• Adaptive radiation of the European whitefish Coregonus lavaretus (L.) in the Pasvik watercourse: the genetic description of a new morph 

      Couton, Marjorie (Master thesis; Mastergradsoppgave, 2012-11-26)
      Sympatric occurring fish morphs in postglacial lakes usually exhibit differences in morphology and physiology driven by adaptations to differential trophic niches. The European whitefish (Coregonus lavaretus (L.)) is a highly variable fish species, with more than 200 intraspecific forms described in Europe. The morphs usually differ in their number of gill-rakers, therefore this trait has been ...
    • Alternative prey choice in the pteropod Clione limacina (Gastropoda) studied by DNA-based methods 

      Kallevik, Ida Helene Funderud (Master thesis; Mastergradsoppgave, 2013-11-15)
      The gymnosome pteropod Clione limacina is regarded as a monophagous predator, feeding exclusively on the thecosome pteropod Limacina helicina in Arctic waters. C. limacina is adapted to survive periods of low food availability by long-term starvation. Although L. helicina is absent from the water, a number of other zooplankton species are present during this time. It may therefore seem surprising ...
    • An analysis of dietary variation in Icelandic arctic fox (Vulpes lagopus) over a period of 30 years using stable isotopes 

      Ellgutter, Jennifer Alejandrina Carbonell (Master thesis; Mastergradsoppgave, 2017-05-14)
      Identifying the food resources for a species is one of the basic steps towards understanding population dynamics. The arctic fox is the only terrestrial carnivore on Iceland, and the population had been increasing until recently. Therefore, it is of great importance to know what factors regulate the population growth and which resources support it to understand why the population fluctuates. In this ...
    • Annual population dynamics of the small harpacticoid copepod Microsetella norvegica in a high latitude fjord (Balsfjord, Northern Norway) 

      Antonsen, Maria Terese (Master thesis; Mastergradsoppgave, 2014-11-16)
      Annual population dynamics and vertical distribution of the small (< 0.6 mm) hapacticoid copepod, Microsetella norvegica, was investigated through monthly sampling at station Svartnes in Balsfjord, Northern Norway from May 2013 to June 2014. M. norvegica is a pelagic particle feeder, and distributed from temperate waters to sub-arctic fjords, but frequently underestimated because of its small size. ...
    • Arctic fox diet in Yamal peninsula 

      Cerezo Araujo, Maite (Master thesis; Mastergradsoppgave, 2015-05-15)
      Arctic fox in inland areas has been typically described as a species dependent on rodent populations, but being able to use alternative prey, therefore named an opportunistic specialist. Rodent populations in the low shrub tundra of southern Yamal peninsula exhibit at present low amplitude cycles. The hypothesis for this thesis is that the low abundance of small rodents is not enough to sustain ...
    • 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 ...
    • An assessment of survey methods to estimate spring density of two ptarmigan species in arctic Norway 

      Delaye, Aurélie; Strømeng, Marita Anti (Master thesis; Mastergradsoppgave, 2016-05-17)
      Both Willow ptarmigan (Lagopus lagopus) and Rock ptarmigan (Lagopus muta) are important game species in mainland Norway, but were recently added to the Norwegian Red List due to long-term population declines. Yet the knowledge about the population dynamics and the underlying drivers of both species is limited, especially for L. muta. Developing robust methods for long-term monitoring of population ...
    • An assessment of three survey methods on common bird species in low Arctic tundra.Comparing line transect distance sampling, repeated point counts and double observer point counts 

      Lindgaard, Erik Schmidt (Master thesis; Mastergradsoppgave, 2017-05-15)
      Long-term studies of bird communities in Arctic regions are rare in comparison to studies performed in temperate regions, particularly studies that takes detectability into consideration. Finding a suitable and robust method for long-term monitoring of bird populations in the low Arctic which includes a correction of imperfect detection, can contribute to increased ecological understanding and easier ...
    • Associations between herbivorous zooplankton, phytoplankton and hydrography in Porsangerfjord, northern Norway 

      Priou, Pierre (Master thesis; Mastergradsoppgave, 2015-08-15)
      During three cruises in April, May and November 2014 in Porsangerfjord, northern Norway, the role of hydrography and phytoplankton composition in shaping zooplankton vertical distribution was studied. Simultaneous collection of biological (phytoplankton and zooplankton distribution/abundance) and environmental data (temperature, salinity, density, Chlorophyll a) was sampled using a high-resolution ...
    • Atlanterhavslaks (salmo salar L.) i Målselva : gytevandring og fordeling av gytefisk 

