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Now showing items 1-100 of 406
(Master thesis / Masteroppgave, 2007)
Polar cod (Boreogadus saida) were collected in two different fjords around Svalbard in 2006 to address their feeding ecology and growth. Kongsfjorden was sampled in spring and in autumn to investigate seasonal patterns. ...
(Master thesis / Hovedoppgave, 2007)
Abstract
In order to investigate the effect of different polluting agents to fungi, there is an obvious need for methods for estimating fungal growth. Given that the traditional methods are not accurate and efficient enough, ...
(Master thesis / Masteroppgave, 2007)
ABSTRACT
Vertical distribution and trophic interactions of zooplankton and fish were studied
at a 150 m deep station in Bunnefjorden – the innermost part of the Oslofjord -
during winter 2005/2006. Focus was on the krill ...
(Master thesis / Masteroppgave, 2009)
This thesis concerns the effect of marine pollutants on marine mammals, whit special focus given Bergmans studies on the Baltic grey seal. Environmental pollutions have gained increasing attention the last few decades, and ...
(Master thesis / Masteroppgave, 2006)
1. Det er foretatt en undersøkelse av den bentiske algevegetasjonen i Drangsvann, en brakkvannspoll øst for Kristiansand, Vest Agder. Det foreligger få grundige undersøkelser av algevegetasjonen i brakkvannspoller i Norge. ...
(Master thesis / Masteroppgave, 2006)
Invertebrate community responses to grazing were studied within a fully replicated,landscape scale experiment where densities of domestic sheep were manipulated in alpine ecosystems in Hol, Norway. I determined species ...
(Master thesis / Hovedoppgave, 2007)
There is an increasing demand for knowledge of habitats, communities and distribution patterns of the seafloor for impact assessment, conservation and ecological studies. The European Union Water Framework directive will ...
(Master thesis / Masteroppgave, 2009)
(Master thesis / Masteroppgave, 2008)
Denne studien tok for seg den mesopelagiske maneten Periphylla periphylla, med hovedfokus på vertikalfordeling og døgnvandringsatferd, sett i forhold til fysiske faktorer, fordeling av potensielle fødeorganismer og ...
(Master thesis / Masteroppgave, 2008)
(Master thesis / Hovedoppgave, 2004)
The delimitation of taxa in the Saxifraga rivularis complex is controversial. In the checklist for the Pan-Arctic Flora, the complex was tentatively divided into five species: the circumpolar S. hyperborea, the amphi-Atlantic ...
(Master thesis / Hovedoppgave, 2007)
ABSTRACT
This study focuses on the mycogeography of 83 selected macrofungi in Norway. The fungi’s distribution patterns were related to a dataset of 81 environmental variables through GLM in order to reveal which factors ...
(Master thesis / Hovedoppgave, 2007)
I dette studiet har jeg undersøkt i hvilken grad lengdefordelingen for 0+ ørret Salmo trutta ved vekstsesongens slutt kan forklares med variasjon i tetthet ( 0+, eller eldre ørret) og ulike miljøvariabler som varierer ...
(Master thesis / Masteroppgave, 2005)
It is stated that the feral American mink (Mustela vison), an introduced predator to Europe, have seriously affected local densities of birds breeding in coastal areas. I studied the effect of mink removal on breeding ...
(Master thesis / Masteroppgave, 2007)
Breeding habitat-choice in two closely related species of passerines, Great Tit (Parus major) and Blue Tit (Cyanistes caereleus) was studied to reveal if their habitat preferences primarily is a hereditary trait, or if ...
(Master thesis / Masteroppgave, 2010)
Although the production and use of the insecticide DDT have been restricted or banned since the 1970s, DDT and its metabolites are persistent in the environment and may still pose a hazard of toxic effects in wildlife and ...
(Master thesis / Masteroppgave, 2011)
Abstract
Mytilus edulis is one of the most abundant and widely distributed benthic invertebrate species found in the North Atlantic. The aim of this study was to test the applicability of hemocytes from Mytilus edulis for ...
