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Visar resultat 1 - 5 av 33 uppsatser som matchar ovanstående sökkriterier.

  1. 1. Hyperspectral and multispectral satellite data analysis of nitrogen in grazed and ungrazed tundra in Långfjället, Sweden

    Master-uppsats, Göteborgs universitet/Institutionen för geovetenskaper

    Författare :Emma Dahlstedt; [2023-08-18]
    Nyckelord :Hyperspectral imaging; Imaging spectroscopy; Nitrogen; Reindeer; Herbivory; Tundra; Grazing;

    Sammanfattning : Reindeer are a keystone species in the circumpolar north, where they hold great cultural and ecological importance. Continued climate change threatens the long-term sustainability of reindeer husbandry. Reindeer can affect the tundra landscape, influencing the soil nutrient cycling, including the soil nitrogen availability. LÄS MER

  3. 2. Forest, Tree, and Shrub limit responses to a century of climate change in Northern Norway

    Master-uppsats, Umeå universitet/Institutionen för ekologi, miljö och geovetenskap

    Författare :Ella Björsbo; [2023]
    Nyckelord :Climate warming; growing season length; forest limit; tree limit; shrub limit;

    Sammanfattning : Climate changes have been observed in the Northern Hemisphere during the last century, causing a longer growing season and upslope expansion of forest, tree, and shrub limits. Here, a long-term historical perspective was used as a tool for investigating how climate change has impacted woody plants at the forest, tree, and shrub limits across the study region. LÄS MER

  4. 3. Reindeer grazing, soil wetness and aspect interact to drive tundra plant community structure in northern Sweden

    Master-uppsats, Stockholms universitet/Institutionen för naturgeografi

    Författare :Emma Gemal; [2023]
    Nyckelord :tundra plants; vegetation; abiotic vs. biotic effects; community composition; diversity; reindeer herbivory; accelerometry; grazing;

    Sammanfattning : The relative importance of abiotic versus biotic top-down factors on structuring tundra plant communities is debated. With climate change already strongly affecting the tundra ecosystem, understanding which factors will prevail is vital. LÄS MER

  5. 4. The secret life of moose : patterns of foraging and behaviour based on video collars

    Master-uppsats, SLU/Dept. of Wildlife, Fish and Environmental Studies

    Författare :cecilia Åström; [2022]
    Nyckelord :moose; alces alces; foraging; video footage; herbivory; browsing;

    Sammanfattning : To understand how moose forage in the wild, we have to study them without disturbing them then. Video cameras placed on moose are a novel method to study wild individuals without being intrusive. I analyzed video footage from four moose collars, filmed up to nine times a day and filmed from 4 to 11 months, for maximum of 4,5 minutes a day. LÄS MER

  7. 5. Direct and indirect effects of roe deer (Capreolus capreolus) herbivory on an island population of Chequered blue butterfly (Scolitantides orion).

    Master-uppsats, Uppsala universitet/Institutionen för biologisk grundutbildning

    Författare :Alexandra Johansson; [2021]
    Nyckelord :Scolitantides orion; Chequered blue butterfly; oviposition; oviposition behaviour; Indirect and direct effects; herbivory;

    Sammanfattning : Herbivory by ungulates is a known agent of disturbance in many ecological systems around the globe. At high abundances and through a selective foraging behaviour herbivory may inflict significant direct and indirect effects on local plant and animal communities. LÄS MER