Sökning: "orchids"
Visar resultat 1 - 5 av 9 avhandlingar innehållade ordet orchids.
1. Biotic and abiotic drivers of life-history and demographic variation in boreal orchids
Sammanfattning : 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. LÄS MER
2. Markets, mixtures and molecular methods : Investigating medicinal plant and edible orchid diversity in Tanzania and Zambia
Sammanfattning : 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. LÄS MER
3. Selection and Floral Evolution in Platanthera bifolia and P. chlorantha (Orchidaceae)
Sammanfattning : 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). LÄS MER
4. Floral evolution in deceit-pollinated orchids
Sammanfattning : .... LÄS MER
5. Evolutionary Ecology of Floral Traits in Fragrant Orchids
Sammanfattning : 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. LÄS MER