(Master thesis / Masteroppgave, 2011)
Abstract
The sea-surface microlayer is the boundary layer between the water of the oceans and the atmosphere occupying approximately “1000 micrometer” uppermost part of the sea-surface microlayer (SML) (Liss and Duce, ...
(Master thesis / Masteroppgave, 2008)
Photosystem II (PSII) inhibitors are ubiquitous in costal areas around the world. Changes in chlorophyll fluorescence have been seen in plants exposed to low concentrations of PSII inhibitors in laboratory experiments. Saw ...
(Master thesis / Masteroppgave, 2007)
The release of persistent organic pollutants (POPs) into the environment for many decades has led to a worldwide contamination. The impact of pollutants on ecosystem and human health is an urgent and international issue ...
(Master thesis / Masteroppgave, 2007)
Numerous scientific investigations have been undertaken to answer the question of Polynesian origins. Most archaeological and linguistic evidence and previous studies in population genetics suggested that Remote Oceania ...
(Conference object / Konferansebidrag, 2010)
(Master thesis / Masteroppgave, 2012)
This study consists of two parts. In the first part, a method of measuring cranium size of great tits was developed, and in the second part cranium size was compared with measures of fitness, namely winter survival and ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2010)
Delayed density-dependent demographic processes are thought to be the basis for multi-annual cyclic fluctuations in small rodent populations, but evidence for delayed density dependence of a particular demographic trait ...
(Master thesis / Masteroppgave, 2008)
Alzheimers sykdom, Parkinsons sykdom og hjerneslag er assosiert med nevrodegenerering i visse deler av hjernen. Overstimulering av glutamatreseptorer med medfølgende produksjon av frie radikaler har blitt foreslått å være ...
(Master thesis / Hovedoppgave, 2006)
The Red Queen hypothesis states that biological entities rather than abiotic factors constitute the larger part of the selective environment experienced by individual organisms, and that species as a consequence undergo ...
(Master thesis / Masteroppgave, 2009)
I denne studien har jeg analysert forhold og faktorer som påvirker artsrikhet av flercellet zooplankton i innsjøer i Norge. Oppgaven består av to deler: den ene delen tar for seg mitt eget arbeid, som er prøvetaking for ...
(Master thesis / Masteroppgave, 2011)
The independent evolution of different quantitative traits is often thought to require a modular structure of the genotype-phenotype map (GP map). In that context, pleiotropy is considered a constraint on adaptive evolution. ...
(Master thesis / Masteroppgave, 2010)
I denne oppgaven studeres døgnvandringsmønstre og fødebiologi hos nordlig lysprikkfisk (Benthosema glaciale) i Masfjorden (ca. 60052’N, 5024’E), vest i Norge. Hovedmålet var å dokumentere og analysere bakgrunnen for invers ...
(Master thesis / Masteroppgave, 2008)
Sammendrag
Denne studien undersøker atferdsmønstre til Periphylla periphylla i Lurefjorden med fokus på maneter i nedre del av vannsøylen. Plassering av ekkolodd på fjordbunnen gjorde det mulig å studere svømmemønster, ...
(Master thesis / Masteroppgave, 2012)
Arctic ecosystems are strongly seasonal by nature, and photosynthetic organisms in particular so. In this study, the seasonality of one of the most commonly found marine photosynthetic picoeukaryotes, Micromonas pusilla, ...
(Master thesis / Masteroppgave, 2008)
Denne undersøkelsen ble utført som en del av et større tareskogsprosjekt hvis mål var å opparbeide kunnskap om biodiversitet og produksjon i tareskogsområder. Langs norskekysten domineres tareskogen av stortare Laminaria ...
(Master thesis / Masteroppgave, 2011)
Svepe agellater (Haptophyta) er en utbredt planteplanktongruppe som nnes i alle verdens
hav. De este representantene for denne algegruppen er små (vanligvis 2 20 m), encellede,
fotosyntetiserende agellater. Det har ...
(Master thesis / Masteroppgave, 2007)
Iodinated x-ray contrast media (ICM) are used to improve the visibility of internal structures of the body in an x-ray image due to their ability to attenuate x-rays, providing enhanced contrast between regions of interest ...
