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 34 for “"pest species"”.
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The structure of global invasive assemblages and their relationship to regional habitat variables: converting scientifically relevant data into decision relevant information
Quantitative methods for pest risk assessment combine sound statistical tools with sound ecological theory to convert scientifically relevant data into decision-relevant information. This thesis investigated a quantitative method for pest risk assessment called pest profile analysis (PPA). PPA is a …
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Valuing the ecosystem services provided by UK bats under climate change
… as important regulators of agricultural pests populations, yet the ecological mechanisms linking bat biodiversity to potential pest suppression, and the economic value of this service, remain poorly understood. This thesis investigates how climate change may affect bat communities, their …
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BUILDING FRAMEWORKS FOR UNDERSTANDING INVASIONS AND EXTINCTIONS FOR BIODIVERSITY SCIENCE
… spread of pathogens, and invasion by exotic species. Biodiversity change and especially loss can alter ecological assemblages irreversibly, which consequently can change the direction and magnitude of key ecosystem functions that organisms, including humans, rely on. Therefore, it is …
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Population biology and ecology and of Periplaneta americana (L.) in the urban environment
… americana (L.), is an important urban pest due to its ability to invade residential and commercial structures from non-residential reservoirs. Extensive field studies were conducted in a large urban apartment complex, Lincoln Terrace (LT), managed by the Roanoke Redevelopment and …
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Advances in tortricid systematics and identification (Lepidoptera: Tortricidae)
… microlepidoptera, consisting of more than 10,300 species in 1,070 genera. Many tortricids are considered to be economically important, and the family contains the highest percentage of pest species in the Lepidoptera. This dissertation provides significant advances in tortricid systematics and …
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Symbionts and immune defence in lepidopteran crop pests
… losses across worldwide agriculture. These pest species are constantly being dispersed and generate great concern due their resistance against chemical pesticides and Bt crops. These factors emphasize the importance to the development of technologies for rapid field diagnosis and specific …
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Spiders associated with apple trees in Virginia with notes on their importance in controlling orchard insect pests
The species complex and population dynamics of spiders were studied in an abandoned and several commercial apple orchards in Virginia. There were 68 and 45 species found in the abandoned and combined commercial orchards respectively. Species numbers in individual commercial orchards ranged from …
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Spatiotemporal Composition of Pest Ant Species in the Residential Environments of Santa Isabel, Puerto Rico
… studies have evaluated the community dynamics of pest ant species in tropical urban environments. Pest ant community dynamics were examined within three Puerto Rican housing developments. Housing developments (one, four, and eight years old), representing different stages of urban succession were …
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Measuring juvenile hormone and ecdysteroid titers in insect haemolymph simultaneously by LC-MS: The basis for determining the effectiveness of plant-derived alkaloids as insect growth regulators
… affecting haemolymph hormone titers in putative pest species. Juvenile hormones (JHs), JH diols and ecdysteroids were easily separated by high performance-liquid chromatography (HPLC) in less than 20 min using a reversed-phase C18 column and a methanol-water gradient. Subjecting the JH-JHBP …
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Molecular evolution of a superfamily of chemoreceptors in Musca domestica and Ceratitis capitata
… fruit fly (Ceratitis capitata) are two important pest species. While both are generalists, the first is a major vector of a variety of human and livestock disease, while the second is a broadly polyphagous herbivore and important crop pest. Each must be able to navigate a complex set of chemical …
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The structure and function of Gene's organ and its associated glands in ticks
… on tick reproduction of use in designing new pest control methods. This is the first study to describe the structure of Gene's organ, the egg-waxing organ in ticks, using electron microscopy. Both ultrastructural and physiological aspects are investigated in two important pest species, …
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Dichlorodiphenyltricholorethane (DDT) resistance mechanisms in Drosophila melanogaster and applications for the cowpea pest Clavigralla tomentosicollis
… to resistance in both medical and agricultural pests as well as health and environmental concerns, and improved insect pest management (IPM) programs are necessary. The arrival of next-generation sequencing (NGS) and lowered sequencing costs provides the tools for elucidating how insects evolve …
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The vascular flora of Prentice Cooper State Forest and Wildlife Management Area, Tennessee
… comprised of 139 families, 512 genera, and 1,038 species and lesser taxa. The four largest families are Asteraceae (128 species-12% of the flora), Poaceae (106 species-10%), Cyperaceae (64 species-6%), and Fabaceae (57 species-5%). These four families represent approximately 34% of the total …
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Encounters in the forest: Social and ecological dimensions of lemur hunting, habitat change and biodiversity conservation in south-east Madagascar
To conserve endangered species in anthropogenic landscapes it is crucial to understand how humans and wild animals perceive each other and the nature of their interactions. In this study I use a cross-disciplinary approach to investigate human-wildlife relationships in Tsitongambarika Nouvelle Aire …
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Thermal biology and establishment potential of two non-native candidate biological control agents, Nesidiocoris tenuis Reuter (Hemiptera: Miridae) and Lysiphlebus testaceipes (Cresson) (Hymenoptera: Braconidae, Aphidiinae), in the U.K.
… the management of agricultural and horticultural pests in southern Europe. Through a series of laboratory and field assessments, this study investigates the establishment potential of these two species in cool temperate climates typical of northern Europe. Laboratory results demonstrated a low …
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The Influence of Thermal and Physical Characteristics of Buildings on Overwintering Brown Marmorated Stink Bugs (Halyomorpha halys)
… impacts on accessibility and suitability for pest species. The brown marmorated stink bug, Halyomorpha halys (Stål), causes household nuisance pest problems because of its habit of using human homes as winter refuges. Studies were conducted to understand behaviors and characteristics relevant …
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Functional characterisation of aphid, Myzus persicae, nicotinic acetylcholine receptors and identification of a novel biogenic amine-gated ion channel from the honeybee, Apis mellifera
… the peach potato aphid, is a major global pest of multiple crop species. The nAChR subunits and several protein chaperones from Myzus persicae have been cloned. It was difficult to achieve robust and frequent expression of a nAChR consisting entirely of subunits from Myzus persicae with the …
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The influence of an umbelliferous understory on the parasites of organic apple orchards in Canterbury
… examined. The indirect influences on the major pest species, codling moth (Cydia pomonella L.) and lightbrown apple moth (Epiphyas postvittana (Walker)) were also investigated. Sampling was carried out in the Lincoln University Biological Husbandry Unit, Canterbury, New Zealand, from November …
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Floral derived compounds as attractants for agricultural pests in the family Noctuidae
Many species of moths within the family Noctuidae are significant agricultural pests. Specific floral volatiles are attractive to both male and female Noctuidae and may be used to as attractants in crop protection. For the first time the following research compares two types of floral volatile …
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LOCAL AND LANDSCAPE DRIVERS OF BIOLOGICAL PEST CONTROL IN AGRICULTURAL SYSTEMS
Biological insect pest control by natural enemies is an important component of sustainable crop production. To capitalize on the potential benefits of biological control, however, we need a clear understanding of the factors underpinning the biological and ecological relationships between pests and …
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