Sökning: "habitat selection"

Visar resultat 21 - 25 av 78 avhandlingar innehållade orden habitat selection.

  1. 21. Grouse - habitat relationships : monitoring, scale, and management

    Författare :Unni Støbet Lande; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Fennoscandian grouse populations are facing habitat degradation and are in decline, though not to the same degree as in western and central Europe. To be able to identify factors causing population decline and initiate proper management actions, a well functioning monitoring program and management are essential. LÄS MER

  3. 22. Food selection and fitness optimisation in insects

    Författare :Helene Bracht Jörgensen; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; food preference; nested PCR; fungal DNA; växtparasitologi; plant parasitology; Entomology; Entomologi; fungi; seeds; ground beetles; collembolans;

    Sammanfattning : To optimise fitness is a continuous process which assists species survival in changing environments. Choosing an optimal diet is an essential part of the optimisation process and a key element of optimal foraging theory. LÄS MER

  4. 23. Variation in Silene vulgaris and S. uniflora (Caryophyllaceae): genetic diversity, gene flow and habitat selection

    Författare :Helena Runyeon; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; taxonomy; Systematic botany; seed shapes; morphology; allele frequencies; hybridization; immigration history; allozymes; genetic diversity; geographic variation; Silene; Caryophyllaceae; phytogeography; chemotaxonomy. Physiology of nonvascular plants; Systematisk botanik; taxonomi; morfologi; kemotaxonomi. Växters fysiologi inte kärlväxter .;

    Sammanfattning : Genetic and morphometric variation was studies in the three closely-related taxa Silene vulgaris (a widespread weed), S. uniflora ssp. uniflora (restricted to coastal habitats) and S. uniflora ssp. LÄS MER

  5. 24. Evolution of Dispersal and Habitat Exploration in Butterflies

    Författare :Ulf Norberg; Hans Van Dyck; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Ethology and behavioural ecology; Etologi och beteendeekologi; etologi; Ethology;

    Sammanfattning : The development of wings may be one of the most important reasons for the great diversity among insects. Being able to move makes it possible to colonise new areas and explore resources in the surroundings. However, developing dispersal-related traits, like wings or flight muscles, is costly and moving can also be dangerous. LÄS MER

  7. 25. Host plant choice, habitat selection, dispersal ability and population structure of a threatened butterfly, Lopinga achine

    Författare :Karl-Olof Bergman; Linköpings universitet; []
    Nyckelord :;

    Sammanfattning : Host plant choice, habitat selection and dispersal ability of the red-listed butterfly Lopinga achine were studied in partly open woodland in the province of Östergötland. Females preferred to oviposit near Carex montana, although they did not attach their eggs to any plant. LÄS MER