Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 14 of 14 for “"pollination ecology"”.
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Pollination ecology of Mesembs
… Succulent Karoo biome of South Africa. While its pollination ecology still remains largely unstudied, the system is thought to be overall generalised. This study sought to verify whether Mesemb species flowering during September and October in Vrolijkheit Nature Reserve have generalised or …
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The Pollination Ecology of Four Species of Local Vernal Herbaceous Angiosperms
The pollination ecology of four populations of vernal herbaceous angiosperms representing four locally common species of plants in the Central New York State area were studied. Three study sites were selected and research was conducted in the field by personal observation and accepted experimental …
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Pollination ecology of the simultaneously flowering Impatiens capensis and I. pallida
… depends on hummingbirds and small bees for pollination. Thus competition for pollinators between these Impatiens represents an important plant-plant and plant·pollinator interaction with potential consequences. When I. capensis is less frequented by bumblebees when sympatric with I. pallida, …
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Pollination Ecology, Self-incompatibility and Genetic Diversity in the Herbaceous Eastern North American Spring Ephemeral, Erythronium americanum
… study pollinator abundance and activity and hand pollinations were performed to examine pollen limitation and self-incompatibility. Novel molecular markers were developed and used to quantify genetic diversity, clonal diversity, and population structure. Hand pollination treatments (natural, hand …
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Pollination systems in Namaqualand : a response to a predictable winter rainfall regime
… limitation, necessitates further research in the pollination ecology of the region. In particular, research should concentrate on finding evidence for a reduction in fruit set resulting from pollen limitation. By furthering our knowledge in this aspect of the ecological functioning of Namaqualand, …
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VARIATION, ADAPTATION AND REPRODUCTIVE BIOLOGY IN RUPPIA MARITIMA L POPULATIONS FROM NEW HAMPSHIRE COASTAL AND ESTUARINE TIDAL MARSHES
… in morphology, reproductive strategy and pollination ecology in response to a range of environmental conditions. Variation among the populations correlates with seasonal changes in environmental conditions recorded at various sites. A comparison of coastal and estuarine habitats of Ruppia …
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Biosystematic and Ecological Investigations on Tuberous Aconitum (Ranunculaceae) of the United States
… with shallow nectaries are adapted to pollination by both short- and long-tongued bees, whereas bumblebee species with short tongues are not usually pollinators of flowers in populations with deep nectaries. In A. columbianum there are extreme interpopulation differences in rates of …
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The ecological and evolutionary drivers of spatial biodiversity patterns
… present empirical studies which link community ecology, macroecology, and macroevolution to better understand spatial diversity patterns in plants and lizards. Chapter Four integrates phenotypic and spatial data to look at what drives global patterns of species richness in ten different lizard …
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The ecological and evolutionary drivers of spatial biodiversity patterns
… present empirical studies which link community ecology, macroecology, and macroevolution to better understand spatial diversity patterns in plants and lizards. Chapter Four integrates phenotypic and spatial data to look at what drives global patterns of species richness in ten different lizard …
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So happy together? : Pollination and reproductive strategy of two sympatric species of Acanthus L. in Kenya
… firewood collection. This thesis focusses the pollination ecology of two species of Acanthus. A. eminens occupies clearings and riversides inside the forest, while A. polystachyus grows in copses and hedgerows of the surrounding farmland, as well as at the forest edge. Through forest …
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The pollination and scent ecology of selected Cape milkweeds (Apocynaceae: Asclepiadoideae)
… relationships. In South Africa, the pollination ecology of this diverse group has largely been focused in the summer rainfall region. This study focused on Western Cape species in the winter and summer-winter rainfall transition zones. The aim was to determine the pollinators of the …
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Landscape-scale habitat requirements of flower-visiting insects in the Nene Valley Nature Improvement Area
Recorded population declines of flower visiting insects are a cause for concern. The presence of an abundant and diverse community of insects is essential for ecosystem stability and continued agricultural prosperity. As human populations continue to increase so do the pressures on the natural …
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Biotic and Abiotic Drivers of Plant-Pollinator Interaction Rewiring
… the way in which pollinator removal influences pollination function. As a whole, this dissertation demonstrates that interspecific interactions cannot be considered static components of plant-pollinator communities. Rather, ecologists must consider how changes to biotic and abiotic conditions …
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Moth pollination, low seed set, and vestigialization of attractive floral traits in Abronia umbellata (Nyctaginaceae)
… much of which is thought to be associated with pollination by animals. Pollination syndromes are collections of floral traits (e.g. flower colour, shape, odour) that are associated with a plant attracting particular functional groups of animal pollinators. We explored the extent to which traits …