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norskInstitutt for arktisk og marin biologi: Recent submissions
Now showing items 1741-1760 of 2049
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The Arctic Sunrise Incident: A Multi-faceted Law of the Sea Case with a Human Rights Dimension
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014) -
Sources of variation in small rodent trophic niche: New insights from DNA metabarcoding and stable isotope analysis
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-05-15) -
Lipid content, composition and dynamics in northern marine diatoms. An experimental study using different analytical methods
(Master thesis; Mastergradsoppgave, 2014-11-20)In this study, the fluorophore Nile Red was used as a probe for lipid accumulation during nutrient stress in the diatom Coscinodiscus concinnus, and to quantify lipid concentration fluorometrically in 5 monocultures of northern diatoms. The results from the fluorometrical quantification were validated by solvent extraction and HPLC-MS analysis in Bergen. In addition, 17 monocultures of 7 species of ... -
Annual population dynamics of the small harpacticoid copepod Microsetella norvegica in a high latitude fjord (Balsfjord, Northern Norway)
(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. ... -
Space use by South Polar Skua during the breeding season at Svarthammaren, Antarctica
(Master thesis; Mastergradsoppgave, 2014-11-17)South Polar Skua is a seabird feeding on both marine resources and on other seabirds’ egg and chicks. There are few studies investigating South Polar Skua space use during breeding season and how it is affected by sex or phenology. This study was carried out during the breeding season 2012-2013 at Svarthammaren in Dronning Maud Land (71° 53′ S, 05° 10′ E). 56 GPS loggers were used to track 48 ... -
Tilleggsfôring av rein i Norge og konsekvensene dette har for naturmiljøet
(Master thesis; Mastergradsoppgave, 2014-11-18)Reindriften i Norge praktiserer tilleggsfôring av rein på utmarksbeite i stadig større grad. Fôringen skjer i all hovedsak på vinterbeite, under flytting og i kalvingsperioden. Praksisen med å tilleggsfôre rein på utmarksbeite kan potensielt introdusere nye svartelistede plantearter i beiteområdene. I Norge brukes det mest fôr i form av surfôr pakket i rundballer, men også tørrhøy og pellets ... -
The role of predation and food limitation on claims for compensation, reindeer demography and population dynamics
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-10)1.A major challenge in biodiversity conservation is to facilitate viable populations of large apex predators in ecosystems where they were recently driven to ecological extinction due to resource conflict with humans. 2. Monetary compensation for losses of livestock due to predation is currently a key instrument to encourage human–carnivore coexistence. However, a lack of quantitative estimates ... -
An assessment of MOSJ - The state of the marine environment around Svalbard and Jan Mayen
(Research report; Forskningsrapport, 2014-05) -
The PREDICTS database: a global database of how local terrestrial biodiversity responds to human impacts
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-12)Biodiversity continues to decline in the face of increasing anthropogenic pressures such as habitat destruction, exploitation, pollution and introduction of alien species. Existing global databases of species’ threat status or population time series are dominated by charismatic species. The collation of datasets with broad taxonomic and biogeographic extents, and that support computation of a ... -
Effect of alternating day and night temperature on short day-induced bud set and subsequent bud burst in long days in Norway spruce
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-12-09) -
Demographic effects of extreme weather events: snow storms, breeding success, and population growth rate in a long-lived Antarctic seabird
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-12-23)Weather extremes are one important element of ongoing climate change, but their impacts are poorly understood because they are, by definition, rare events. If the frequency and severity of extreme weather events increase, there is an urgent need to understand and predict the ecological consequences of such events. In this study, we aimed to quantify the effects of snow storms on nest survival ... -
Evaluation of etorphine reversed by diprenorphine for the immobilisation of free-ranging Atlantic walrus (Odobenus rosmarus rosmarus L.)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014) -
Atferd og spredning av rømt oppdrettslaks og villaks i Namsen og andre elver. Resultater fra merking av laks i Namsfjorden og Vikna
(Research report; Forskningsrapport, 2013-04)Vi undersøkte atferd og spredning av rømt oppdrettslaks og villaks i Namsen og andre elver i Midt-Norge i 2012. Hovedmålsettingen var å skaffe kunnskap slik at man kan gjøre sikrere beregninger av den reelle andelen rømt oppdrettslaks i lakseelver. De ulike delmålene var å: Vurdere sikkerheten i dagens metoder for beregning av andel oppdrettslaks i gytebe-stander av villaks. Sammenligne ... -
Mapping ecosystem services in the Arctic by cross-cultural PPGIS
(Conference object; Konferansebidrag, 2014) -
Variability in Calanus spp. abundance on fine- to mesoscales in an Arctic fjord: implications for little auk feeding
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014) -
The Effect of Freeze/Thaw Cycles on Reproducibility of Metabolic Profiling of Marine Microalgal Extracts Using Direct Infusion High-Resolution Mass Spectrometry (HR-MS)
(Journal article; Tidsskriftartikkel; Peer reviewed, 2014-10-13)During normal sample preparation, storage in freezers and subsequent freeze/thaw cycles are commonly introduced. The effect of freeze/thaw cycles on the metabolic profiling of microalgal extracts using HR-MS was investigated. Methanolic extracts of monocultures of Arctic marine diatoms were analyzed immediately after extraction, after seven days of storage at −78 °C (one freeze/thaw cycle), and after ... -
The summer diet of hooded (Cystophora cristata) and harp (Pagophilus groenlandicus) seals in the West Ice
(Master thesis; Mastergradsoppgave, 2014-08-15)The harp (Pagophilus groenlandicus) and hooded (Cystophora cristata) seals both inhabit the drift ice areas in the West Ice during certain times of the year, and the present study is part of the Institute of Marine Research’s management studies of these seals. Contents of gastrointestinal tracts from hooded and harp seals from June-July 2008 and 2010 and harp seal faeces samples were identified ... -
"Can energy expenditure of free-ranging kittiwakes be estimated by body acceleration?"
(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 ... -
Efflux of neurotransmitter from brain slices during O2 deprivation – comparing diving and non-diving species
(Master thesis; Mastergradsoppgave, 2014-08-15)During hypoxic insult, neuronal tissue undergoes an excitotoxic cascade of events leading to cell death. This response involves loss of membrane potential and uncontrolled release of primarily excitatory neurotransmitters. I propose that this fatal cascade is significantly delayed or attenuated in diving species, which are adapted to repeated exposures to hypoxic conditions as a consequence of ... -
Organohalogenated contaminants in nestlings of white-tailed eagles (Haliaeetus albicilla): Plasma concentrations and possible influences on biomarkers of health
(Master thesis; Mastergradsoppgave, 2014-09-15)Biomagnifying organohalogenated contaminants (OCHs) may have adverse effects on the health of birds, especially in marine avian top predators that accumulates high loads of such contaminants. Contaminants may impact the immune system by impairment of the humoral immunity and also influence the antioxidant enzyme activity. Moreover, developmental conditions may affect the shortening of telomeres, one ...