A phylogeographic survey of a circumboreal polypore indicates introgression among ecologically differentiated lineages Restricted Access
(Master thesis / Masteroppgave, 2009)
Gloeoporus taxicola is a widespread saprotrophic polypore that occurs on a variety of coniferous substrates in the Northern Hemisphere. In this master thesis a multi-locus sequencing approach was used, on an extensive ...
(Master thesis / Masteroppgave, 2009)
(Master thesis / Masteroppgave, 2011)
Over the past decades the population of red deer, Cervus elaphus, along the south-west coast of Norway have increased 10 fold in density as evidenced from the harvest statistics. At the same time the abundance of Ixodes ...
(Master thesis / Masteroppgave, 2012)
The use of species habitat suitability (HS) modelling is increasing as an approach in detecting important areas in integrated coastal zone management. European lobster (Homarus gammarus) is currently listed as near threatened ...
(Master thesis / Masteroppgave, 2011)
A population of pied flycatchers was studied to examine learning of song syllables within a single breeding season. Males were separated into neighbor groups based on geographical location and access to experienced, potential ...
Effects of mother condition on pregnancy and early losses of calves in semi-domesticated reindeer Restricted Access
(Master thesis / Masteroppgave, 2011)
A central issue in life history theory is the trade-off between current reproduction and future survival. As mammalian herbivores with long life prioritize survival above reproduction, especially under harsh conditions, ...
(Master thesis / Masteroppgave, 2012)
Interactions between closely related species, including resource competition and hybridization, might influence phenotypic evolution and play a significant role in evolutionary diversification. There may be different ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2009)
Background: Large multigene sequence alignments have over recent years been increasingly employed for phylogenomic reconstruction of the eukaryote tree of life. Such supermatrices of sequence data are preferred over single ...
(Doctoral thesis / Doktoravhandling, 2009)
Denne avhandlingen viser at fisk utsatt for lave nivåer av produsertvann over lang tid kan utvikle skader på arvematerialet, modnes senere og få redusert vekst. Produsertvann er et biprodukt fra utvinningen av olje og ...
(Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2011)
Atlantic cod (Gadus morhua) is a large, cold-adapted teleost that sustains long-standing commercial fisheries and incipient aquaculture. Here we present the genome sequence of Atlantic cod, showing evidence for complex ...
(Master thesis / Masteroppgave, 2011)
Homoploid hybrid speciation in animals is poorly understood compared to the classic bifurcating mode of species diversification, mainly because of the scarcity of well-documented cases. Here, I presents the results of a ...
(Master thesis / Masteroppgave, 2012)
Organochlorines can possibly cause toxic effects in birds. In this thesis, levels and relationships between health parameters, organochlorine contaminants (OCs) and body condition index (BCI) in black-legged kittiwakes and ...
(Master thesis / Masteroppgave, 2008)
Flakavatn is probably Norway s largest high-alpine lake, situated in the remote Finse region, south central Norway. The unique character of the lake is a result of the long lasting annual freezing period, which affects ...
(Master thesis / Masteroppgave, 2010)
Dette studiet er en del av et større forskningsprosjekt, Parameterisation of the Environmental Impacts on Bottom Fauna of Water-based Drilling Fluids and Cuttings - Field and Mesocosm Experiments (PEIOFF-FAME). Målet med ...
Habitat Classification Based on Bottom Topography and its Predictability for Describing Polychaeta and Trait Distribution Restricted Access
(Master thesis / Masteroppgave, 2011)
There is an increasing demand for simple and cost-efficient methods for describing habitats, communities and distribution of organisms on the seabed for management, conservation and prediction of ecological patterns. To ...
(Master thesis / Masteroppgave, 2009)
Lesjoner på lever ble undersøkt i åtte sel innsamlet mellom april 2008 og september 2009 i Hvaler og Sandøy kommune.
Det var ikke noe spesielt med kondisjonen til selene som tilsa at dyrene hadde dårlig helse. ...
(Master thesis / Masteroppgave, 2012)
Eelgrass (Zostera marina) meadows are a common feature in shallow waters along the Norwegian coast, where they provide a habitat for an infaunal community with a high biodiversity. A field experiment, comprised of two ...
