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 16 of 16 for “"Pollination Syndrome"”.
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A squeaky suspicion : rodent pollination in Protea nana
The pollination syndrome of Protea nana has been described as uncertain throughout the literature. Floral morphology, presence of pendulous inflorescences
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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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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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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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Palynology of the Cape's top ten richest families and its taxonomic implications
… structure and are discussed in relation to their pollination syndrome aswell as their evolutionary trends. We also discuss the possibilities of creating a taxonomic key at species level, if not only for use at the vegetation-type scale for paleobotanists aswell as honey farmers.
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Taxonomic studies on the genus Crassula L
… several floral characters which form part of a pollination syndrome which is shown up by convergent developments of these flower types. The different types of seedling morphology recognized are considered in relation to the morphology of adult plants and their affinities at specific and …
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Rodent pollination in Androcymbium latifolium (Colchicaceae)
The repeated discovery of rodent pollination (therophily) has led to the concept of a rodent pollination syndrome. The adaptive plant traits that characterize this syndrome include flowers packed tightly into geoflorous and cryptic inflorescences, nocturnal anthesis and production of copious …
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Further studies with Melianthus L. : a molecular phylogeny, evolutionary patterns of diversification in the genus and pollinator syndromes
… indicate that the genus employs a generalist pollination syndrome, thus refuting suggestions of a co-exclusive relationship with sunbirds (Nectariniidae). Nevertheless, the genus is undeniably ornithophilous. Nectar studies reveal interspecific variation in both the volume and concentration of …
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The Reproductive biology of Erica pudens
… a diverse range of floral morphology and pollination systems. Even though it is such a diverse genus, there is minimal research examining the pollination biology of specific species. This research inspects the pollination biology of Erica pudens. To do this we carried out pollinator …
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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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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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Population dynamics and reproductive ecology of the gynodioecious prairie species Lobelia spicata Lam. (Campanulaceae)
… Lobelia, as well as patterns of variation in pollination type, floral compatibility and pollination syndrome for the closest relatives of L. spicata. It was found that the classification of Lobelia has undergone multiple transformations throughout history, but the most recent system divides …
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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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THE ANTAGONISTIC AND MUTUALISTIC PLANT-INSECT INTERACTIONS OF PITCHER’S THISTLE (CIRSIUM PITCHERI [TORR. EX EAT.] TORR. & A. GRAY, ASTERACEAE), A FEDERALLY THREATENED GREAT LAKES DUNE AND COBBLE SHORE ENDEMIC PLANT
… thistle flower heads indicating a generalist pollination syndrome. Generalist plants are often important floral resources that maintain plant-pollinator network structure, potentially as keystone species. I hypothesized that Pitcher's thistle is an important floral resource for the …
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Molecular Evolution of Anthocyanin Biosynthesis in Morning Glories
<p>Determining the genetic basis of adaptation has become a central focus of evolutionary biology, and the incorporation of increasingly sophisticated analytical tools from molecular biology has made identifying causal genes a practical reality. The work presented herein addresses the effects of …
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The Phenotypic Impact of Transgenic Flower Color Variation in Ipomoea quamoclit.
<p>Genetic engineering may be able to help address plant evolution questions by directly manipulating floral traits at the genetic level, in order to isolate individual traits and examine fitness associated with traits. Pleiotropy is a potentially confounding effect of this approach and must be …