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 9 of 9 for “"tri-trophic"”.
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Population Dynamics and Pattern Formation in an Info-chemical Mediated Tri-trophic Plankton Model
… dynamics that includes info–chemical mediated trophic interactions. We consider both a simplified two species model which has been studied in the literature (mostly in biological terms) and an extended, four-species model. In the latter, the grazing pressure of microzooplankton (M) on …
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The effect of copper stress on inter-trophic relationships in a model tri-trophic food chain.
… levels of Cu (0 – 200 mg kg -1) on growth, nutrient levels and the total plant proteins of wheat seedlings (Triticum aestivum) using pot experiments. A tri-trophic food chain soil → plant → herbivore → predator was established as plants were infested with grain aphids (Sitobion avenae) which …
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Prairie dogs, plants, and pollinators: tri-trophic interactions affect plant-insect floral visitor webs in shortgrass steppe
… species. These results suggest a significant tri-trophic interaction, driven by prairie dogs, which benefits insect floral visitors, including native pollinators. By altering vegetation, prairie dogs influence plant-pollinator networks in shortgrass steppe.
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Diet Breadth Evolution and Diversification of a Generalist Insect Herbivore
… no method to measure this combined effect (tri-trophic), so I developed a new approach to calculate the fitness associated with tri-trophic interactions using bi-trophic slopes. I use the relationship between fitness associated with top-down and bottom-up forces as well as the frequency of …
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Genetic differentiation of the parasitoid, Cotesia congregata (Say), based on host-plant complex
… and plants can affect parasitoid success in tri-trophic systems and thus, drive diversification. Genetic differentiation was estimated for Cotesia congregata (Say) collected from two distinct host-plant complexes, Manduca sexta L. on tobacco (Nicotiana tabacum L.) and Ceratomia catalpae, …
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Learning and Olfactory Processing by the Parasitic Wasp, Cotesia Congregata, In Response to Concentration of Herbivore Related Tomato Volatiles
… factor in understanding parasitoid behavior in tri-trophic interactions.</p>
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The effect of aphids in parasitoid-caterpillar-plant interactions
… pairwise interactions even though a species' distribution and abundance may be determined by interactions with many species within and between trophic levels. Multiple herbivores often share the same host and may interact indirectly by altering the relationships between herbivores, their host …
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Phylogenetics patterns of host utilization in two tropical Microgastrine parasitoid genera (Hymenoptera: Braconidae)
… history information for two separate microgastrine genera, Cotesia and Parapanteles, the data for which were collected over a number of years by two large scale rearing inventories, the Area de Conservación Guanacaste (ACG) inventory, Costa Rica and the Yanayacu Field Station, Ecuador. Using …
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Meccanismi di difesa e interazioni multitrofiche tra Solanum spp. e Tuta absoluta
… essere il motivo per cui nei bio-saggi olfattometrici vi era una maggiore attrattività per le piante pre-infestate rispetto a quelle sane sia per il fitofago che per il parassitoide. Questi aspetti sono supportati dai risultati dell'espressione di due geni che mostrano significativamente la …