(Master thesis / Hovedoppgave, 2007)
(Master thesis / Hovedoppgave, 2004)
Denne undersøkelsen har fokusert på overvintrende brisling (Sprattus sprattus) i Bunnefjorden i indre Oslofjord. Studiet ble gjennomført vinteren og våren 2002. Ekkolodd og tråling med påfølgende laboratorieanalyser, ble ...
(Master thesis / Masteroppgave, 2006)
Post settlement cod (3-11cm total body length) juvenile s diet, condition, body length and macro parasites were investigated in coastal Skagerrak, June 2005. They were collected by beach seining in eelgrass habitats. Three ...
(Master thesis / Masteroppgave, 2007)
This study was conducted as part of a kelp forest project which aim is to acquire knowledge about biodiversity and productivity in kelp forest areas. The epiphytic algae associated with the stipe of Laminaria hyperborea ...
(Master thesis / Masteroppgave, 2007)
Klaretjern er en dimiktisk innsjø som ligger i Aremark kommune i Østfold fylke (59 8' 18'' N og 11 38' 54'' Ø). Innsjøen har ingen innløp, kun tilsig fra nedbørfeltet. Utløpet består av en sildrebekk i nordenden av vannet. ...
(Master thesis / Masteroppgave, 2006)
Lake Finsevatnet is a regulated monomictic alpine lake situated a little north of the Hardangerjøkulen glacier in Ulvik, Hordaland county. The lake is regulated 3,3 meters at most. Lake Flakavatnet is also a monomictic ...
(Master thesis / Masteroppgave, 2008)
Denne studien har fokusert på overvintring av brisling (Sprattus sprattus) i fire
forskjellige fjordarmer i indre Oslofjord under vinteren 2006/2007. Pelagisk tråling og
bunntråling samt ekkolodd ble brukt for å bestemme ...
(Master thesis / Masteroppgave, 2011)
Sealworms, Pseudoterranova decipiens, are found in several fish species, and generally have a high prevalence in cod (Gadus morhua) and sculpins (Myoxocephalus scorpius). In the outer Oslofjord the final host is common ...
(Master thesis / Masteroppgave, 2005)
The present thesis seeks to document the diversity of the flagellates in some sediments of the Oslofjord. The analysis of these sediments lasted from January 2005 until June of the same year. The sand samples were collected ...
(Master thesis / Hovedoppgave, 2007)
Størrelsesendringen til Ceratium hirundinella i Kolbotnvann ble registrert og målt med en bildeanalyse gjennom vekstsesongen på to ulike dyp. Det ene dypet var i overflaten (1m) og det andre var i nærheten av termoklinen ...
(Master thesis / Masteroppgave, 2009)
Sammendrag
Denne oppgaven er basert på data samlet inn under AKES 1 toktet (Antarctic Krill and Ecosystem Studies), utført i regi av Havforskningsinstituttet (IMR: Institute for Marine Research, Norway) med forskningsfartøyet ...
(Master thesis / Masteroppgave, 2010)
De pennate kiselalgeslektene Pseudo-nitzschia og Fragilariopsis er viktige komponenter av planteplanktonsamfunnene i Antarktis og Arktis. Kryptiske og pseudokryptiske arter forekommer, og det er nødvendig med elektronmikroskopi ...
(Master thesis / Masteroppgave, 2012)
The aim of this study was to investigate the effects from marinas on infaunal communities in Zostera marina meadows and in adjacent unvegetated sediments. The results from the study showed that Z. marina meadows supported ...
(Master thesis / Masteroppgave, 2009)
During the last 50 years several changes has occurred in the flora of Oslofjord region. The Crambe maritima populations in the Oslofjord region have increased in size and number, the Eryngium maritimum populations seem ...
(Master thesis / Masteroppgave, 2007)
The red deer (Cervus elaphus) are among the most important game species in Norway, with a tenfold increase in harvest over the last few decades. Despite its importance, information regarding red deer habitat selection is ...
(Master thesis / Masteroppgave, 2008)
I dette studiet undersøkte jeg overlevelsestrender hos elgkalver og voksne elgkuer på Koppang i Hedmark fylke, sør-øst i Norge. Ulv var tilstede i området det meste av studieperioden, men antall ulveflokker endret seg noe ...
