• Winter behaviour of riverine anadromous Arctic charr and sea trout in northern Norway 

      Jensen, Jenny Lovisa Alexandra (Master thesis; Mastergradsoppgave, 2008-05)
      Based on earlier migration studies of lake-dwelling anadromous Arctic charr Salvelinus alpinus (L.) and sea trout Salmo trutta L. in northern Norway, both species are believed to solely overwinter in fresh water and spend only one to three months in the sea during summer. This is an assumption upon which all current management of the species in the area is based, although no studies have focused on ...
    • Estimating survival rate in Brünnich's guillemot (Uria lomvia) chicks. A study of mark-recapture methods using photo series data 

      Lorentzen, Erlend (Master thesis; Mastergradsoppgave, 2008-05)
      Three different mark-recapture models were applied to resighting data for Brünnich's guillemot (Uria lomvia) chicks obtained from photo series. Performances of the various models as potential tools for estimating chick survival over the breeding season were assessed. Of particular interest was Pradel’s multievent model, estimating state transition probabilities while accounting for uncertainty of ...
    • The spatial relationship between pelagic fish species in the Barents Sea 

      Haukeland, Vegard Bjartveit (Master thesis; Mastergradsoppgave, 2008-05-15)
      Capelin (Mallotus villosus) is a pelagic fish species with large interannual stock variations in the Barents Sea ecosystem. Together with polar cod (Boreogadus saida) and juvenile herring (Clupea harengus), it functions as an intermediate link that transfers energy from zooplankton to higher trophic levels. Capelin is a key prey and important as a food resource both to sea birds, sea mammals and ...
    • Predation on artificial ground nests in a subarctic ecosystem 

      Klausen, Kristin Brekke (Master thesis; Mastergradsoppgave, 2008-05-15)
      Studies of gallinaceous bird species stress the importance of high nest losses as a factor influencing life histories and populations. Accordingly knowledge of the mechanisms affecting nest losses is essential for understanding the population dynamics. The aim of this one year study was to estimate predation rates on artificial ground nests in ptarmigan habitats, along a landscape gradient which ...
    • Norwegian hook designs improve catch efficiency in the Adriatic bottom longline fishery 

      Tatone, Ivan (Master thesis; Mastergradsoppgave, 2008-05-15)
      The present study reports the results of investigations conducted during 2006-2007 of the bottom longline fishery in the Southern Adriatic Sea. The study investigated the rigging of the line and the material used. These investigations specifically compared the catch efficiency of the traditionally used J-shaped hook to hooks with innovative design that are commonly used in the Norwegian costal ...
    • Habitat use and feeding behaviour of harbour seals (Phoca vitulina) in Vesterålen 

      Ramasco, Virginie (Master thesis; Mastergradsoppgave, 2008-05-28)
      A pilot project was carried out by the Institute of Marine Research (IMR) to test the functionality of GPS phone tags (by SMRU) on harbour seals (Phoca vitulina) in the Vesterålen archipelago, Norway. Acoustic surveys were performed to investigate the abundance of fish in these waters and scat sampling was used to assess the diet composition of the seal population inhabiting the area. Five juvenile ...
    • Nest site selection by northern goshawk Accipiter gentilis in northern coastal birch forests 

      Andersen, Ellen F. (Master thesis; Mastergradsoppgave, 2008-06-03)
      Most studies of nest site selection by northern goshawk, Accipiter gentilis, have been done in mixed – or coniferous forests, and emphasis has been put on the importance of large trees and relatively intact, old forest stands for nesting sites. However, goshawks in northern Norway are found in birch forests characterized by relatively small trees and a high natural level of fragmentation. In this ...
    • Makroalgesamfunn i littoralsonen på fem lokaliteter i Troms - endringer langs en enksponeringsgradient og endringer de siste 25 år 

      Nervold, Gunhild Garte (Master thesis; Mastergradsoppgave, 2008-06-05)
      Formålet med denne oppgaven var å se på kvantitative endringer av makroalge- og lavsamfunnet i littoralsonen på fem lokaliteter i Troms, langs en eksponeringsgradient fra fjord til kyst. Ofte finner man samfunnsendringer innover i fjordene som er nært korrelert med forandringer i substratets stabilitet, tekstur og lokaltopografiske forhold i fjæra (helning) (pers. med. Tor Eiliv Lein). Artsdiversiteten ...
    • Effects of crude oil contaminated sediment on the early life stages of lumpsucker (Cyclopterus lumpus L.). 

      Hustad, Anette (Master thesis; Mastergradsoppgave, 2008-08-15)
      Lumpsucker (Cyclopterus lumpus) is a demersal and shallow water spawning fish species with a relatively long egg incubation period. In case of acute oil pollution the embryos will be exposed to PAHs in the water for a relative long period. In this experiment we made a flow through rock column incubation system with oil contaminated gravel and exposed fertilized lumpsucker eggs to the water soluble ...
    • Pseudocalanus in Svalbard waters : identification and distribution patterns of two sibling copepod species 

      Gudmundsdottir, Ragnhildur (Master thesis; Mastergradsoppgave, 2008-11-05)
      Marine copepods of the genus Pseudocalanus (Calanoida) are common in Svalbard waters as well as throughout the northern hemisphere. They contribute considerably to plankton biomass in addition to Calanus spp. and play an important role in the marine food web as a link between planktivores, such as fish larvae, and microalgae. Pseudocalanus consists of several sibling species, and two of them, ...
    • Use of bubble flotation to improve copepod fisheries: laboratory studies on the physical and behavioural interactions of Calanus finmarchicus and air bubbles 

