Sökning: "collembolans"

Visar resultat 1 - 5 av 6 avhandlingar innehållade ordet collembolans.

  1. 1. 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

  3. 2. Indirect biotic interactions in the rhizosphere

    Författare :Natalia Ladygina; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The rhizosphere (the soil environment around plant roots) is characterized by complex direct and indirect interactions among its organisms. Studies of interactions among organisms in the rhizosphere are difficult to carry out due to a high diversity of inconspicuous organisms on a micro scale and the highly heterogeneous nature of the soil environment. LÄS MER

  4. 3. The big picture from small landscapes : investigations of spatial patterns and processes using a model metacommunity

    Författare :Jens Åström; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Habitat fragmentation is a major current threat to natural environments. Still, fundamental questions of what influences ecological communities in spatially structured habitats are unanswered. In this thesis, microarthropods in moss patches were used in a model system, where both biotic and abiotic factors could be manipulated. LÄS MER

  5. 4. Colonization processes of soil fauna and mycorrhizal fungi

    Författare :Dagmar Gormsen; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Animal ecology; abandonment; land use; ectomycorrhiza; arbuscular mycorrhiza; lumbricid earthworms; Acari; soil fauna; collembola; Djurekologi; Microbiology; bacteriology; virology; mycology; Mikrobiologi; bakteriologi; virologi; mykologi;

    Sammanfattning : Colonization consists of two parts, a dispersal phase followed by establishment and reproduction at a new site. Dispersal behaviour influences survival and the access to resources and mates of individuals and is thus closely linked to an organism's fitness. LÄS MER

  7. 5. Springtails in space : factors structuring Collembola populations and communities, revealed by trait-based analyses

    Författare :Lina Ahlbäck Widenfalk; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : The relative influence of environmental conditions, biotic interactions and dispersal limitation for community structure and diversity patterns is a reoccurring theme in community ecology. In studies of soil fauna communities, small-scale horizontal and vertical variations in environmental variables and biotic interactions have often been disregarded, despite these being key factors to understanding the diversity of soil fauna communities. LÄS MER