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 31 for “"Floral traits"”.
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Pollination and the evolution of floral traits : selected studies in the Cape flora
… the role of pollinators in the evolution of floral traits in selected Cape plants, and to reach a better understanding of the relationship between floral adaptation and speciation. To establish a set of testable hypotheses, I asked specifically how adaptation to pollinators can explain three …
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Moth pollination, low seed set, and vestigialization of attractive floral traits in Abronia umbellata (Nyctaginaceae)
… 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 associated with the moth pollination syndrome translated into …
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Floral traits and pollination of Solidago altissima: mechanisms of local adaptation among and within biomes
… are not well understood. The evolution of floral traits is influenced by the trade-off between sexual and asexual reproduction. Floral traits can evolve rapidly, and this often occurs in response to interactions with pollinators. I found differences in floral traits between plants from the …
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The pollination biology of Haskap (Lonicera caerulea L.: Caprifoliaceae): floral traits and pollinator performance of a new Saskatchewan fruit crop.
… including associated pollinators and important floral characteristics. My research compared the pollinating performance of three groups of bees on Haskap: commercial Apis mellifera and Osmia lignaria, and wild Bombus spp. I found that Bombus queens had the highest levels of single visit pollen …
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Exploring strategies to enhance pollination and yield in the field bean, Vicia faba L.
… imperative that more is done to understand how floral traits of <i>V. faba</i> may be used to improve crop yield through pollinator attraction. In this project, novel variation has been identified between commercial lines of <i>V. faba</i> in reward, attraction, and access traits. Using this …
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Efekt zkušeností a květních vlastností na projev preferencí a věrnosti u Eristalis tenax
… pollen through their flower form (individual floral traits) are preferences and constancy of pollinators. The proportion of intraspecific pollen transfer increases with higher preferences or constancy of the pollinator. Pollinator preferences and constancy tend to change over its lifetime …
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The Evolution And Reproductive Ecology Of Oenothera (Onagraceae)
… 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 reproductive traits …
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Pollination biology of four co-occurring Erica species from the Cape Peninsula, South Africa
… flora, this has not been tested for the largest, florally diverse Cape 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 …
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Floral evolution of long-tubed Erica species
… 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 pollination syndromes. …
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The Evolutionary Dynamics of Conflicts of Interest in Plant Mating Systems
… matched by the diversity of mating systems and floral traits they exhibit. Since Darwin evolutionary biologists have been fascinated by this diversity and worked to explain and understand it. In this thesis I focus on aspects of the diversity in plant reproductive biology that is driven by …
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Evolution of floral and mating system variation in Camissoniopsis cheiranthifolia (Onagraceae): An evaluation of patterns and processes
Understanding how floral traits covary with one another and with mating patterns is an important step in understanding how and why mating systems evolve. I examined the evolution of floral and mating system variation in Camissoniopsis cheiranthifolia (Onagraceae), a species that exhibits divergence …
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Floral trait architecture in crop sunflower (<i>Helianthus annuus</i>) under drought conditions
… drought stress resistance in crop plants. Floral traits impact yield, especially in oilseed crops such as sunflower (<em>Helianthus annuus</em>), but their susceptibility to drought stress is understudied. The goal of this study was to describe the floral trait architecture of <em>H. …
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The reproductive biology of four geoflorous Protea species (Proteaceae)
… 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 multiple pollinator groups or …
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Variation in breeding systems and consequences for reproductive traits in Erica
… great inter- and intra-specific variation in floral form as well as in post-fire regeneration strategies. Previous studies of other plant groups (Barrett et al. 1996; Button et al. 2012) have illustrated changes in floral traits with a shift from outcrossing to selfing. The aim of this thesis …
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Investigating Damage, Genetic Correlations, and Natural Selection to Understand Multiple Plant Defenses in Passiflora incarnata
… produce multiple defenses if putative resistance traits do not reduce damage, forcing plants to rely on tolerance of damage instead. Furthermore, resource shortages caused by herbivore damage could lead to compensatory changes in expression and selection on non-defense traits, such as floral …
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Intraspecific variation in Erica coccinea
… populations. In addition to variability in floral characteristics such as colour, this species includes two distinct regeneration forms: a resprouter form which survives fire by resprouting from dormant buds in a swollen lignotuber, and a seeder form which does not survive fire, but whose …
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Evolutionary dynamics of mating systems in populations of North American Arabidopsis lyrata
… the offspring for early- and late acting fitness traits like germination rate, growth and time to flowering. I found inbreeding depression in only one late acting fitness trait, the increase in leaves 5 weeks after germination, to be significantly higher for self-incompatible than self-compatible …
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The Relative Roles of Herbivore- and Pollinator-mediated Selection on the Evolution of Floral Display in the Invasive Plant, Lythrum salicaria
Studies assessing the evolution of plant traits frequently focus on pollinators as the primary drivers of floral trait evolution. However, herbivores can also play a role, and, under some circumstances, may even impose stronger selection on floral display than pollinators. This is especially true …
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Evaluating the Evolutionary and Genetic Relationships of the Andean Orchids of Northwestern Ecuador
… <em>heteranthum</em>, acknowledging that floral traits in <em>Oncidium</em> are often highly plastic, and not indicative of species lines.</p>
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Unlocking the genetic diversity of the undomesticated rice relative Oryza longistaminata
… increased yield, super-ratooning ability, and floral traits conducive to hybrid rice production. The major obstacle to utilization of O. longistaminata in breeding programs is a breeding barrier which complicates interspecific hybridization with O. sativa, as well as the expense and difficulty …
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