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 75 for “"agroecosystems"”.
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Tracking Antibiotic Resistance throughout Agroecosystems
… genes (ARGs) to the broader environment. Within agroecosystems, ARGs can pose a risk to livestock handlers, farmers, and ultimately consumers. The overall goals of this dissertation are to examine the presence of resistance (antibiotic, metal) in agricultural soils and evaluate the most critical …
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Evaluation of life cycle assessment methodology for multiple agroecosystems
… to multifunctional woody polyculture (MWP) agroecosystems has been proposed as a potential strategy for mitigating these harmful impacts while still yielding high value crops. Life Cycle Assessment (LCA) has the potential to meaningfully capture these impacts, enabling improved decision …
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Factors influencing phosphorus losses in agroecosystems dominated by tile drainage
Phosphorus is an important macronutrient for crop production but phosphorus surpluses may be conveyed from diffuse sources to streams via surface runoff and artificial subsurface (perforated plastic pipes called tiles) drainage affecting the quality of receiving aquatic ecosystems. However, …
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Biology of Chauliognathus spp. (Hentz) (Coleoptera: Cantharidae) in Virginia agroecosystems
… common species of cantharid beetles observed in agroecosystems in Virginia. Despite their widespread abundance and early recognition and description in the 1700s, little is known about their phenology and ecological role in agricultural systems. Immatures have been recorded feeding upon …
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Arthropod Predation in Brassica Agroecosystems: Effects of Latitude, Community Composition, and Diet Breadth
… services by consuming herbivore prey in agroecosystems. Yet, variation in arthropod predation strength among cropping systems and regions can prevent farmers from taking advantage of this alternative pest management strategy. This research examines underexplored potential causes of …
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Ground-Dwelling Arthropod Community Structure of Saskatchewan's Agroecosystems and Seeded Grasslands
… role in maintaining the health and function of agroecosystems in the Canadian prairie landscape. However, the distribution of many groups is often limited to non-crop habitats, such as roadside ditches or distantly spaced grassland refuges. The high prevalence of prairie pothole wetlands in this …
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Understanding seed-soil adhesion by myxospermous seeds and their biophysical function in agroecosystems
… aboveground composition of plant communities in agroecosystems. Understanding seed fate informs seedbank dynamics with multi-species interactions, as well as safeguarding arable biodiversity and food security. While many seed fate pathways are well known, the role of myxospermy in temperate …
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Ecological legacies from grasslands to agroecosystems : microbial ecology, plant community assembly, and resource allocation
Large scale soil degradation is pervasive across the modern landscape. The expansion of municipal infrastructure and the legacy effects of agriculture play key roles in the continued alteration of the soil profile. The response of the soil physical, chemical, and biological properties along with …
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Ammonia Volatilization, Urea Hydrolysis, and Urease Inhibition with the Application of Granular Urea in Agroecosystems
Synthetic nitrogen (N) fertilizers play a key role in human nutrition and crop production. The most widely used N source globally is urea; however, N loss via ammonia volatilization can be great in agricultural systems where urea is surface-applied. The objectives of the experiments reported in …
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Impact of Manure Land Management Practices on Manure Borne Antibiotic Resistant Elements (AREs) in Agroecosystems
… application integrates livestock farming and agroecosystems. This manure contains antibiotic resistant elements (AREs) (resistant bacteria, resistance genes, and veterinary antibiotics) that contribute towards antimicrobial resistance. Altering manure application techniques can reduce surface …
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Bird and Bat Diversity and Abundance in Agroecosystems in Relation to Drainage Hedgerow and Landscape Structure
… along agricultural drainages in temperate agroecosystems. Two important variables likely to affect diversity within hedgerows include hedgerow structure and landscape structure. I hypothesized that hedgerows that are taller, wider, and more variable in height, and landscapes with smaller …
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Beyond corn as king: Addressing water quality and soil organic carbon decline in maize-based agroecosystems
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-12-01
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Budget and fluxes of nitrogen in mountainous agroecosystems in a summer monsoonal climate under intensive land use
A balanced nitrogen (N) cycle in intensively managed ecosystems is necessary as it underpins other ecosystem services. This study evaluated the agricultural practices in a typical mountainous catchment in South Korea in respect to N dynamics and their potential effect on water quality with the aim …
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Food webs and phenology models: evaluating the efficacy of ecologically based insect pest management in different agroecosystems
Integrated pest management (IPM) is defined as an effective and environmentally sensitive approach to pest management that relies on a combination of common-sense practices. Integrated pest management programs use current, comprehensive information on the life cycles of pests and their interactions …
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Impacts of organic and conventional neurotoxic pesticides on a pest and a pollinator in almond agroecosystems (Prunus dulcis)
… non-target effects on beneficial arthropods in agroecosystems, including pollinators. In this study, focused on the almond production system in California's Central Valley, I examined impacts of the synthetic neonicotinoids and the organic spinosyns on the pest navel orangeworm and the managed …
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The double life of an insect pathogen: Metarhizium as a plant symbiont and its genetic diversity in coffee agroecosystems
The Metarhizium genus is widely recognized for its entomopathogenic capacity, but more recently was recognized as a plant symbiont, being able to transfer nitrogen from insect cadavers to plants, act as plant pathogen antagonist and plant growth promoter. All those functions could be valuable as …
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Re-thinking management approaches in complex agroecosystems: relationships between the fungus Aspergillus flavus and two insects of economic importance
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01
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Toxicity assessment of pesticides and biopesticides on wild and managed bees (Hymenoptera, Apoidea), and richness evaluation in mediterranean and tropical agroecosystems
… commonly used in Italian and Brazilian agroecosystems, including greenhouses, were evaluated, with particular attention to some biopesticides of botanical origin, such as EOs. Synthetic and botanical pesticides caused lethal and sublethal effects on social (honeybees, bumblebees, …
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Diversity and Abundance of Bees in Canadian Prairie Agroecosystems: Understanding the Role of Remnant and Restored Habitat in Supporting Native Bee Populations
Habitat loss due to agricultural intensification has negative implications for native bee communities throughout Western Canada. Wetland remnants are a common feature within the Prairie Pothole Region of Saskatchewan and are threatened due to continued conversion to agricultural land. Approximately …
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