Browsing Økologi by Title
Now showing items 15-34 of 40
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(Master thesis / Masteroppgave, 2008)Separate gytedemer av harr har etablert seg over 20-25 generasjoner i Lesjaskogsvatn, Oppland fylke. Gytebekkene har konsistent ulike temperaturregimer. Nylige undersøkelser indikerer motgradient veksttilpasning i tidlige ...
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(Master thesis / Masteroppgave, 2008)An upper Ordovician (upper Sandbian) benthic Paleozoic fauna at Langesund in the Oslo graben area has been reviewed. The study area consisted of the uppermost 13 meters of sediments in the Fossum Formation. A species/plot ...
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(Master thesis / Masteroppgave, 2010)Aposematism is a defence system used by toxic animals where the animals use warning colouration, often combined with warning gestures, to fend off predators. The most probable scenario is that the toxicity was developed ...
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(Master thesis / Masteroppgave, 2006)Abstract The heterospecific attraction hypothesis suggests that migrants cue on residents with similar ecological needs to find suitable breeding sites, and that they have reproductive fitness benefits from doing so. In ...
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(Master thesis / Masteroppgave, 2007)Great tit nestlings won’t thrive in nests of the pied flycatcher, even though the opposite has been proven successful. In order to explore some of the reasons why, we performed cross fostering experiments where great tit ...
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(Master thesis / Masteroppgave, 2008)Many freshwater fishes are fragmented into local populations. Brown trout (Salmo trutta) is a fish that express high genetic heterogeneity and are known to be structured into genetically differentiated subpopulations ...
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(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 ...
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(Master thesis / Masteroppgave, 2006)The aim of this study was to investigate to what extent population density and small scale habitat variability affect somatic growth of resident, stream-living brown trout Salmo trutta. There is an ongoing debate whether ...
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(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 ...
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(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 ...
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(Master thesis / Masteroppgave, 2005)To test if dispersers use odour to discriminate between familiar and unfamiliar individuals male and female root voles (Microtus oeconomus) were given the opportunity to choose between one familiar and one unfamiliar test ...
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(Master thesis / Masteroppgave, 2009)
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(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 ...
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Microsatellite variation in two small and isolated populations of the endangered Ethiopian wolf (Canis simensis)Restricted Access (Master thesis / Masteroppgave, 2008)Summary The genetic concerns in conservation biology arise from the deleterious effects of small population size, which is a consequence of loss of genetic diversity through genetic drift and inbreeding. The endangered ...
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(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 ...
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(Master thesis / Masteroppgave, 2008)Divergent selection pressures, induced by variations in environmental conditions, can be expected to favour different phenotypic expressions. Different populations show thus often local adaptations that could be attributed ...
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(Master thesis / Masteroppgave, 2009)Variation in behavioral traits may be genetically or environmentally determined, or both. Previous studies on nest building behaviour in captive birds have proposed that nest building is mainly genetically determined. ...
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(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 ...
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(Master thesis / Masteroppgave, 2008)A challenge in ecotoxicology is the translation of individual-level effects of exposure, as measured in for instance laboratory tests, into population-level effects that have more ecological relevance. It is not necessarily ...
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Reproductive success in the pied flycatcher Ficedula hypoleuca in relation to nest site altitudeRestricted Access (Master thesis / Masteroppgave, 2011)Abstract In temperate areas, we tend to see an advancement of spring as the global climate is changing at a rate that may be hard for long distance migrant birds to track. Caterpillars are the most common prey type for ...