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 “"phytophagous insects"”.
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Enzymatic defenses against plant phototoxins in phytophagous insects
Enzymatic defenses of phytophagous insects against two biosynthetically distinct types of plant phototoxins, furanocoumarins and $\beta$-carboline alkaloid, which are known to produce toxic oxygen species, were studied. Questions raised for the study were (1) Are antioxidant enzyme activity levels …
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Effects of Nutrients and Minerals on Growth and Detoxification in Phytophagous Insects
… vitamins, and minerals can affect the ability of phytophagous insects to utilize a hostplant. One way dietary deficiencies of these compounds may reduce insect performance is by affecting activities of detoxification enzymes, thereby altering susceptibility to host plant allelochemicals. In this …
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Experimental and Population Genetic Evidence of Host Race Formation in a Specialized Lycaenid Butterfly
Host-associated differentiation in phytophagous insects is an important mechanism of speciation. The current study investigates whether adaptation to different hosts drives population genetic divergence in the juniper hairstreak butterfly, Mitoura gryneus. Mitoura exhibit host plant fidelity, in …
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Effects of Prior Defoliation on the Timing of Life Cycle Events and Susceptibility to Natural Enemies of a Host Specific Gall-Former
In short lived phytophagous insects specialized to exploit specific plant tissues, phenological synchronization between plant and insect life cycle events is crucial and likely under selection. Here I report on past (1995-2001) and recent (2006-2007) patterns of emergence phenology and survivorship …
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Noise and signal transmission properties as agents of selection in the vibrational communication environment
… (Hemiptera: Membracidae) are host-specific phytophagous insects that communicate by sending vibrations through their host plants. Successful communication depends on the prevailing ecological and environmental conditions, which can affect communication behavior and the evolution of signals …
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Parallel and Nonparallel Patterns of Genetic Co-Differentiation: Evidence for Host Associated Differentiation Among Trophic Levels of the Oak Gall Wasp System
Populations of phytophagous insects whose life cycles are intimately related to their host plants can express host-associated differentiation (HAD) in the form of genetic divergence and/or RI isolation across alternative host plants. In this work, we ask if HAD cascades to higher trophic levels in …
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Neural processing of chemosensory information from the locust legs
Tarsal chemoreceptors in phytophagous insects can provide information on the chemical nature of the leaf surface, and are thus potentially important in host plant discrimination. Ovipositing Pieris brassicae, for example, drum the surface of leaves with their tarsi and tarsal chemoreceptors have …
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Taxonomy, phylogeny, and zoogeography of the weevil genus Euops (Insecta: Coleoptera: Curculionoidea) in the Papuan Region
… from Myrtaceae. Such a pattern is unusual among phytophagous insects and different scenarios for a host switch are discussed. Preliminary data on the association with fungi are provided. Fungi isolated from the mycetangia of different Euops species exhibit different mycological characters (e.g. …