic due to the large and potentially labile carbon stocks found in permafrost-affected environments, which can lead to a positive climate feedback, along with the possibility of future carbon sinks from northward expansion of vegetation under climate warming. Here we evaluate the simulation of tundra ...