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 19 of 19 for “"semiochemicals"”.
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Influence of synthetic mustelid semiochemicals on population dynamics of the deer mouse
In this study I investigated population changes in the deermouse (Peromyscus maniculatus) in the southwestern part of the Morice Forest District of the Prince Rupert Forest Region of British Columbia. I tested the hypothesis that synthetic weasel odours would adversely affect deer mouse population …
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Responses of Sitotroga cerealella to semiochemicals and physical characteristics of corn kernels
Características físicas e químicas da planta têm relação interespecífica com insetos, as quais podem ser utilizadas no Manejo Integrado de Pragas. Objetivou-se neste trabalho: i) Avaliar a resistência de cinco genótipos de milho (Zea mays) (UFVM100, UFVM200, UFVM100X200, AG1051 e DKB747) sobre S. …
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Use of solid-phase microextraction to detect semiochemicals in synthetic and biological samples
… microextraction (SPME) at identifying semiochemicals (chemical messengers) in both synthetic and biological samples. Solid-phase microextraction, an alternative to traditional sample fractionation, employs specialized polymer fibers to detect molecules in a sample’s headspace. …
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Southern pine beetle, Dendroctonus frontalis Zimmermann (Coleoptera: Scolytidae): quantitative analysis of chiral semiochemicals
Semiochemicals released from logs infested by southern pine beetle (SPB), <i>Dendroctonus frontalis</i>, from a total of eight infestations located in Texas, South Carolina, and Virginia were collected four to eight days after initial attack. The quantities and chiralities of most semiochemicals, …
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Factors affecting the response of thrips to an olfactory cue
… use to find their hosts, including the use of semiochemicals as attractants in pest management. However, our understanding of the mechanisms eliciting the response of thrips to semiochemicals is still only rudimentary and a greater understanding of their behavioural response to olfactory cues …
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Exploring Chemically Mediated Interactions Between Spotted Lanternfly, Lycorma delicatula, and Its Host Plants in the Mid-Atlantic Region of the United States
… for chemical defense. Yet how volatile semiochemicals and sequestration dynamics shape behavior and inform management remains unresolved. This dissertation integrates behavioral ecology, analytical chemistry, and transcriptomics to connect mechanisms with management. Chapter I reviews …
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Mise en place de différentes stratégies visant à favoriser l’approche « push-pull » pour le contrôle des pucerons en cultures maraîchères dans l’est de la Chine
… in courgettes and potato fields. We used three semiochemicals, the (E)-β-farnésène, the (Z)-3-Hexenyl acetate and a garlic extract and intercropping with pea. The effect of these treatments in the populations of aphidiphagous beneficial insects was determined by five weeks of insect trapping and …
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Phasgonophora sulcata Westwood (Hymenoptera: Chalcididae): A Potential Augmentative Biological Control Agent For The Invasive Agrilus planipennis Fairmaire (Coleoptera: Buprestidae) in Canada
… adult-produced pheromones; (3) identification of semiochemicals used in host searching; and (4) observations on the within-tree and temporal distributions of P. sulcata and other parasitoids in A. planipennis-infested sites in Southwestern Ontario. My results indicate that P. sulcata possesses …
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Developing novel tools to explore the marine volatilome
… been extensively studied for their importance as semiochemicals and in climate regulation. In contrast, disentangling the myriad of signature VOCs in gas chromatographicdata has received much less attention. This thesis aims to develop novel analytical tools that utilise chromatographic …
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Investigations into the oviposition behaviour of the mosquito Anopheles gambiae
… This project investigated potential oviposition semiochemicals and the oviposition behaviour of An. Gambiae sensu stricto Giles. The volatile profiles of seven bacteria were analysed by gas-chromatography linked mass-spectroscopy (GC-MS) to determine their volatile profiles and behavioural assays …
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Functional characterization of olfactory receptors and molecular species identification of vector mosquitoes.
… and gustatory receptors (Grs). Detection of semiochemicals via olfactory receptors modulates behaviors including nectar seeking, host seeking, oviposition site selection, mate selection, and resting place selection, all of which have direct impacts on vector fitness. The discovery of …
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La comunicazione chimica in Blattaria: contributo al miglioramento della lotta
… responses of Italian sinanthropic cockroaches to semiochemicals and food attractants, for the purpose of evaluating a possible practical application and of contributing to the improvement of control techniques. Behavioral and morphological studies have been carried out on Supella longipalpa (F.), …
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Host plant associations and chemical ecology of Cerambycidae
… the 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. …
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The role of host cues in the transmission of sleeping sickness
… for G. f. fuscipes, suggesting that unidentified semiochemicals are present in lizard odour. For G. f. fuscipes, the response of female flies increased from 18% to 24% with lizard odour, but mammalian odours did not have any affect. For G. tachinoides the landing response increased significantly …
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Mosquito odor receptor gene targets to alter vector host choice
… hosts for a blood meal. Mosquitoes detect semiochemicals through odorant receptors, each of which interact with specific odorants. Differences in feeding behaviors have significant consequences for the vectorial capacity of Anopheles mosquitoes. Mosquitoes in the genus Anopheles vector the …
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Pheromones, nectar, and computer vision: investigating large-scale patterns of chemodiversity.
… be less rich in biodiverse regions and contact semiochemicals more rich, using a large scale meta-analysis approach, I show that insect semiochemistry broadly follows the patterns expected under information theory. These results suggest that large scale patterns of chemodiversity may arise due …
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Response of Stomoxys calcitrans and Musca domestica (Diptera: Muscidae) to Volatile Organic Compound Profiles from Ontario, Canada Dairy Farms
Stomoxys calcitrans are significant pests of dairy and beef cattle livestock facilities. Their seasonal abundance causes damage to the industry in the United States. While similar damage has been documented in Canada, the majority of the research explores population dynamics of stable flies with …
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Aggregation, dispersal and edge behavior of the bark beetle predator Thanasimus dubius (Coleoptera: Cleridae); potential use in biological control
… which allowed the testing of a wider range of semiochemicals (frontalin, ipsenol, ipsdienol, sulcatol, and α-pinene). A final wind tunnel experiment tested the ability of naive predators to learn two prey pheromones, frontalin and ipsenol, that were presented alone or associated with a reward. …