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 32 for “"neonicotinoids"”.
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The effect of neonicotinoids on Apis mellifera: A revisit
… not find any evidence for a harmful effect from neonicotinoids (NNIs). There was weak evidence that NNI exposure was associated with lower colony mortality in UK sites. ii</p>
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Measuring the exposure of Songbird Nestlings to Neonicotinoids in Natural and Agricultural Nest Sites
Neonicotinoid insecticides such as imidacloprid (IMI) have been under scrutiny for their damage on non-target invertebrates. However, recent literature suggests that grassland birds are experiencing population declines concurrently with increased IMI use. Field research was conducted to test the …
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Effects of neonicotinoids and fungicides on soil invertebrate communities and litter decomposition within restored prairie
… and emerging evidence suggests that both neonicotinoids and fungicides can greatly impact the health of soil invertebrate communities. My study compares soil fauna community composition, abundance, species diversity, and litter decomposition across restored prairie plots treated with a …
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Quantification of neonicotinoid residues in soils and dust drift in conservation reserve program fields in Illinois, USA
Neonicotinoids, a new class of systematic insecticides, are commonly used as seed coat treatment for crop protection. In the United States, neonicotinoid-treated seeds are planted on most corn acres and over half of the soybean acres. Neonicotinoids are also registered to use on other major field …
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Impacts of organic and conventional neurotoxic pesticides on a pest and a pollinator in almond agroecosystems (Prunus dulcis)
… contrast with conventional pesticides, such as neonicotinoids, synthesized based on natural products. Both spinosyn and neonicotinoid insecticides act on binding sites of the nicotinic acetylcholine receptors. Although used against specific target pests, both spinosyns and neonicotinoids are …
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Spatiotemporal Patterns of Distribution and Drivers of Neonicotinoid Insecticide Fate in Canadian Prairie Pothole Wetlands
… for the protection of major agricultural crops, neonicotinoids are the fastest-growing class of insecticides used against a broad spectrum of insect pests. Although neonicotinoid toxicity toward non-target organisms (e.g., bees, aquatic insects) has been well-studied, less is known about their …
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Assessing the Effects of Chronic Neonicotinoid Insecticide Exposure on Aquatic Insects using Multiple Experimental Approaches
… of toxicological data evaluating the effects of neonicotinoids restricts the ability of regulators to adequately protect sensitive insects particularly those with aquatic larval stages. Many Prairie wetlands are in regions of intensive agriculture and are directly at risk of neonicotinoid …
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Evaluation of native bee nesting rates and beetle community assemblages in the presence of clothianidin in the soil of natural areas
The neurotoxic insecticide class of neonicotinoids has become one of the most widely used groups of insecticides in recent years. They exhibit long half-lives and have the potential to linger in the environment and affect arthropod communities long after application. Many studies have looked at the …
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Environmental Fate of Animal Manure-associated Antibiotics and Seed-coated Pesticide in Soils
… and determine the ability of second-generation neonicotinoids to move through soil when applied as a seed coating using a greenhouse study. Liquid-solid extraction of PLY from soil using (1:6, v/v) ammonium hydroxide/methylene chloride produced good PLY recovery (67-140%). Liquid-chromatography …
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The effect of dietary neonicotinoid supplementation on innate and adaptive immune responses to porcine reproductive and respiratory syndrome virus
Neonicotinoids are currently the most widely used insecticides in the world to treat crops and seeds in the commercial agricultural industry. Acting as nicotine analogues neonicotinoids signal to α-bungarotoxin (α-BT) sensitive insect nicotinic acetylcholine receptors (nAChR), which are expressed …
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Analysis of Strobilurin Fungicides, Neonicotinoid Insecticides and Degradation Products in Atmospheric Particles
… exhibited matrix effects were for metabolites of neonicotinoids, while strobilurin fungicides showed soft to moderate matrix effects in >75% of samples. Neonicotinoids that were detected included imidacloprid, clothianidin, acetamiprid, and thiamethoxam. The highest detection frequency in 2016 was …
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The Characterisation Of Bee Nicotinic Acetylcholine Receptors
The effects of insecticides such as neonicotinoids on beneficial insect species such as pollinators has become a matter of considerable interest. Localised bee colony losses and losses of wild bee numbers are believed to be related to the use of these insecticides, resulting in a European ban on …
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Assessing Potential Solutions to Mitigate Pollution from Neonicotinoid Seed Coatings
Thiamethoxam and clothianidin are two neonicotinoids used in seed coatings for crops such as corn and soybeans. Both neonicotinoids have high solubility in water, so they are prone to transport via leaching and runoff. This thesis is comprised of two studies that evaluated potential solutions to …
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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 targets of effective insecticides, including neonicotinoids and spinosad. The heterologous expression of nAChRs, in Xenopus laevis oocytes, has enabled the study of functional and pharmacological properties of these receptors by two-electrode voltage clamp electrophysiology. Myzus persicae, …
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The effects of environmental factors on honey bee morbidity
… bees are most likely to come in contact with neonicotinoids; when treated crops are planted and when they bloom. I build on a previous study by adding multiple years of apiary sample data and by using additional control variables including weather and forage availability. In addition, I …
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Evaluating Agricultural Best Management Practices to Mitigate Neonicotinoid Transport in Water and Soil
… it is important to quantify the movement of neonicotinoids from agricultural fields and examine how conventional agricultural practices can be altered using best management practices to minimize neonicotinoid transport. We developed a proportional runoff sampler that is inexpensive, rugged, …
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Sublethal Effects of Pesticides on Visually-Guided Bee Behaviours
… behaviours. Previous studies showed that neonicotinoids and sulfoxaflor impaired flight performance and walking tracks associated with optomotor responses in workers. This study is investigating the responses of different honeybee castes and worker age groups to optomotor stimuli in a 360° …
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Chronic contact exposure to realistic soil concentrations of a neonicotinoid insecticide represents a potentially important and unexplored route of exposure for ground nesting bees
… is the neurotoxic neonicotinoid insecticides. Neonicotinoids are a widely used group of compounds that are often applied preemptively to protect plants from pestiferous insects. Due to their systemic nature, they are found throughout treated plants, including in pollen and nectar. This has led …
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Spread of Red Imported Fire Ant, Solenopsis invicta, in Virginia and effects of sub-lethal exposure to agrochemicals on its behavior
… exposure. We found detectable levels of neonicotinoids in the soil of the ant mounds as well as in the ants themselves. In addition, we investigated the effects of dietary exposure to imidacloprid on foraging behavior in a laboratory setting. We found that unexposed colonies were able to …
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Economic Aspects of Crop Pest Management and Monarch Conservation
… cost effective, such treatments which include neonicotinoids and herbicide tolerant (HT) crops contaminate soil and water and cause wildlife habitat loss. In my thesis, I explore the economics of eco-friendly practices of the farmers ranging from bio-diversity conservation to adapting …
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