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 46 for “"chemical ecology"”.
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Chemical Ecology of Clytini (Coleoptera: Cerambycidae)
In chapter six, I characterize the contact sex pheromone of N. a. acuminatus. Males recognize female conspecifics only after contacting them with their antennae. I characterize the behavior and demonstrate that three methylalkanes present in the wax layer of females are sufficient to elicit a …
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Comparative chemical ecology, behaviour, and evolutionary genetics of acanthodactlylus boskianus (Squamata: Lacertidae) : comparative chemical ecology, behaviour and evolution
… evolution of A. boskianus. These are behaviour, chemical and DNA analyses techniques.Behavioural bioassays in different experiments showed that the femoral gland secretions are used in communication between the lizards. Communication includes possible roles in mate choice, agonistic behaviour …
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Host plant associations and chemical ecology of Cerambycidae
… continued growth of international trade. Semiochemicals, particularly volatile pheromones, are an effective way to attract a number of cerambycid beetles to traps. The focus of my dissertation research was to evaluate current trapping methods and potential ways of optimizing these methods. I …
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The chemical ecology of Lingulodinium polyedra and its microbiome
… bacteria have some unique genomic features. The chemical data show that the neutral and growth-promoting species of Oceanicaulis spp. have highly similar metabolomes in neutral media, but differ in cyst-conditioned media, showing that they respond differently to the perceived presence of a cyst …
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Pheromones in Heliconius butterflies: Chemical ecology, genetics, and behaviour
Sex pheromones are chemical signals that mediate communication between males and females of a species and are important for mating. They have been well-studied in female moths, where females release volatile compounds to attract males over long distances. Butterflies fly during the day and were …
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Exocrine glands in Erotylidae (Coleoptera, Cucujoidea): chemical ecology, morphology and evolution
In most insect orders chemical defence is highly important and a multiplicity of partly spectacular defence mechanisms were described in the last years. It is well known that members of the Erotylidae show a particularly rich equipment of exocrine compound glands. However, morphology and …
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Comparative chemical ecology of invasive Depressaria species (Lepidoptera: Depressariidae) varying in hostplant specificity
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2024-05-01
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Effects of habitat and plant volatiles on mosquito spatial, seasonal, and chemical ecology
… eggs. Mosquitoes interpret and respond to chemical volatiles very differently depending on their environment (temperature, humidity, time of day, etc.) and species-specific host preferences (humans, mammals, etc.). However, the impact of ecological factors on mosquito prevalence, …
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Exploring Mosquito Thermal Biology and Chemical Ecology in the Context of Host-Seeking and Climate Change
… to bring novel insight into the biology and ecology of these mosquitoes. The first project focuses on the thermal preference and response to thermal cues of three Culex species which vary in host preference and climate of origin. The second project explores the effects of different rearing …
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Chemical Ecology of Defense Compounds in Anasa Species (Heteroptera: Coreidae) and Volatile Attractants for Diabrotica Species (Coleoptera: Chrysomelidae) (Attractants, Glands, Corn Rootworms, Electron Microscopy, Squash Bug)
Two separate investigations of insect chemical ecology were conducted. The first study elucidated the ultrastructure of the metathoracic scent glands of Anasa tristis and the chemical composition of secretions from the metathoracic glands of A. tristis and A. armigera and the abdominal glands of A. …
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Fruit chemical traits shape bat nutritional ecology: from basic science to applications
… 2-4) while applying insights from basic chemical ecology to inform forest regeneration strategies (Chapter 5). The studies were conducted in northeastern Costa Rica at La Selva Biological Station. Chapter Two examines the variability and associations between nutrients and secondary …
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Studies of the mechanisms involved in host finding and mating behaviour of the African coffee white stem borer, Monochamus leuconotus (pascoe) (Cleoptera: Cerambycidae)
… African countries. Very was known about the chemical ecology of M. leuconotus prior to the initiation of the studies described in this thesis. The objectives of this work were to investigate the mating behaviour in order to look for evidence of the existence of chemical interactions between …
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Investigations of the integrated pest management of Colorado potato beetle, Leptinotarsa decemlineata (Say): Host plant preference, development of semiochemical-based strategies, and evaluation of a novel insecticide
Exploiting the chemical ecology of an insect can unveil novel strategies for its pest management. Though much has been learned about the chemical ecology of Colorado potato beetle (CPB), Leptinotarsa decemlineata (Say) (Coleoptera: Chrysomelidae), a major pest of solanaceous crops in the U.S., …
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Behavioral and molecular mechanisms of pheromone transmission in the honey bee (Apis mellifera)
… and (E)-beta-ocimene. By integrating behavior, chemical ecology, and transcriptomics, this dissertation analyzes several key stages in signal transmission in a systematic effort to understand how these two pheromones affect behavior, and in the process, generates a synthetic understanding of a …
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Investigation of Specialized Metabolites in Apicomplexan Parasite Life Cycles
… Efforts were devised to understand the chemical ecology surrounding malaria parasites during the mosquito stage to ultimately reduce transmission. Through structure-, bioinformatic-, and coculture-guided approaches, we have uncovered chemical space within the mosquito-microbiome and …
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Pheromones, nectar, and computer vision: investigating large-scale patterns of chemodiversity.
At its core, chemical ecology attempts to describe the complex forces that generate the vast chemical diversity observed in nature and which allow natural products to mediate interactions across biological scales. Chemodiversity is a major component of functional biodiversity in all ecosystems, and …
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Pheromone chemistry and reproductive isolation in the subfamily Lamiinae (Coleoptera: Cerambycidae)
Research on the chemical ecology of cerambycid beetles has revealed that the pheromone chemistry of related species is often highly conserved. Sympatric species often share pheromone components, even having identical attractant pheromones. For example, many cerambycines native to different …
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Biotic and abiotic mechanisms shaping multi-species interactions
… interactions critical for understanding the ecology and evolution of organisms. This dissertation includes four data chapters that examine the biotic and abiotic mechanisms that shape multi-species interactions in both tropical and temperate ecosystems. The first three data chapters (Chapters …
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The role of preen oil and body odour in birds
… olfactory cues by analysing the variation in the chemical composition of preen oil. In a systematic review (Chapter 2), I found that almost all bird species studied exhibit seasonal changes in preen oil composition, whereas only half of bird species studied show sex differences. Why would seasonal …
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Ecology and Synthetic Biology as Tools for Natural Products Discovery From Marine Proteobacteria
The discovery and characterization of chemical compounds produced by microorganisms is a crucial step in the development of new drugs, as many pharmaceutical compounds currently in use are derived from bacterial sources. Marine bacteria are prolific producers of fascinating bioactive secondary …
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