Sökning: "Djurekologi"

Visar resultat 6 - 10 av 57 avhandlingar innehållade ordet Djurekologi.

  1. 6. On starlings and farming: population decline, foraging strategies, cost of reproduction and breeding success

    Författare :Måns Bruun; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; breeding success; foraging strategies; intensification; agricultural methods; population decline; farmland bird; cost of reproduction; Animal ecology; Djurekologi;

    Sammanfattning : The European Starling Sturnus vulgaris as many other farmland bird species has been declining during the last decades. The cause of these declines is generally believed to be changes with in agricultural methods affecting breeding and survival of birds. LÄS MER

  3. 7. Bird orientation: external cues and ecological factors

    Författare :Johan Bäckman; Evolutionär ekologi; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; tracking radar; Emlen funnel.; Animal ecology; Djurekologi; oscillatory orientation; roosting flight; scatter; concentration; heading; cue calibration; light dependent; magnetoreception; subcutaneous fat stores; body condition; energetics; geomagnetic field; visual cues; orientation; birds; migration;

    Sammanfattning : Birds are generally capable of accurate orientation. In this thesis I present studies about the external cues and the ecological factors that influences bird orientation. A multitude of environmental cues are used to select and maintain a proper direction. LÄS MER

  4. 8. Game theory studies on aggressive behaviour

    Författare :Magnus Enquist; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Zoologi; Djurekologi; Djurpsykologi; Aggression;

    Sammanfattning : .... LÄS MER

  5. 9. Insect Diversity in Changing Landscapes

    Författare :Markus Franzén; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; växtparasitologi; Entomologi; plant parasitology; Zoology; Zoologi; Entomology; Ekologi; Ecology; butterfly; bee; dispersal; extinction; Djurekologi; Animal ecology;

    Sammanfattning : During recent decades, concern about the loss of biodiversity has increased. To change this negative trend there is an urgent need for effective conservation measures and there are ample evidence that conservation of organisms without an understanding of their ecology and behaviour is impossible. LÄS MER

  7. 10. Bioaccumulation and cycling of hydrophobic organic contaminants by Baltic Sea blue mussels, Mytilus edulis L

    Författare :Michael Gilek; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Musslor; Bivalvia; Djurekologi; Djurpsykologi;

    Sammanfattning : .... LÄS MER