Blar i Fakultet for naturvitenskap (NV) på emneord "Økologi"
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Breeding success in Arctic snow buntings (Plectrophenax nivalis) in relation to climatic variations
(Master thesis, 2012)The ongoing global warming is especially pronounced in the arctic, and it is therefore important to investigate the effect of these changes on arctic ecosystems. In this study the Snow bunting (Plectrophenax nivalis) ... -
Breeding success of the Gyrfalcon (Falco rusticolus) in northern Norway in relation to food supply and weather
(Master thesis, 2012)Food supply and weather are among the main factors limiting bird numbers. In raptors prey availability may be closely linked to the reproduction output while weather conditions most often act indirectly by modifying food ... -
Cost of migration in moose (Alces alces) with regard to mortality risk and locomotion
(Master thesis, 2011)Summary1. Migration is present in all animal taxa and is defined as a periodic movement pattern between given ranges. Migratory individuals generally move more directional and with higher speed than stationary individuals ... -
Ernæring og habitatbruk hos sik (Coregonus lavaretus) og røye (Salvelinus alpinus) i Aursunden
(Master thesis, 2012)Sik (Coregonus lavaretus) dominerte i littorale- og littorale habitater. Røyr hadde størst utbredelse i profundale habitater. Artene viste betydelig næringsoverlapp. -
Factors Affecting Juvenile Movement in a House Sparrow Metapopulation
(Master thesis, 2012)Dispersal propensity can vary considerably between individuals in a population. Understanding which individuals disperse- and under what circumstances these individuals disperse is valuable for conservation. Factors ... -
Fitness Consequences of Intra-Island dispersal in a House Sparrow (Passer domesticus) Population
(Master thesis, 2012)Dispersing individuals have the ability to link fragmented populations to each other, and influence a wide range of ecological and evolutionary processes. Understanding the fitness differences between resident and dispersing ... -
Growth and Movement in Brown Trout (Salmo trutta) in two Norwegian Rivers
(Master thesis, 2012)In the present study, using stream-dwelling brown trout (Salmo trutta) as a model species, movement through the summer and autumn in two large Norwegian rivers, River Glomma and River Gudbrandsdalslågen, was observed. ... -
Long-term Effects of Seeding in an Alpine Environment: and a comparison of the effect of native Festuca ovina and non-native Festuca rubra on the establishment of native Betula nana
(Master thesis, 2011)As human induced disturbance in alpine ecosystems have increased, more knowledge is needed about the long-term effects of restoration efforts in such environments. There are benefits with using native species in restoration ... -
Movement and growth of European grayling Thymallus thymallus in two Norwegian rivers
(Master thesis, 2012)Dersom forflytningsmønster er et trekk som er stabilt gjennom livet, er det flere årsaker til å anta at det kan påvirke vekst i de tidligere livsstadiene hos harr (Thymallus thymallus). Siden vekst før kjønnsmodning hos ... -
On the Interaction between Rodents and Alpine Plant Communities
(Master thesis, 2012)Rodents with cyclic population dynamics are important herbivores in alpine areas with major effects on vegetation composition, biomass and diversity. Many places in Fennoscandia the population cycles in lemmings and voles ... -
Population characteristics and estimates of effective population size in a house sparrow metapopulation
(Master thesis, 2011)Effective population size (Ne) is a fundamental concept within biology and can be defined as the size of an ideal Wright-Fisher population in which the rate of genetic drift is the same as in the observed population. Natural ... -
Population regulation in the tadpole shrimp Lepidurus arcticus
(Master thesis, 2012)A metapopulation consists of several subpopulations that show limited degree of internal regulation, and are not viable alone in the long term. Instead, each subpopulation is sustained over time by migration and re-colonization ... -
Size dependency of spatial and temporal patterns of marine migration of sea trout (Salmo trutta L.) and Arctic char (Salvelinus alpinus (L.)) in Repparfjord Northern Norway
(Master thesis, 2011)Acoustic telemetry was used to study the movements and habitat use of sea trout (Salmo trutta L.) and Arctic char (Salvelinus alpinus (L.)) in Repparfjord in Northern Norway during July until October 2010. In total, 18 ... -
The effect of hydropeaking on density, diversity and species richness of mayflies (Ephemeroptera) and stoneflies (Plecoptera) in two river systems
(Master thesis, 2012)Hydropeaking corresponds to the management of hydropower resources where electricity is produced in accordance with prices and demand. Although fully justified economically, hydropeaking may have adverse consequences for ... -
The Effect of Restoration Treatments on the Regeneration Pathway in Alpine Seed Plants
(Master thesis, 2011)Question: How does nutrient addition and seeding affect revegetation of seed plants, and are the effects differing among the stages of the regeneration pathway? Location: Two roads restored in 2002, located in Hjerkinn ... -
Tree recruitment in the Forest-tundra Ecotone: Limitation and facilitation processes in contrasting climatic Regions
(Master thesis, 2012)Aim: The aim of this study was to analyse how abiotic and biotic constraint and facilitation agents determine tree recruitment in the alpine zone in climatically different regions as well as across species; Birch, pine and ... -
Variation in recruitment failure of moose (Alces alces) - any effects of population condition and climate?
(Master thesis, 2011)Summary1. Recruitment failure may represent an important demographic response to changes in the environment or in population size. In this study, I examined whether there was a positive relationship between recruitment ...