Sökning: "nest density"

Visar resultat 1 - 5 av 6 uppsatser innehållade orden nest density.

  1. 1. Modelling habitat suitability index for golden eagle

    Master-uppsats, Stockholms universitet/Institutionen för naturgeografi

    Författare :Maya Johansson; [2020]
    Nyckelord :Golden Eagle habitat model; habitat suitability index; HSI; habitat modelling using GIS;

    Sammanfattning : The aim in this study was to develop a model for the probability of finding active golden eagle nests during their breeding season. It was done by using environmental variables derived from expert models which were tested against empirical data. LÄS MER

  3. 2. Hur påverkas skogslevande myror av den introducerade contortatallen?

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

    Författare :Mattias Andreasson; David Karlsson; [2020]
    Nyckelord :Pinus sylvestris; Pinus contorta; tall; Formicidae; myror; biodiversitet; boreal; skog;

    Sammanfattning : I Sverige finns det intresse för nyintroducerade trädarter inom skogsbruket s.k. exoter. Exoterna kan påverka skogens biodiversitet negativt. LÄS MER

  4. 3. Bumblebee resource dynamics : a review of foraging and nesting in the agricultural landscape

    Kandidat-uppsats, SLU/Dept. of Ecology

    Författare :Anna Douhan Sundahl; [2020]
    Nyckelord :bumblebees; bumblebee population dynamics; bumblebee drivers; flower strips; competition with honeybees; foraging; nesting; hibernation;

    Sammanfattning : 90 % of all plants on earth either benefits or entirely depends on pollination. There are pollinators among families of bees (Apidea), butterflies (Lepidoptera) and birds (Aves). Bees of genus Bombus spp., bumblebees, are especially important and provide pollination service for 80 % of the crops of Europe and many wild plant species. LÄS MER

  5. 4. Villages and valleys: connectivity and land use in Northern Messenia during Middle and Late Helladic periods.

    Master-uppsats, Uppsala universitet/Arkeologi

    Författare :Vasiliki Tsoumari; [2019]
    Nyckelord :Bronze Age; Middle Helladic; Late Helladic; GIS; spatial analysis; viewshed; visibility; kernel density estimation; least cost path; connectivity; Messenia; Greece;

    Sammanfattning : The use of past archaeological survey data for examination of landscape dynamics became very popular during the last decades of the 20th century, when Geographical Information Systems analysis were introduced in archaeology. In the present thesis, past survey data from Northern Messenia’s Middle and Late Helladic periods are combined to the topography and the environment of the region. LÄS MER

  7. 5. Restoration of natural disturbances: impact on distribution and performance of dominant ants (Formica spp.) by fire and gap dynamics

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

    Författare :Rebecca Larsson; [2015]
    Nyckelord :boreal forests; conservation management; honeydew harvesting efficiency; nest density; Sweden;

    Sammanfattning : Disturbance regimes caused by fire and wind storms used to be common features in the Swedish boreal forests. However, due to an intense forest management, these events have declined rapidly. LÄS MER