Search for dissertations about: "Pollination"

Showing result 16 - 20 of 65 swedish dissertations containing the word Pollination.

  2. 16. Evolution of Spur Length in a Moth-pollinated Orchid

    Author : Elin Boberg; Jon Ågren; W. Scott Armbruster; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Platanthera bifolia; floral evolution; natural selection; pollination; spur length; population differentiation; divergent selection; disruptive selection; reproductive isolation; Biology; Biologi; Ecological Botany; Ekologisk botanik;

    Abstract : There is considerable evidence that pollinator shifts can explain many differences in flower morphology between closely related plant species, but the extent to which pollinator shifts can explain the maintenance of among-population variation in floral traits within species is poorly known. In this thesis, I combined comparative and experimental approaches to examine the evolution of floral traits in the moth-pollinated orchid Platanthera bifolia. READ MORE

  4. 17. Understanding the adaptive capacity of the bumblebee Bombus terrestris across native and novel environments

    Author : Cecilia Hjort; Biodiversitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Bumblebees; Bombus terrestris; Pollination; Introgression; Single nucleotide polymorphisms; Whole Genome Sequencing; Landscape simplification; Gene flow; Morphology; Environmental variation; Invasion; Local adaptation; Island;

    Abstract : Anthropogenic stressors such as agricultural intensification, climate change, andincreased densities of non-native managed bees used for crop pollination arecontributing to bee declines. Understanding how and why bees have responded topast environmental changes is crucial for predicting future ones and enablingmitigation to maintain the functioning of both natural and agricultural ecosystems. READ MORE

  5. 18. Distribution patterns of fleshy-fruited woody plants at local and regional scales

    Author : Matilda Arnell; Ove Eriksson; Johan Ehrlén; Sara A.O. Cousins; Angela Moles; Stockholms universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fleshy fruits; woody plants; dispersal; distribution patterns; range filling; dispersal limitation; historical land use; spatial associations; point-pattern analysis; recruitment; reproduction; pollination; fruit set; fruit-removal; Daphne mezereum; Plant Ecology; växtekologi;

    Abstract : Fleshy-fruited woody plants share a long history with humans, providing us with food and wood material. Because of this relation, we have actively moved some of these plants across landscapes and continents. READ MORE

  6. 19. Pollination and fungal disease transmission : interactions between Viscaria vulgaris, Ustilago and insects

    Author : Ola Jennersten; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP;

    Abstract : .... READ MORE

  7. 20. To Bee or Not to Be : Critical Floral Resources of Wild-Bees

    Author : Magnus Larsson; Anders L Nilsson; Jon Ågren; Björn Cederberg; James H Cane; Uppsala universitet; []
    Keywords : Ecology; Andrena hattorfiana; Andrena marginata; Andrenidae; Knautia arvensis; limitation; oligolecty; pollen; pollination; solitary bee; specialist bee; Succisa pratensis; Ekologi;

    Abstract : In recent decades, the development of strategies to prevent or slow the loss of biodiversity has become an important task for ecologists. In most terrestrial ecosystems wild-bees play a key role as pollinators of herbs, shrubs and trees. The scope of this thesis was to study 1) pollinator effectiveness of specialist bees vs. READ MORE