Search for dissertations about: "pollination"

Showing result 1 - 5 of 52 swedish dissertations containing the word pollination.

  1. 1. Pollen and pollination in Ephedra (Gnetales)

    University dissertation from Stockholm : Department of Ecology, Environment and Plant Sciences, Stockholm University

    Author : Kristina Bolinder; Stockholms universitet.; [2017]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; aerodynamics; evolution; moonlight; pollination; pollen morphology; ultrastructure; Plant Systematics; växtsystematik;

    Abstract : Ephedra (Gnetales) is a gymnosperm genus with a long evolutionary history; the first dispersed pollen grains with affinity to the group are known already from the Permian. This thesis focuses on the evolutionary history of the group and different aspects of its pollination mechanisms. READ MORE

  2. 2. Pollination processes - maternal and offspring performance

    University dissertation from Stockholm : Botaniska institutionen

    Author : Kristina Holmén Bränn; Stockholms universitet.; [2007]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Pollination; Sinapis arvensis; Brassica napus; Raphanus raphanistrum; Succisa pratensis; Evolution of flower size; Maternal plant responses; Resource allocation; Reproductive success; NATURAL SCIENCES Biology Terrestrial; freshwater and marine ecology Terrestrial ecology; NATURVETENSKAP Biologi Terrestisk; limnisk och marin ekologi Terrestisk ekologi; Plant Ecology; växtekologi;

    Abstract : Pollination is one of the most important factors determining the reproductive success of plants. This thesis examines processes associated to varying pollination, with focus on plant responses. The first aim was to examine the possibility and constraints for short-term evolution of flower size in Raphanus raphanistrum. READ MORE

  3. 3. Pollinators and Insect Pollination in Changing Agricultural Landscapes

    University dissertation from Lund University, Faculty of Science, Centre for Environmental and Climate Research

    Author : Lina Herbertsson; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; Lunds universitet.; Lund University.; [2017-10]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; pollinators; pollination; agri-environment schemes; beekeeping; oilseed rape; sown flower strips; agri-environment measures;

    Abstract : Svensk sammanfattningKraftiga förluster av pollinerare är oroande och det har talats om risken för att en pollineringskris ska uppstå, med konsekvenser för både människor och miljö. De flesta blommande växter och tre av fyra odlade grödor är nämligen insektspollinerade (Box 1). READ MORE

  4. 4. The impact of forest on pest damage, pollinators and pollination services in an Ethiopian agricultural landscape

    University dissertation from Stockholm : Department of Ecology, Environment and Plant Sciences, Stockholm University

    Author : Ulrika Samnegård; Stockholms universitet.; [2016]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; agroforestry; Apoidea; Coffea arabica; crop pests; Ethiopia; forest cover; landscape ecology; moist afromontane forests; pollination; species composition; tropical agriculture; Plant Ecology; växtekologi;

    Abstract : The distribution of wild biodiversity in agroecosystems affect crop performance and yield in various ways. In this thesis I have studied the impact of wild biodiversity, in terms of trees and forest structures, on crop pests, pollinators and the pollination services provided in a heterogeneous landscape in southwestern Ethiopia. READ MORE

  5. 5. Pollination in Ephedra (Gnetales)

    University dissertation from Stockholm : Department of Ecology, Environment and Plant Sciences, Stockholm University

    Author : Kristina Bolinder; Stockholms universitet.; [2014]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; växtsystematik; Plant Systematics;

    Abstract : Pollination, i.e., the transport of male gametophytes to female gametophytes, can occur with biotic or abiotic vectors and is necessary for fertilization and completion of the lifecycle in all seed plants. READ MORE