      Johansen, Narve Stubbraaten (Master thesis; Mastergradsoppgave, 2010-11-30)
      Sommeren 2009 fisket vi med kilenøter innerst i Malangen. Den eldste laksen ble fanget først. For den eldste gruppen (tresjøvinterlaks) kom også hunnene inn før hannene. Vi radiomerket 111 laks, og 82 % av disse ble senere registrert i Målselva. Av de øvrige merkede laksene ble det registrert gjenfangster både i sjø og elv, helt fra Vefsna i sør til Tana i nord. De radiomerkede laksene vandret ...
    • Autumn senescence response to a changing climate: effects of snow-depth on High Arctic plants 

      Abbandonato, Holly (Master thesis; Mastergradsoppgave, 2014-05-15)
      Temperature and precipitation in the Arctic are projected to increase over the next century with a changing climate. Understanding how tundra plants respond to this change is still unclear. Little is known about autumn senescence in the Arctic and with a short growing season, timing is critical. If a plant senesces too early, it compromises photosynthetic activity and growth. If a plant senesces ...
    • Autumn staging behaviour in Pink-footed Geese; a similar contribution among sexes in parental care 

      Folstad, Ivar; Tombre, Ingunn M. (Master thesis; Mastergradsoppgave, 2016-05-17)
      Geese are social birds and form pairs that can last a lifetime, being together throughout the year. Forming pairs and maintaining family groups increase the individual’s social status, giving it easier access to resources and more time to exploit them. Hence, social behaviour is favourable when pairs are building up body reserves before migrating to the breeding grounds as well as after breeding, ...
    • Behaviour and saltwater tolerance of European whitefish Coregonus lavaretus (L.) in an Arctic estuary 

      Fagard, Pierre (Master thesis; Mastergradsoppgave, 2015-05-27)
      Abstract European whitefish is well described and renowned for its polymorphism and faculty to occupy a wide range of freshwater habitats. This includes observations of individuals in some populations that utilize brackish estuarine habitats as feeding areas, although information on these populations is generally scarce. By use of acoustic tracking technology and physiological sampling, the ...
    • Betydning av raudåte under fôring av larver og yngel av torsk 

      Røkke, Magnus (Master thesis; Mastergradsoppgave, 2007-06)
      Riktig ernæring for anrikning av levendefôr til torsk er et problem. Ved å se om raudåteolje (calanus) kan konkurere med kommersiell olje, ble det utført 2 fôringsforsøk, der det ikke ble påvist signifikante forskjeller, men en antydning til at raudåteolje er like god om ikke bedre enn kommersiell olje.
    • 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 ...
    • Breeding success in relation to telomere length in a long-lived seabird, the Antarctic Petrel (Thalassoica antarctica) 

      Lopez-Sarasa, Inigo (Master thesis; Mastergradsoppgave, 2015-05-15)
      Integrating information about the physiology of individuals and their reproductive performance can be a key aspect in determining the relationships between environmental conditions and demographic parameters, and of the individual variability in these relationships. Telomeres are the protective caps of chromosomes found in eukaryotic cells. They generally shorten in relation to the stressors an ...
    • 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 ...
    • "Can energy expenditure of free-ranging kittiwakes be estimated by body acceleration?" 

      Kristiansen, Martin (Master thesis; Mastergradsoppgave, 2014-08-15)
      Abstract The way energy is used and acquired are fundamental questions in animal biology and figure greatly into conservation of a species. Accurate estimates of energy expenditure are critical in understanding how successful animals are throughout their lifespan and in quantifying population energy budgets and their role and impact on an ecosystem. Two methods have been commonly used to estimate ...
    • Can ground nesting birds escape predation by breeding in less productive habitats? A large-scale artificial nest study from Finnmark, Northern Norway 

      Jacobsen, Mari (Master thesis; Mastergradsoppgave, 2014-05)
      Predation is known to be one of the most important causes of nest failure in ground nesting birds, and many populations are experiencing a decline in breeding success worldwide. Predator abundance are expected to be highest closer to productive areas (i.e. Ecosystem exploitation hypothesis), and vary according to the availability of other prey (i.e. Alternative prey hypothesis). I hypothesized that ...