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  • Temporal trends of persistent organic pollutants in Svalbard polar bears (Ursus maritimus) in relation to climate-associated changes in feeding habits 

    Lippold, Anna (Master thesis; Mastergradsoppgave, 2018-05-15)
    Persistent organic pollutants (POPs) reach the Arctic ecosystems from lower latitudes mostly via air and ocean currents. They biomagnify through Arctic food webs and reach considerably high concentrations in top predators such as polar bears (Ursus maritimus). Although many of these compounds have been banned or restricted for decades, concentrations of polychlorinated byphenyls (PCBs), organochlorine ...
  • Epibenthic community structure in Northeast Greenland and the Kitikmeot Sea in the Canadian Arctic Archipelago 

    Fredriksen, Rosalyn (Master thesis; Mastergradsoppgave, 2018-05-15)
    Climate warming in the Arctic results in increased human use of Arctic shelf regions through oil and gas development and increased shipping. Such pressures necessitate the closing of knowledge gaps in poorly studied areas, here two areas located at outflow shelves in the Arctic, to record the current status of epibenthic marine ecosystems. This study characterizes epibenthic community structure, ...
  • Arctic marine microbial ecology during the Svalbard Polar Night 

    Amargant Arumí, Martí (Master thesis; Mastergradsoppgave, 2018-05-15)
    This study investigated the presence and activity of the components of the microbial food web (sepcifically viruses, heterotrophic bacteria and nanoflagellates, and autotrophic Cyanobacteria and pico-nanoflagellates) in the waters around the Svalbard archipelago (Norway) during the polar night period. The study focused on two major questions – are there differences in the community composition in ...
  • Contrasting patterns in trophic niche evolution of polymorphic Arctic charr Salvelinus alpinus L. populations in two subarctic lakes, northern Norway 

    Moccetti, Paolo Maria (Master thesis; Mastergradsoppgave, 2018-05-15)
    The trophic niche (recent and time-integrated niche estimates) of polymorphic populations of Arctic charr was investigated in two lakes in Northern Norway. The lakes, Tårnvatn and Skøvatn, have three and two morphs, respectively. Since the two systems are very similar in environmental conditions and fish communities, comparable niches between similar trophic morphs across lakes were expected caused ...
  • Reproductive ecology of female snow crab (Chionoecetes opilio) in the Barents Sea. Maturation, fecundity and brooding 

    Danielsen, Hanna Ellerine Helle (Master thesis; Mastergradsoppgave, 2018-05-15)
    The snow crab (Chionoecetes opilio, O. Fabricius 1788) relatively recently (first reports in 1996) established a population in the Barents Sea. Both the populations size and distribution area have drastically increased since then, and the species is now distributed over large parts of the northern and eastern Barents Sea, and further expansion northward and westward has been predicted. Despite an ...
  • Seasonal occurrence of Oithona similis (cyclopoida), Microsetella norvegica (harpacticoida) and Microcalanus spp. (calanoida), and productivity of O. similis, in three high-latitude Norwegian fjords. 

    Glad, Peter (Master thesis; Mastergradsoppgave, 2018-05-15)
    The Seasonal population dynamics of the small copepod species Oithona similis (cyclopoida), Microsotella norvegica (harpacticoida) and Microcalanus spp. were investigated in the northern Norwegian fjords Balsfjord, Altafjord and Porsangerfjord. In this study a WP-2 net with 64 µm mesh size was used to sample all the stages of O. similis, M. norvegica and Microcalanus spp. Copepodite stages CI – CVI ...
  • Body composition changes of hooded seal (Cystophora cristata) pups during extreme lactation 

    Guerrero, Maria Alizia (Master thesis; Mastergradsoppgave, 2018-05-15)
    Among phocids, the hooded seal has the most extreme lactation period. It lasts, for most pups, four days, making it also the shortest lactation period of any mammal. During the lactation period, there is a high energy transfer, which affects and changes the body of the pup in preparation for the following post-weaning fast period. With regard to the decline of the West Ice population, the main purpose ...
  • Predator aversion in resident generalist birds. A ghost of evolutionary past? 

    Hotvedt, Ådne (Master thesis; Mastergradsoppgave, 2018-05-14)
    Predator aversion is an important adaptation that can significantly lower the mortality rate among prey animals, but avoiding a predator requires knowing and recognizing them. The predator aversion of Common gulls and Mallard ducks at Prestvannet Lake, Tromsø, Northern Norway was tested in an experiment by placing differing objects resembling snakes next to bread during the summer and autumn of 2017. ...
  • Climate-induced range expansions of marine fauna into the Arctic – what is the most likely colonisation route? 

    Andrews, Adam Jon (Master thesis; Mastergradsoppgave, 2018-05-14)
    As a result of climate change, the Arctic faunas of the Northeast Atlantic have begun to shift in an Atlantic direction. One system exposed to such a change is the Northeast Greenland (NEG) Shelf. However, the colonisation route taken by boreal fauna to the NEG shelf is unknown. This knowledge is essential to predict to what extent boreal fauna will dominate Arctic habitats, and alter ecosystems in ...
  • Variation in egg size, fecundity and size structure in female red king crab (Paralithodes camtschaticus, Tilesius 1815) from Varangerfjorden over time. 