(Master thesis / Masteroppgave, 2006)
Snow leopards (Uncia uncia) inhabit the remote mountain ranges of the Himalayas, and are
currently listed as Endangered. Due to their inaccessible habitat and sparse distribution it is
difficult to compile exact estimates ...
(Master thesis / Masteroppgave, 2011)
Phleum pratense (timotei) dyrkes kommersielt som fôr til husdyr. Soppendofytter er vanlig i
alle planter, der de har ulike egenskaper som kan påvirke verten samt herbivorer, for
eksempel med toksiner. Kunnskapshull i forhold ...
(Master thesis / Masteroppgave, 2008)
Many fish stocks today are declining due to the heavy harvesting and the increasingly demand for more food caused by the growing human population. Life-history trait as age and size at maturity are affected, the fish are ...
(Master thesis / Masteroppgave, 2008)
Summary
The anti-predatory behaviour displayed by female Great Tit (Parus major) and Blue Tit (Cyanistes caereleus) in the nestbox was studied to observe possible differences in response between the species, and also ...
(Master thesis / Hovedoppgave, 2006)
During three subsequent reproductive seasons with contrasting food availability, the King Penguin Aptenodytes patagonicus responses were monitored in a small colony at Husvik, South Georgia. Observations of metal flipper ...
(Master thesis / Masteroppgave, 2009)
The northern blue whiting is a small mesopelagic gadoid, widely distributed in the north‐east Atlantic. The fishery on this species is extensive and is of commercial importance for several states, also Norway. There have ...
(Master thesis / Masteroppgave, 2007)
Over the past 2 decades major advancements in phylogenetics have been made and this in turn
has influenced our understanding of eukaryotic evolution. The use of morphological data
combined with sequence data has been the ...
(Master thesis / Masteroppgave, 2007)
Climatic fluctuations characterized the climate in East Africa during the Plio-Pleistocene. These variable conditions established opportunities for ecological fragmentation with subsequent genetic isolation of species ...
Evolutionary studies of uncultivated Radiolaria and their symbionts using Single Cell Whole Genome Amplification Restricted Access
(Master thesis / Masteroppgave, 2010)
Understanding the evolution of eukaryotes and resolving the Tree of Life is one of the major goals of biology. Protists (unicellular eukaryotes) play a crucial role in this quest being the earliest diverging eukaryotes and ...
(Master thesis / Masteroppgave, 2009)
Singing in the pied flycatcher, Ficedula hypoleuca, was examined in both intra- and intersexual contexts. Song responses to male intruders and prospecting females were investigated by introducing caged conspecific birds ...
(Master thesis / Masteroppgave, 2008)
The Semi-collared flycatcher (Ficedula semitorquata) is a member of the black-and-white flycatcher species complex. It is poorly studied, rare, and is currently classified as “near threatened”, in the IUCN red lists of ...
(Master thesis / Masteroppgave, 2009)
Abstract
Previous studies have revealed increased levels of germline mutations in minisatellite DNA in populations of herring gulls and mice sampled in Hamilton Harbour, Ontario Canada, an industrial area with high emissions ...
Studies of generic and specific delimitation of the genera Drimiopsis and Ledebouria (Hyacinthaceae)
(Master thesis / Masteroppgave, 2007)
The monocot genera Ledebouria and Drimiopsis belong to the family Hyacinthaceae in the order Asparagales. The aim of this study was to investigate the generic delimitation between the two genera using DNA sequencing, and ...
(Master thesis / Masteroppgave, 2006)
Fluctuating asymmetry (FA) as a measure of environmental stress was studied in polar bear (Ursus maritimus) skulls from East Greenland (n = 300, collected during the period 1892-2004) and Svalbard (n = 391, collected during ...
(Master thesis / Masteroppgave, 2006)
Introduced plant species may lead to negative consequences for the local community by outcompeting other species, and in extreme situations decrease biodiversity. It is well known that once an invasive species becomes ...
