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 12 of 12 for “"herbivore damage"”.
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Investigating Damage, Genetic Correlations, and Natural Selection to Understand Multiple Plant Defenses in Passiflora incarnata
… The specificity of defenses to particular herbivores could drive investment in multiple defenses. Alternatively, genetic correlations between defenses could lead to their joint expression, even if possessing both defenses is non-adaptive. Plants may produce multiple defenses if putative …
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MECHANISMS OF SUCCESS: PLANT-HERBIVORE INTERACTIONS AND THE INVASION OF NON-NATIVE LONICERA SPECIES IN NORTH AMERICA
… as being tolerant and/or resistant to both damage and limitations in abiotic resources. These hypotheses are based on plant-plant, plant-microbial, and plant-herbivore interactions in the invaders novel range and are not mutually exclusive. The genus Lonicera (Caprifoliaceae) includes …
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An investigation into the rapidly induced chemical responses of Myrica gale to insect herbivory
… plants (the controls) were kept free of insect herbivores while a second set sustained capsid bug herbivory. The terpenoid and phenolic profile of leaves from each set was obtained on a weekly basis using GLC and IIPLC respectively. GC-MS was used to identify constituents of the volatile oil. …
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Plant Defensive Traits: Translation of Their Effects on Herbivorous Insects Into Reduced Plant Damage (Evolution, Feeding Compensation, Predation)
… traits can have four basic negative effects on herbivores: reduced individual growth, reduced population growth, directly lethal effects, and reduced preference for the plant. The first part of this thesis provides a theoretical overview of the potential mechanisms through which these negative …
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The natural enemies of Asparagus asparagoides (L.) Wight in South Africa and their potential for use as biological control agents in Australia
… not found. Experimental results illustrated that herbivore damage to the above ground parts of the plant resulted in reduced tuber mass and also impacted negatively on fruit production.
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Foliar Herbivory on Understory Oaks as a Function of Forest Type and Prescribed Burning
… of oak seedling and sapling leaf area to insect herbivores has not been well characterized in Ozark forests, but may be a critical variable affecting current and future forest health. This study quantified loss of oak seedling and sapling leaf area to insect herbivores in recently burned or …
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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
… 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 when the traits under selection are linked to anti-herbivore defense. Here I describe a …
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Mechanisms Promoting Spatial and Temporal Variability in Plant Defense
… fields, I quantified the spatial structure of herbivore damage and goldenrod resistance, tolerance, and fitness traits, and assessed whether the spatial structure of defense was correlated with edaphic conditions and neighboring plant community. I then conducted a common garden experiment to …
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Abiotic and Biotic Factors Shaping Plant-Microbe Interactions
… entirely different directional outcomes for herbivore performance. In Chapter III, we explored whether soil microbes from three distinct ecological communities across a successional gradient differentially influenced plant defense strategies against herbivores. We found evidence that soil …
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Influence of leaf traits, hydrodynamics and global change on seagrass-grazer interactions
… global change enhance seagrass consumption by herbivores. In addition, this Thesis shows how seagrass colonization states affect to compensatory responses derived by herbivore damage. The importance of considering biotic processes in conservation and management plans is emphasized in order to …
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Understanding How Whole Genome Duplication in Plants Impacts Herbivore-plant Interactions
<p>Herbivory by insect herbivores is a strong selective force in many communities. Although herbivore-plant interactions have been a focus of interest for decades, we are still exploring how large-scale genetic changes in the host plant alters their interactions with insect herbivores. One such …
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Functional genomics of plant compensatory responses
… in fitness relative to those that are undamaged (see Stowe et al. 2000 for a review); such plants are termed as tolerant. This trait motivated many empirical studies demonstrating that herbivore damage can, under certain circumstances, increase, rather than decrease, plant reproductive …