      Jeuthe, Henrik (Master thesis; Mastergradsoppgave, 2008-11-15)
      The current study presents a novel approach to zooplankton harvest in the ocean, where copepods are lifted through the water column and concentrate them at the ocean surface. There they are harvested with a surface skimmer or shallow trawl. The method can potentially reduce fuel costs and unwanted by-catch compared to a conventional plankton trawl. The optimal bubble size for attachment to Calanus ...
    • The role of white wing bands in parental care and mate choice in the female Common eider (Somateria mollissima) 

      Hoholm, Marte Sørbø (Master thesis; Mastergradsoppgave, 2008-11-15)
      The female Common eider (Somateria mollossima) is a drab, lightly coloured bird, easily distinguished from the brightly ornamented male. Unlike the male, the female has white bands on the tips of her wings, and these white wing bands have been shown to reflect individual quality in previous studies. In this study the potential role of the white wing bands in parental care and mate choice is studied, ...
    • "Parasitized by your own kind" : the life of the Svalbard Eider (Somateria mollissima) 

      Hagen, Jeanette Iren (Master thesis; Mastergradsoppgave, 2008-11-15)
      Conspecific brood parasitism is a subtle reproduction tactic often performed by many species. The parasitizing females lay eggs in the nest of another female of the same species, and the hosting female then incubates and raises both her own and the parasite’s offspring. Is it highly discussed why the hosting females allow this parasitism, whether she is able to detect it, or if she receives more ...
    • Potential effects of two stressors on morphological traits of Northern Goshawk (Accipiter gentilis) nestlings 

      Schnug, Lisbeth (Master thesis; Mastergradsoppgave, 2009-01)
      Anthropogenic and natural stressors can affect ecosystems negatively and it is therefore important to have a clear understanding of the responses of organisms to stressors. The Northern Goshawk (Accipiter gentilis) is a common raptor species of the boreal forest ecosystem and its location at the top of its food chain makes it a special target for two important stressors; endoparasitism and environmental ...
    • The effect of vegetation type and snow depth on annual CO2 efflux in a high arctic tundra region 

      Morgner, Elke (Master thesis; Mastergradsoppgave, 2009-02-15)
      This thesis evaluates the effect of vegetation type and increased snow depth on soil temperature and annual CO2 efflux in an arctic tundra region. Snow fences were set up to manipulate snow accumulation in heath and meadow vegetation on Spitsbergen. Field campaigns lasted from July 2007 - July 2008. CO2 efflux, measured by means of a dark and closed-dynamic soil flux chamber, showed seasonal variation ...
    • The substrate specificities and physiological function of the Toxoplasma gondii apicoplast phosphate translocator 

      Johnsen, Hanne Risan (Master thesis; Mastergradsoppgave, 2009-05-15)
      The apicomplexan parasites including the causative agents of malaria (Plasmodium spp.) and toxoplasmosis (Toxoplasma gondii) are running the risk of developing resistance to existing drugs. Members of the phylum Apicomplexa harbour a relict plastid, the apicoplast, which show homology to the chloroplasts of plants and algae. The apicoplast appears to be indispensable to the parasites, and due to its ...
    • TBT-induced imposex related to age and length in Buccinum undatum at two localities in Balsfjorden 

      Dahl-Hansen, Ida Elisabeth (Master thesis; Mastergradsoppgave, 2009-06-08)
      Background: The organotin compound tributyltin (TBT), used as an antifouling agent in ship hull paint, is known to cause imposex in several species of marine gastropods. Imposex is the imposition of male sexual characteristics on females, and can lead to female sterility. The common whelk, Buccinum undatum, is a common species in Norway and has received attention for its export potential. Because ...
    • Sources of variation in macrobenthic biodiversity and the implications for monitoring programmes in the Barents Sea 

      Bersås, Nina Marie (Master thesis; Mastergradsoppgave, 2009-07-01)
      In this thesis, several sources of variation which affect macrobenthic biodiversity was examined, in addition to addressing the resulting implications for monitoring programmes in the Barents Sea. Marine benthic biodiversity patterns at the time of sampling were examined across a range of scales, pre-defined by the study design. The benthic distribution was examined in relation to characteristics ...
    • Lik vinterbeite, ulik produksjon og vektutvikling: Et demografistudie på tamrein (Rangifer Tarandus) i Finnmark 

      Oskal, Ellen Margrethe (Mastergradsoppgave; Master thesis, 2009-08)
      Tetthetsavhengig næringsmangel som fører til lave vekter og påfølgende minket rekruttering er et velkjent fenomen i reindriften i Finnmark. Forskjeller i vekt og produksjon i reindriften i Norge har blitt forklart med ulikheter i høstingsstrategier og vinterforhold. Imidlertid har det blitt viet mindre oppmerksomhet til hvordan ulike sommerbeiteforhold påvirker reproduksjon og vektutvikling. I dette ...
    • The mating strategy of female Svalbard reindeer 

      Heatta, Maret Johansdatter (Mastergradsoppgave; Master thesis, 2009-08-15)
      The mating system of Svalbard reindeer was studied in detail on Nordenskiöld land, Svalbard during the mating season 2007. Little is known about the female mating systems of Svalbard reindeer. The aims of the study were to investigate the composition of harems in relation to male attractiveness, harem size and reproductive history and the associated behaviour of females. The movement patterns of ...