Sökning: "grassland species"

Visar resultat 21 - 25 av 57 avhandlingar innehållade orden grassland species.

  1. 21. Disturbance regimes in dry sandy grasslands – past, present and future

    Författare :Anja Ödman; Biodiversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Grassland conservation; sand steppe; land use history; conceptual model; soil disturbance; lime; nutrient availability; vascular plants; bryophytes; ground beetles; propagule supply;

    Sammanfattning : A number of sandy grassland habitats of interest for biodiversity conservation can be found in Europe. One such habitat is the threatened xeric sand calcareous grassland, which is home to a large number of endangered species. LÄS MER

  3. 22. Changes in plant community diversity and management effects in semi-natural meadows in southern Sweden

    Författare :Anna-Carin Linusson; Biologiska institutionen; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Plant ecology; Vegetation; Species diversity; Management intensity; Community diversity; Ordination; Växtekologi;

    Sammanfattning : The objectives of this thesis were to: 1) survey the vegetation in semi-natural meadows in south-central Sweden, 2) discern meadow vegetation changes in eight semi-permanent plots between studies performed in the 1960s and in 1990, 3) experimentally investigate the effects of variations in management intensity in one dry and one mesic meadow, 4) experimentally investigate the effects of different management practices or absence of management on species dynamics in meadow vegetation. 1. LÄS MER

  4. 23. Seed mobility and connectivity in changing rural landscapes

    Författare :Alistair G. Auffret; Sara Cousins; Robin Pakeman; Stockholms universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Biodiversity; Conservation; Functional connectivity; Historical ecology; Human-mediated dispersal; Invasive species; Landscape Ecology; Long-distance dispersal; Restoration; Seed bank; Seed dispersal; Seed rain; Structural connectivity; Physical Geography; naturgeografi;

    Sammanfattning : The success or failure of many organisms to respond to the challenges of habitat destruction and a warming climate lies in the ability of plant species to disperse between isolated habitats or to migrate to new ranges. European semi-natural grasslands represent one of the world's most species-rich habitats at small scales, but agricultural intensification during the 20th century has meant that many plant species are left only on small fragments of former habitat. LÄS MER

  5. 24. Birds and butterflies at the forest-farmland interface

    Författare :Dafne Ram; Biodiversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Conservation; Monitoring; Forestry; Grassland butterflies; Farmland birds;

    Sammanfattning : Land-use change is one of the greatest threats to biodiversity. Through intensification of land-use, the agricultural landscape has become more homogenous and a result, many species associated with traditional farmland or other semi-natural open habitats have declined. LÄS MER

  7. 25. Impacts of insect herbivory and nitrogen eutrophication on grassland ecosystems

    Författare :Pernilla Borgström; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : Nitrogen (N) eutrophication causes severe species richness declines in grassland ecosystems worldwide. Species interactions, for example between plants and herbivores, are likely to mediate the grassland’s response to increased N availability. LÄS MER