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Showing 1 to 20 of 42 for “"sublethal effects"”.
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Sublethal Effects of Pesticides on Visually-Guided Bee Behaviours
… to foragers and nest bees. No interactive effects between age and pesticide exposure were observed. These findings highlight potential impairments in foraging efficiency and navigation, with significant implications for pollination services and pesticide risk assessments.
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Sublethal effects of carbofuran and methidathion on reduviolus americoferus (carayon) (Hemiptera: Nabidae)
The objective was to quantify sublethal effects of two insecticides on the common damsel bug, a major predator in alfalfa. Groups of 2-day-old adult nabids were exposed for 12 h to filter paper treated with LC₅ or LC₄₅ carbofuran, or LC₅ or LC₂₅ methidathion. Males that survived the 4-day acute …
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The sublethal effects of 2,4-D dimethylamine on wood frog tadpoles in Saskatchewan
… two experiments were performed to test the sublethal effects of the herbicide 2,4-dichlorophenoxyacetic acid (2,4-D) on tadpoles of the wood frog (Rana sylvatica). Wood frog tadpoles in the first experiment were exposed to 2,4-D amine at 0.1, 1.0 and 100 ug/L in outdoor microcosms. …
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The lethal and sublethal effects of aldicarb on the estuarine grass shrimp, Palaemonetes pugio
… placed on the quantification of the lethal and sublethal effects of aldicarb on three different life stages of P. pugio. Acute 96-h toxicity tests were conducted with newly hatched larvae, 22-d old larvae and adult grass shrimp to determine lethal toxicant ranges. LC₅₀ values were 85.0 ug/L for …
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Sublethal effects of cadmium and diazinon on reproduction and larval behavior in zebrafish (Brachydanio rerio)
… impacts. Fish are often exposed to lethal and sublethal contaminant concentrations. At sublethal concentrations, there is still a concern that contaminant exposure may influence life history parameters. Sublethal contaminant exposure can impair many reproductive processes, and I was interested …
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Sublethal effects by deltamethrin and spinosad on the grain weevils Sitophilus zeamais and S. granarius
… cause pest mortality, this may stimulate sublethal effects which may lead to harmful or even beneficial responses that may affect (or not) the behavior and sexual fitness of the exposed insects. One ongoing concern with pesticides use is the impact on non-target organisms, particularly …
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Native New Zealand fish: lethal and sublethal effects of pentachlorophenol on early and adult life stages
… exposed to pentachlorophenol, and the acute and sublethal responses were compared to those of the reference species rainbow trout (Oncorhynchus mykiss). Analysis of the acute exposures enabled the determination of 25 LC50 values for the various life stages and fish species examined. In addition, …
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Sublethal effects of an acetylcholinesterase-inhibiting pesticide on fitness-related traits in the western fence lizard (Sceloporous occidentalis)
… fish, exposed to these compounds. However, the effects of AChE-inhibiting pesticides at the whole-organism level, most importantly effects relevant to an individual's fitness, have received less attention. My Master's research focused on describing the effects of carbaryl, an AChE-inhibiting …
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A Comparison of Vegtation Indices and Conventional Ecotoxicological Plant Growth Metrics to Assess the Lethal and Sublethal Effects of Atrazine on Smooth Cordgrass,'Spartina alterniflora'
… tested to date (Solomon et al., 1996) and sublethal plant stress within these species may be important in developing new techniques to assess atrazine stress. This is of particular importance within the coastal zone of the U.S. as there is wide-spread usage of atrazine in both residential …
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Sublethal effects of Bacillus thuringiensis Berliner on the diamondback moth, