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 20 for “"plant-insect interactions"”.
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Plant-insect interactions between female dogwood borer and apple
… from a previous, three-year study in two newly planted apple orchards were subjected to geostatistical analyses to examine the temporal and spatial patterns of infestation by larval dogwood borer and to gain further information about the spatial scales at which oviposition occurs. There were …
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Plant-plant and plant-insect interactions: Direct and indirect effects of plant neighbors
… herbivory acted synergistically in depressing plant growth (height, diameter, and vegetative mass) and reproduction (reproductive mass and time of flowering). In several experiments, competition and herbivory had a negative synergistic effect on reproductive mass, vegetative mass, and diameter …
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Stratospheric ozone depletion and plant-insect interactions: Effects of UVB radiation of generalist and specialist herbivores on a tropical tree and a temperate forb
I investigated effects of UVB radiation on plant-insect interactions using two plant-herbivore systems.
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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
… used for integrated pest management of invasive plant species but it is not without risks to native plants. I researched the non-target impacts of the biological control agent, the seed head weevil Larinus planus (Coleoptera: Curculionidae) on the Great Lakes dune and cobble shore endemic …
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The functional morphology of insect adhesive devices and its implications for ecology
… understanding of the constraints that affect insect adhesion with an emphasis on biological constraints such as plant defences against insects and the influence of abiotic factors on insect foraging. In chapter one of this theses, a literature review on the mechanisms of insect adhesion, the …
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AY-‐WB phytoplasma manipulations of host and non-‐host leafhopper interactions
Hempitera. In plant hosts, phytoplasmas induce physiological changes and in both hosts modulate plant-‐insect interactions. Previously, interactions have been examined with both hosts infected with phytoplasmas. Thus, it is unclear which organism the effect stems from or how phytoplasmas …
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Impacts of climate change on herbivore induced plant signaling and defenses
… phytochemistry which in turn influences the interactions between plants and insects. To examine the effect of elevated atmospheric CO2 and O3 concentrations on plant-insect interaction, I measured changes in transcription using microarray analysis of field-grown soybean (Glycine max). I found …
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Ecological Perspectives on Cannabis sativa Phytochemistry: Biotic Interactions and Abiotic Stress in Managed and Natural Systems
… chemically diverse and ecologically significant plant whose re-cent expansion across North American landscapes offers a unique opportunity to investi-gate the ecological roles of phytochemical diversity. While much attention has been given to cannabinoids for their commercial value, relatively …
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Eco-physiological and molecular manipulation of leaf-level primary and secondary metabolism by arthropod herbivory
… systems to evaluate conserved mechanisms of plant responses to herbivory. Documenting these responses from the observed and manipulated eco-physiological level down to the level of the gene can provide mechanistic understanding of how photosynthesis changes under herbivory and, ultimately, …
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Consequences of global redistribution on the ecology and evolution of the invasive weed Pastinaca sativa and its associated insect fauna
… oviposition by webworms to determine whether plants can experience selection to deter oviposition. In Chapter 4, I used ribosomal internally transcribed spacers (ITS) and chloroplast markers to determine the colonization history of wild and cultivated parsnips in three geographic regions: …
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Fitness and Physiology of the Hemlock Woolly Adelgid, Adelges tsugae, in Relation to the Health of the Eastern Hemlock, Tsuga canadensis
… Sternorrhyncha: Adelgidae) is a small invasive insect that frequently causes hemlock (Tsugae spp.) mortality in the eastern United States. Studies have shown that once healthy hemlocks become infested by the adelgid, nutrients are depleted from the tree, leading to both tree decline and a …
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Interactions between Bromus tectorum, grasshoppers, and native plants in sagebrush steppe communities
… preferred food source for herbivores than native plants, per capita feeding impacts may increase on natives, thus facilitating exotic proliferation. In sagebrush shrubland, grasshoppers are often the dominant herbivores. Their feeding patterns have been shown to limit and structure plant …
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Aboveground effects of variation in the legume-rhizobium mutualism on insect herbivore Spodoptera exigua
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2023-09-01 without embargo terms
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MECHANISMS OF SUCCESS: PLANT-HERBIVORE INTERACTIONS AND THE INVASION OF NON-NATIVE LONICERA SPECIES IN NORTH AMERICA
… have been proposed to explain how invasive plant species are often poor competitors in their native range, but dominant in their novel range including the enemy release and novel weapons hypotheses. Additionally, many invasive species are characterized as being tolerant and/or resistant to …
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CMV Infection Affects Bumblebee Pollination Behaviour and Plant Reproductive Success
Viruses can affect plant-insect interactions by altering emission of plant volatile organic compounds (VOCs). Previous work in the lab suggested that VOCs emitted by tomato (Solanum lycopersicum) plants infected with cucumber mosaic virus (CMV) were more attractive to bumblebees (Bombus terrestris) …
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Pheromones, nectar, and computer vision: investigating large-scale patterns of chemodiversity.
… and which allow natural products to mediate interactions across biological scales. Chemodiversity is a major component of functional biodiversity in all ecosystems, and in plant - insect interactions especially mediates mutualisms, antagonisms, defense, reproduction, and many more …
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Investigating Damage, Genetic Correlations, and Natural Selection to Understand Multiple Plant Defenses in Passiflora incarnata
<p>Plants commonly produce multiple, seemingly redundant defenses, but the reasons for this are poorly understood. The specificity of defenses to particular herbivores could drive investment in multiple defenses. Alternatively, genetic correlations between defenses could lead to their joint …
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Macroevolution and phylogenomics in the adaptive radiation of Heliconiini butterflies
… role of coevolution with the obligatory host plants Passiflora is examined with the aid of a new phylogeny of the passion vines. Evidence is found for diffuse coevolution, as the diet of most Heliconiini is not predicted by their phylogeny and varies at short timescales. Although passion vine …