Search for dissertations about: "orchids"

Showing result 1 - 5 of 9 swedish dissertations containing the word orchids.

  2. 1. Biotic and abiotic drivers of life-history and demographic variation in boreal orchids

    Author : Matthew R. Tye; Nina Sletvold; Yvonne Buckley; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Plant demography; life-history; climate; pollination; compensation; orchids; resources; Biology with specialization in Ecological Botany; Biologi med inriktning mot ekologisk botanik;

    Abstract : Environmental interactions, including both abiotic and biotic factors, are key drivers of life-history and population dynamics. Despite this, most population studies do not explicitly link variation in environmental factors and vital rates. READ MORE

  4. 2. Markets, mixtures and molecular methods : Investigating medicinal plant and edible orchid diversity in Tanzania and Zambia

    Author : Sarina Veldman; Hugo J. de Boer; Tinde R. van Andel; Barbara Gravendeel; Joseph N. Otieno; Julie Hawkins; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; DNA barcoding; Africa; Species delimitation; Orchids; Medicinal plants;

    Abstract : Medicinal plants are an important source of primary healthcare for many people in Tanzania. These medicinal plants are harvested from the wild, and increasing commercial trade poses a serious threat to local plant populations. Currently it is unknown which species are traded and in what amounts. READ MORE

  5. 3. Selection and Floral Evolution in Platanthera bifolia and P. chlorantha (Orchidaceae)

    Author : Johanne Maad; Charles B. Fenster; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Evolution; phenotypic selection; male function hypothesis; mating systems; floral shifts; orchids; pollination; moth pollinators; Platanthera.; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; systematisk botanik; Systematic Botany;

    Abstract : Natural selection mediated by pollinators has influenced the evolution of floral diversity of the flowering plants (angiosperms). The scope of this thesis was to study: 1) phenotypic selection, 2) mating systems, and 3) floral shifts involved in plant speciation. Model plant species were Platanthera bifolia and P. chlorantha (Orchidaceae). READ MORE

  6. 4. Floral evolution in deceit-pollinated orchids

    Author : Anna-Lena Fritz; Uppsala universitet; []
    Keywords : NATURAL SCIENCES; NATURVETENSKAP; Orkidéer; Orchidaceae; Reproduktion; Växtekologi;

    Abstract : .... READ MORE

  7. 5. Evolutionary Ecology of Floral Traits in Fragrant Orchids

    Author : Elodie Chapurlat; Nina Sletvold; Jon Ågren; Magne Friberg; Kathleen Kay; Uppsala universitet; []
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; agents of selection; diurnal and nocturnal pollination; divergent selection; field experiment; floral evolution; floral scent; Gymnadenia conopsea; Gymnadenia densiflora; Orchidaceae; phenotypic selection; pollinator-mediated selection; spatial variation; scent rhythm;

    Abstract : Why are flowers so diverse? Much of floral evolution is thought to be driven by pollinator-mediated selection. However, the connection between macroevolutionary patterns of floral diversity and microevolutionary processes remains poorly understood. In this thesis, I have used the fragrant orchids Gymnadenia conopsea s.s. READ MORE