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.
Results
Showing 1 to 14 of 14 for “"Generalist herbivores"”.
-
Competition and Community Interactions of Two Generalist Herbivores
… yet most research on indirect competition among herbivores focuses on dietary specialists, and those studies that do include generalists tend to rear them on agricultural crops. My project examines species interactions at three levels: intraspecific competition (within species), interspecific …
-
NO SIMPLE TRADEOFFS: CENTAUREA PLANTS FROM AMERICA ARE BETTER COMPETITORS AND DEFENDERS THAN PLANTS FROM THE NATIVE RANGE
… evolutionarily naïve plants, microbes, and generalist herbivores than against those species that have evolved tolerance in their communities of origin. I explored the potential for novel allelopathic or herbivore defense biochemicals as a potential alternative mechanism to tradeoff-driven …
-
NO SIMPLE TRADEOFFS: CENTAUREA PLANTS FROM AMERICA ARE BETTER COMPETITORS AND DEFENDERS THAN PLANTS FROM THE NATIVE RANGE
… evolutionarily naïve plants, microbes, and generalist herbivores than against those species that have evolved tolerance in their communities of origin. I explored the potential for novel allelopathic or herbivore defense biochemicals as a potential alternative mechanism to tradeoff-driven …
-
Modeling Sex-Specific Seasonal Habitat Selection for Elk (Cervus Elaphus) in Central Washington
Elk (<em>Cervus elaphus</em>) are generalist herbivores, exploiting a variety of environments. I studied habitat selection and sexual segregation of the Colockum elk herd in central Washington. I used a resource selection probability function (RSPF) to evaluate habitat use by males and females …
-
Ecology and management of wireworms (Coleoptera: Elateridae) in conventional and organic production systems
… stage of click beetles (Coleoptera: Elateridae), generalist herbivores that feed on a wide range of crops and cause serious damage. Wireworm management is challenging due to their long life cycle, subterranean habitat, wide range of host plants, and lack of effective chemical approach in most …
-
Specificity in the ecology and evolution of plant defense against herbivores: Identity and history
… and specificity of plant responses to herbivores. I examined variation in growth and herbivore defense allocation in a model woody invader, using native and invasive populations of Triadica sebifera that differed in historic herbivore pressure. Greenhouse studies demonstrated that …
-
An experimental demographic approach to exotic plant success: <b>Cynoglossum officinale</b> in its native and introduced ranges
… and to determine the role of specialist herbivores and altered responses to disturbance in affecting plant population growth in both ranges.</p> <p>From reciprocal common gardens in each range, I found substantial population-level plasticity in size and fecundity between native and …
-
An experimental demographic approach to exotic plant success: <b>Cynoglossum officinale</b> in its native and introduced ranges
… and to determine the role of specialist herbivores and altered responses to disturbance in affecting plant population growth in both ranges.</p> <p>From reciprocal common gardens in each range, I found substantial population-level plasticity in size and fecundity between native and …
-
Effects of Local Plant Neighborhood on Plant Herbivory in Perennial Polyculture Cropping Systems
… and wheat fields supported comparable numbers of herbivores, suggesting that herbivore densities in grasslands are not any more limited by predators and parasitoids than herbivore densities in wheat fields. The second chapter examined insect herbivore foliar feeding on a legume, Desmanthus …
-
SURVIVAL IN THE FOREST UNDERSTORY: RESILIENCE AND RESISTANCE TO DAMAGE IN NATIVE AND INVASIVE WOODY PLANTS
… in 20 native and invasive species, coupling generalist herbivore feeding trials with leaf defense trait assays. I found that invasive species have higher leaf lignin and nitrogen concentrations than native species, but generalist caterpillars showed no nativity preference, suggesting that …
-
The Ecology, impacts and control of Crassula helmsii.
… how C. helmsii abundance was affected by generalist herbivores, and whether C. helmsii abundance was related to the presence or absence of co-occurring plant competitors. To investigate how C. helmsii abundance is related to the abiotic environment, firstly field data were collected of pH, …
-
MECHANISMS OF SUCCESS: PLANT-HERBIVORE INTERACTIONS AND THE INVASION OF NON-NATIVE LONICERA SPECIES IN NORTH AMERICA
… to assess the performance of a specialist and generalist herbivore on native and non-native Lonicera species. Tolerance of mature shrubs was evaluated through measures of growth responses after repeated clipping. Greenhouse experiments with real and simulated herbivory were completed to …
-
Diet Breadth Evolution and Diversification of a Generalist Insect Herbivore
<p>Insect herbivores are one of the most diverse groups of multicellular organisms, and the vast majority are specialists, which feed on only a few plant species. The factors that cause some herbivores to be specialists and others to be generalists are still unclear. It is known that the selective …
-
Effects of Plant Invasions on Birds Breeding In Desert Grasslands
… Abundances of most predators and specialist herbivores decreased as dominance of nonnative grasses increased, whereas abundances of most generalist herbivores were lowest at intermediate points of nonnative dominance. These changes in the arthropod community can alter broad-scale ecological …