    Høyning, Rasmus Kristoffer (Master thesis; Mastergradsoppgave, 2018-05-14)
    The introduced red king crab (Paralithodes camtschaticus) has successfully established in Norwegian waters since its release to the Barents Sea in the 1960’s. It has become an important commercial resource contributing to the local coastal society in the eastern region of Finnmark. The fishery consists of one quota regulated area east of 26° (North Cape) and an open fishery west of 26°E. During the ...
  • Life-history strategies in two subarctic lakes with polymorphic Arctic charr Salvelinus alpinus L. populations. High across lakes stability in evolution of life-history strategies 

    Kjær, Runar (Master thesis; Mastergradsoppgave, 2018-05-13)
    Life history strategies of polymorphic Arctic charr in two sub-arctic lakes (Tårnvatn and Skøvatn) with similar environmental- and physiochemical conditions were studied. Disparities in life history traits may reflect ecological adaptations and is suggested an important factor in the incipient speciation process. In this region several lakes have polymorphic charr, and the designation of a fish to ...
  • Calving site characteristics and habitat use in Svalbard reindeer 

    Paulsen, Ingrid Marie Garfelt (Master thesis; Mastergradsoppgave, 2018-05-15)
    Migrating reindeer and caribou tend to return to traditional calving locations every spring with specific environmental conditions and protection of calving grounds is a central part of Rangifer conservation. In contrast, the non-migratory Svalbard reindeer inhabit an environment free of predators during calving season making them ideal as a reference population. Little is known about habitat ...
  • The use of telomeres as health biomarkers in sea eagle nestlings: temporal variation and indicators of pollutant exposure 

    Skotnes, Tove Hilstad (Master thesis; Mastergradsoppgave, 2018-06-15)
    Telomeres are non-coding DNA repeats located at the end of chromosomes, and have an important role in stabilizing and protecting the coding sequences in eukaryote genomes. Cell divisions leads to attrition of telomeres, which is one of the main mechanisms explaining cell senescence. Previous studies have shown that telomere length is associated with health and lifespan, and that telomere lengths can ...
  • Parasites of Northeast Arctic cod (Gadus morhua) in the Barents Sea: effects on reproduction 

    Alvestad, Anja Helene (Master thesis; Mastergradsoppgave, 2017-07-15)
    Parasites play a key role in the biodiversity and dynamics of an ecosystem, either by affecting host mortality and/or host reproduction. Spawning comes with a great cost in time and energy, and in times of poor conditions this time and energy is better directed into growth and survival to increase future success. The phenomenon of skipped spawning, where sexually mature fish skip a reproductive ...
  • Diving behaviour of humpback whales feeding on overwintering herring in North-Norwegian fjords 

    Ochoa Zubiri, Kevin (Master thesis; Mastergradsoppgave, 2017-07-06)
    Since 2011, large numbers of humpback whales have aggregated to feed on Norwegian spring-spawning herring overwintering from late October to February within the fjords of the Troms county in Northern Norway. Whale aggregations are new in this region and little information on the whales’ behaviour is available. How whales dive and forage and how they adjust to the extreme light regime at this latitude ...
  • Gjenfangst av laks (Salmo salar L.) etter fang og slipp-praksis i norske elver 

    Johansen, Martin Rognli (Master thesis; Mastergradsoppgave, 2017-05-18)
    Som følge av at norske laksebestander har blitt redusert i løpet av de siste tiårene har det blitt vanligere å gjenutsette laks i forbindelse med sportsfiske. Noen av disse gjenutsatte laksene er rapportert å gjenfanges, men omfanget av dette har hittil ikke vært dokumentert i detalj i norske elver. Slik gjenfangst kan tenkes å beskatte forskjellige deler av en populasjon ulikt, være problematisk i ...
  • Haul-out behaviour of walruses (Odobenus rosmarus) monitored by camera stations - potential impacts of tourist visitations 

    Øren, Kine (Master thesis; Mastergradsoppgave, 2017-05-16)
    The rapid growth of tourism in Polar Regions stimulates a need for investigating potential impacts on targeted species and sensitive areas, such as walrus (Odobenus rosmarus) haul-out sites. This study examines effects of tourist visitations on haul-out dynamics and site use by walruses in Svalbard, Norway. Camera stations were established at five traditional walrus haul-out sites that experience ...
  • Spawning behavior of Arctic charr (Salvelinus alpinus): spawning synchrony, vibrational communication and mate guarding. 

    Brattli, Magnus Beyer (Master thesis; Mastergradsoppgave, 2017-05-15)
    A mismatch between male and female gamete release can result in reduced or failed fertilization in external fertilizers, sperm competition and reduced paternity. Here, I video monitored spawning behavior of free living Arctic charr (Salvelinus alpinus), and analyzed details of their reproductive biology. In total, 157 spawnings were recorded. Females clearly preferred spawning with the dominant male, ...
  • Strategies for timing of nest departure in the common guillemot Uria aalge 

    Johansen, Malin Kjellstadli (Master thesis; Mastergradsoppgave, 2017-05-15)
    Duration of parental care in avian species varies widely, from altricial to precocial species. The seabird family Alcidae is unique among birds in the variation of mass and age at nest departure. The common guillemot Uria aalge exhibits an intermediate nest departure, where chicks leave the nest flightless and only at a quarter of adult body size. The aim of this study was to examine factors controlling ...
  • Estimating population trends of a riparian bird community in low-Arctic tundra. 

    Koren, Clémence (Master thesis; Mastergradsoppgave, 2018-02-15)
    In the Northern Norway tundra, willow thicket along river valleys create a more productive environment than the surrounding open tundra and host a rich community of bird species by providing food, shelter from predators and nesting site. The state of Arctic ecosystem is expected to undergo long-term changes due to opposite effects of climate change and herbivory pressure. It is also the background ...

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