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 20 of 20 for “"pollination syndromes"”.
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Pollination biology of four co-occurring Erica species from the Cape Peninsula, South Africa
… genus Erica. Speciation studies that focus on pollination biology often use floral syndrome characters to predict a species' functional pollinator group/s. The predictive power of these techniques has come under scrutiny, and hence in-situ observations have become highly important for …
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The reproductive biology and ecology of Colchicum (Colchicaceae) in southern Africa
… by pollinators has led biologists to define pollination syndromes. These syndromes reflect patterns of convergent evolution and serve to generate hypotheses about potential pollinators based on a plant's morphological characteristics (Faegri and van der Pijl, 1979; Johnson and Steiner, 2000).
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Floral evolution of long-tubed Erica species
… in the Cape and exhibits a diversity of pollination syndromes and floral traits. This makes Erica well-suited to study the evolution of floral traits and how they impact speciation. The first chapter explored the role of ultraviolet colouration by recording its prevalence across Erica …
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Pollinator-syndrome driven changes in the mating systems of two Cape legume species
… of closely related species differing only in pollination syndromes. Furthermore, it has been hypothesized that Non-Flying Mammal Pollination (NFMP) arises from a bird pollinated ancestor as a result of their limited distributions. Liparia splendens subsp. splendens and L. parva are two …
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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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A Comparative Study of the Reproductive Biology of Sympatric Morning Glories (<em>Ipomoea</em>-convolvulaceae)
… <em>Ipomoea</em> flowers examined based on the pollination syndrome concept. Despite the recent caveats raised about the lack of rigorous fit between floral traits and pollinator fauna over large floras, the pollination syndrome concept adequately explained pollinator preferences in …
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The Evolution And Reproductive Ecology Of Oenothera (Onagraceae)
This dissertation describes the role of pollination in the floral diversification of Oenothera with an integration of both ecological and phylogenetic approaches. Oenothera: Onagraceae) is a model system for studying plant reproductive biology. It provides excellent examples of shifts in …
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Certain syndrome or complex conundrum? : the pollination of Erica lanuginosa
… by a rodent. Flowers excluded from external pollination showed no seed set, hence it is not considered to be self-pollinated. Nectar analysis are inconclusive as an indicator of pollination syndrome. Entomophily by a robust insect with a medium length proboscis is considered unlikely due to …
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Pollination Biology of Gentianales in a Southern Ecuadorian Montane Forest
The pollination and reproductive biology of mostly small flowered, taxonomically related species of the monophyletic order Gentianales (Apocynaceae including Asclepiadoideae, Gentianaceae, and Rubiaceae) was investigated in a tropical montane forest in southern Ecuador. This study is part of an …
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Intraspecific variation in Erica coccinea
… Region, with a large range of habitats, pollination syndromes and fire survival strategies. Erica coccinea, like many other Cape Erica species, has high intraspecific variability between populations. In addition to variability in floral characteristics such as colour, this species …
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Evolution of floral morphology in Brunsvigia and Crossyne (Amaryllidaceae)
Floral morphology and its relationship to pollination syndromes is examined, for the genera Brunsvigia and Crossyne (Amaryllidaceae). These two genera have similar vegetative morphologies and share the same mode of seed dispersal (anemogeochory). They differ in their floral and inflorescence …
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Variation in breeding systems and consequences for reproductive traits in Erica
… Seed and fruit set data obtained from hand-pollination treatments suggested that self- fertilization occurs rarely. Autonomous selfing did not generally yield significant seed set. When comparing changes in floral traits with increased selfing ability and pollination syndromes weak …
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Neglected pollinator syndromes in seasonally inundated Renosterveld
… the Western Cape, to determine their pollinator syndromes, and to evaluate the relative importance of monkey beetles (Scarabaeidae: Rutelinae: Hopliini) and relatively short-tongued horseflies (Tabanidae) in their pollination. Detailed observations showed that all the plants investigated are …
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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 …
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The reproductive biology of four geoflorous Protea species (Proteaceae)
Pollination systems of previously unstudied plant species are often inferred from floral traits that are shared among unrelated plant taxa. However, these ‘pollination syndromes’ are often not reliable predictors of the primary pollinator of a plant species, and may in fact represent adaptations to …
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Synthetic and ecological chemistry of natural products and analogues from sexually deceptive Chiloglottis orchids
… of sexually deceptive Chiloglottis orchids. Pollination by deception is a well documented phenomenon, particularly in the Orchidaceae, however only in recent decades has the chemical mimicry that so often drives these pollination syndromes become the subject of enquiry. This report commences …
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Synthetic and ecological chemistry of natural products and analogues from sexually deceptive Chiloglottis orchids
… of sexually deceptive Chiloglottis orchids. Pollination by deception is a well documented phenomenon, particularly in the Orchidaceae, however only in recent decades has the chemical mimicry that so often drives these pollination syndromes become the subject of enquiry. This report commences …
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Characteristics of Nectar Production and Standing Crop in <em>Campsis radicans</em> (Bignoniaceae).
<p>We examined several aspects of nectar production in <em>Campsis radicans</em> to better understand how standing crop is affected and how production affects pollinator visitation. In all experiments, nectar and concentration of flowers were measured and total sugar was calculated. Flowers do not …
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Evolution of Floral Morphology and Symmetry in the Miconieae (Melastomataceae)
… of the species requiring specialized “buzz pollination” by bees. However, previous research in Miconieae documented several instances of convergent evolution of phenotypes associated with generalized pollination strategies. I explore morphological evolution of Miconieae in a phylogenetic …