(Master thesis / Masteroppgave, 2008)
Oviraptorids are one of several groups of dinosaurs which have evolved beaks. Of extant beaked animals, birds and turtles are the best known. In this study, an anatomical comparison between oviraptorids, extant birds and ...
(Master thesis / Masteroppgave, 2005)
In this study I examined intra-specific variation in primary sex traits in male bluethroats (Luscinia svecica svecica), a passerine species with a high intensity of sperm competition, The single most important predictor ...
(Master thesis / Masteroppgave, 2007)
Ornithomimosaurs are only one out of several dinosaurian groups that at some point evolved beaks. The morphology of this beak and its relation to dietary habits have long been debated.Birds and turtles are the primary ...
(Master thesis / Masteroppgave, 2010)
Trichaptum fuscoviolaceum is a saprotrophic basidiomycete morphospecies growing on conifers. In the present study, the genetic structure in a circumboreal sample of T. fuscoviolaceum was analyzed using a multilocus sequencing ...
(Master thesis / Masteroppgave, 2007)
Summary.
This work arose from a collaborative project between the University of Western Cape and the University of Oslo, funded by the Research Council of Norway. The original project was set up to identify informative ...
(Master thesis / Masteroppgave, 2008)
Adaptation to different foraging resources is believed to be an important driving force of divergence between populations. Following colonization of freshwater, threespined sticklebacks (Gasterosteus aculeatus) have occupied ...
A study of the hybrid zone between house sparrow (Passer domesticus) and Italian sparrow (Passer italiae) based on plumage characters and microsatellites Restricted Access
(Master thesis / Masteroppgave, 2009)
(Master thesis / Masteroppgave, 2011)
Polyploidi er en sentral drivkraft for evolusjon hos dekkfrøede planter, og polyploide linjer er spesielt tallrike i arktiske strøk. I denne studien undersøkte jeg di- og tetraploide populasjoner av arten Jåblom, Parnassia ...
The fungal community associated with roots of alpine and arctic Dryas octopetala along a latitudinal gradient Restricted Access
(Master thesis / Masteroppgave, 2009)
The ectomycorrhizal (ECM) dwarf shrub Dryas octopetala is one of the hardiest and most abundant of all woody plant groups in alpine and arctic environments. The main aim of this study was to characterise the fungal communities ...
(Master thesis / Masteroppgave, 2007)
Four arctic, obligate parthenogenetic populations assumed to be polyploid and one temperate, cyclic parthenogenetic, diploid population were used to compare life history traits, growth rates and content of nucleic acids ...
(Master thesis / Masteroppgave, 2010)
Fungal endophytes have been shown to be extremely widespread and abundant in terrestrial plants. It is also known that fungal endophytes may affect the grazing intensity of the host plant. In this study the occurrence of ...
(Master thesis / Masteroppgave, 2012)
Nematodes from 361 fish from 15 species were collected between August 2010 and March 2012 at Langøya and at Torbjørnskjær in the outer Oslofjord. The study focused on the infection levels of the three most abundant nematode ...
(Master thesis / Masteroppgave, 2012)
The lack of empirical knowledge on how marine reserves should be effectively designed has impeded their extensive implementation as fisheries management tools. While current knowledge is largely based on computer models, ...
(Master thesis / Masteroppgave, 2012)
Large herbivores and their grazing impact is an important subject in ecology. It is well known that grazing shapes the structure, diversity and functioning of terrestrial ecosystems, but how the level of density dependence ...
(Master thesis / Masteroppgave, 2012)
Background: In the search for a renewable energy, micro algae have been proposed as a promising source of lipids that can be used to produce biodiesel. Method: Three species of marine microalgae, Isochrysis, Pavlova and ...
(Master thesis / Masteroppgave, 2012)
Levende organismer er kontinuerlig utsatt for påvirkninger som kan skade DNA. Dette inkluderer oksidative DNA-skader som oppstår via normal metabolisme i cellene og fra en rekke miljøkjemikalier. Reparasjon av oksidative ...
(Master thesis / Masteroppgave, 2012)
It is now commonly recognized that animals have different personalities and that these personalities are moderately heritable, repeatable, and may influence fitness components such as survival and reproduction. Much of ...