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Shape matters: Ecomorphology Informs on Functional Traits and Diversity of Barents Sea Fish
(Master thesis; Mastergradsoppgave, 2014)
The Barents Sea (BS) is an arcto-boreal sea and one of the most productive areas adjacent to the Arctic,
hosting many commercial fish stocks. As a result of climate change, temperature increases and a
northward movement of several fish species in the BS have been reported, which will likely change
community structures and ecosystem functioning. Hence, more information on ecosystem functioning
need ...
Do diet of long rough dab (Hippoglossoides platessoides) differ between fjords with and without red king crab (Paralithodes camtschaticus)? A study of summer diet
(Master thesis; Mastergradsoppgave, 2017-05-15)
The purpose of this study is to describe the diet of long rough dab in three different fjords
with and without red king crab. The hypothesis is that red king crab are influencing the diet
and possible also growth of long rough dab. By the applying objectives it is assumed to give
an answer to if red king crab is influencing different aspects of the diet and growth in long
rough dab.
By the ...
Chronobiology of voluntary food intake in reindeer (Rangifer tarandus tarandus)
(Master thesis; Mastergradsoppgave, 2018-11-15)
In all organisms, biological rhythms arise from the interaction between endogenous clocks and a rhythmic environment. The timing of sunrise and sunset synchronize internal timing processes and inform the organism not only of the time of day, but also of the time of year. For animals living in polar regions biological timekeeping represents a challenge, given that the sun does not rise during the ...
Epibenthic fauna in Balsfjord. Potential food for the invasive red king crab (Paralithodes camtschaticus) with special attention to the deposit-feeding sea star Ctenodiscus crispatus
(Master thesis; Mastergradsoppgave, 2017-05-12)
After its introduction to the Barents Sea in the 1960’s, the red king crab Paralithodes camtschaticus has become an invasive species in northern Norwegian fjords and it is continuing to spread southward along the coast. Due to its negative effects on native benthic fauna through predation, establishing baseline studies in undisturbed fjords is important. In this study, the soft-bottom epibenthic ...
Haul-out behaviour of walruses (Odobenus rosmarus) monitored by camera stations - potential impacts of tourist visitations
(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 ...
Body composition changes of hooded seal (Cystophora cristata) pups during extreme lactation
(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 ...
Arctic marine microbial ecology during the Svalbard Polar Night
(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 ...
Gjenfangst av laks (Salmo salar L.) etter fang og slipp-praksis i norske elver
(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 ...
Sesongmessig vandringsmønster til sjørøye og sjøørret i to nordnorske elver - en sammenligning mellom to arter i to elver
(Master thesis; Mastergradsoppgave, 2014-11-20)
Sjørøye og sjøørret er anadrome fisker som vandrer mellom ferskvann og sjøvann. Det meste av kunnskapen om vandringsadferden på disse fiskene er gjort på bestander som har tilgang til innsjøer i ferskvannssystemet, i tillegg til at studiene ofte er relativt kortvarige undersøkelser som ikke strekker seg over et helt år. Kunnskapen om anadrome elvelevende bestander er til forskjell mangelfull, spesielt ...
Studie av bunnforhold og forekomst og tetthet av utvalgte fisk og pigghuder - Evaluering av undervannsfilming som metode
(Master thesis; Mastergradsoppgave, 2015-02-15)
Undervannsvideo er en metode for beregning av forekomst av marine dyr og kartlegging av bunnsubstrat og algedekke. Metoden har vært sammenlignet med andre metoder som dykking og bunntrål (Spencer et al. 2005). I dette studiet ble det gjort en evaluering av undervannsfilm som metode for undersøkelse av forekomst og tetthet av utvalgte fisk og pigghuder, og kartlegging av bunnforhold på grunt vann. ...