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 “"host preference"”.
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Host preference of Perkinsus species: epizootiological, environmental, and molecular aspects
… In vitro experiments by others suggest a preference of P. marinus for the eastern oyster Crassostrea virginica. Studies conducted in this dissertation on the distribution of Perkinsus species in C. virginica and M. mercenaria from Virginia to Maine using PCR-based detection assays provided …
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Vertical activity, host preference, and population studies of adult Culicoides (Diptera: Ceratopogonidae)
… used to investigate the vertical activities and host preferences of Culicoides species in a forest in Giles County, Virginia. Using ropes and pulleys, rabbit and turkey-baited traps were positioned at ground level, 25, and 50 feet elevation in a forest tree so as to give Culicoides choices of …
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Composition, spatial abundance, co-occurrence and host preference of mistletoes in the Central highland savanna of Namibia
… composition, spatial abundance within hosts, co-occurrence and host preference of mistletoes in the central highland savannas. The study site was divided into four sampling areas based on the presence of the distribution records of the species. Forty circular plots were demarcated and …
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Euonymus scale, Unaspis euonymi (Comstock): host preference, and distribution of native and imported natural enemies in Virginia
Studies were conducted in 1992 and 1993 to determine which of six Euonymus species and cultivars would sustain the highest populations of Unaspis euonymi (Comstock), as a food source for Chilocorus kuwanae (Silvestri). Analysis of data collected from field-grown plants and container-grown plants …
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Seasonal abundance and host preference of Culicoides in Virginia: with emphasis on the ecology of Culicoides variipennis (Diptera: Ceratopogonidae)
… species collected in both traps. Eight new host records were reported in this study. The drop trap collected more midges than did the vacuum trap, and the cattle trap collected more midges than did the sheep trap. Culicoides stellifer began host-seeking activity at SS-30 in bait traps and …
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The Behaviour and Ecology of Mosquito Vectors
… Other aspects: such as oviposition site preference, oviposition rate, hatch rate, and immature morphology were also documented. The second species studied, was Culex pipiens Linnaeus, which is known to be a competent vector of West Nile virus (WNV). Cx. pipiens is considered ornithophilic …
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Bionomics of Culicoides (Diptera:Ceratopogonidae) in Virginia
… attempts with Culicoides guttipennis (Coq.), host preference studies and adult activity studies. Breeding sites of 22 species of Culicoides were located and briefly described. Samples of mud, debris, etc. from suspected breeding sites were brought into the laboratory and maintained at 70°F in …
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Studies on Host-Seeking Behavior and Differential Chemosensory Gene Expression in Above- and Below-ground Culex Pipiens
… avian-seeking, while the fifth showed no clear preference. All three belowground populations predominately sought the human host. Genetic ancestry was not correlated with host preference. Chemosensation drives host-seeking behaviors in female mosquitoes, which led me to quantify the expression …
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Preference and Performance of the Water Lily Aphid (Rhopalosiphum Nymphaeae) among Native and Invasive Duckweeds (Lemnaceae)
… species of insect that feed on a variety of host plants including members of the Lemnaceae family. Many studies have focused on the relationship between herbivore preference and performance on different host plants, and as such the goal of this study was to determine if there is any …
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Exploring Mosquito Thermal Biology and Chemical Ecology in the Context of Host-Seeking and Climate Change
… 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 temperatures and regions of origin on the thermal performance, …
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Variations in Time-Dependent Mosquito-Host Interactions Across Aedes Species
… circadian clocks like their vision, olfaction, host-seeking, mating, oviposition, metabolism, locomotion, and more. However, how the circadian clock regulates mosquito-host interactions and adapts to specific environmental conditions remains largely unknown, despite its importance to vector …
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Evaluation of hybridization among three Laricobius species, predators of hemlock woolly adelgid, (Adelgidae)
… similar to that of L. rubidus. Hybrids showed no host preference in the lab, but a preference for Adelges tsugae in the field. Of 12 site factors examined, only the number of years that L. nigrinus was present at the site was found to be associated with percent hybrids. Contamination of the L. …
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Factors Influencing Ectoparasitism on Western Fence Lizards (Sceloporus occidentalis): Host Sex, Testosterone, Reproductive Condition, and Behavior
<p>Host-parasite relationships are one of the most common symbiotic relationships present in a diverse array of ecosystems. There are numerous factors that impact the dynamics of these relationships. Major factors that can influence the degree of parasitism include host sex, hormonal state, …
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Comparative Genome Analysis of Three Brucella spp. and a Data Model for Automated Multiple Genome Comparison
… species with different virulence patterns and host preferences enabled investigation of the genomic basis of virulence. In the B. suis genome, seventy-one differentiating genes were found, including a contiguous 17.6 kb region unique to the species. Although only one unique species-specific …
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The significance of strain diversity in the epidemiology of Camplobacter jejuni gastrointestinal infections
… have a global distribution and appears to have a host preference for cattle. In addition this strain was responsible for at least four milkborne outbreaks of (Ljejuni enteritis. Data from this study indicates that this strain may be responsible for up to 5 % of sporadic cases of human enteritis in …
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Ecology and Molecular Phylogenetics of <i>Hydnora</i> (Hydnoraceae) in Southern Africa
… biology, germination ecology, parasite-host nutritional relationships, and the molecular systematics of this group. Experimental addition of the primary pollinator, <em>Dermestes maculatus</em> to <em>Hydnora africana</em> chamber flowers demonstrated beetle imprisonment during the …
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Evolution of a Novel Neuronal Sex-Specifically Spliced Gene in Mosquitoes
… many species require a blood meal from an animal host as a protein source for egg development and successful reproduction. The majority of mosquito species are generalists in their host preference, feeding on a range of animals including mammals, birds, and amphibians. However, a small fraction of …
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Mosquito odor receptor gene targets to alter vector host choice
… foraging for nectar and identifying potential 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. …
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Nutzung molekularer Hochdurchsatz-Verfahren zur schnellen und eingehenden Artenbestimmung von Pilzgesellschaften
Zahlreiche Umweltfaktoren beeinflussen den Artenreichtum und die zusammensetzung von Pilzgesellschaften in Waldökosystemen. Einer der wichtigsten Faktoren ist die Pflanze, da ein hoher Prozentsatz der pflanzlich produzierten Kohlenstoffe im Boden wiedergefunden wird. Pilzgesellschaften konnten …
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Biodiversity of phytoparasitic nematodes associated with Musaceae and fruit crops in Colombia
… species are polyphagous, but differences in host preference occur among the species. Type host for Pratylenchus n. sp. is Musa ABB (plantain, hartón cultivar), a host also reported for P. coffeae. So far, P. jaehni and P. loosi have not yet been recorded on Musa plants. Morphological data of …