Search for dissertations about: "perching"

Found 4 swedish dissertations containing the word perching.

  2. 1. The evolution of territoriality in butterflies

    Author : Martin Bergman; Christer Wiklund; Ronald Rutowski; Stockholms universitet; []
    Keywords : territoriality; Lepidoptera; sexual selection; mating success; mate locating behaviour; resource-holding potential; motivation; courtship solicitation; NATURAL SCIENCES; NATURVETENSKAP; zoologisk ekologi; Animal Ecology;

    Abstract : Competition over mating opportunities is a conspicuous characteristic of animal behaviour. In many butterfly species the males establish territories in places advantageous for encountering females. This thesis addresses questions about how territoriality has evolved and is maintained in butterflies. READ MORE

  4. 2. Good enough? Animal welfare in organic poultry production

    Author : Lina Göransson; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Abstract : Outdoor access, reduced stocking densities, natural light, no beak trimming, and ‘slow-growing’ broilers provided with raised sitting areas, are some of the main features of organic poultry production intended to improve bird welfare. On-farm studies are important to increase our knowledge of animal welfare in commercial production. READ MORE

  5. 3. Through the eyes of a woodpecker: Understanding habitat selection, territory quality and reproductive decisions from individual behaviour

    Author : Ola Olsson; Biodiversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; reproductive success; territory quality; habitat selection; giving-up density; Bayesian processes; foraging; Picidae; lesser spotted woodpecker; Dendrocopos minor; conservation; Animal ecology; Djurekologi;

    Abstract : In this thesis I present some connections between foraging behaviour and reproductive success, time budget, tree species use, and habitat selection. The thesis is based upon both theoretical and empirical work. All empirical studies concern a south Swedish population of lesser spotted woodpeckers Dendrocopos minor, studied between 1990 and 1996. READ MORE

  6. 4. Predation and shorebirds: predation management, habitat effects and public opinions

    Author : Daniel Isaksson; Göteborgs universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Conservation; waders; predation; coastal pastures; redshank; lapwing; attitudes; human dimensions;

    Abstract : Many shorebird populations are rapidly declining and a high nest predation rate is one of the threats facing these populations. Thus, factors that affect predation and how to manage it in an effective way are receiving increased attention. READ MORE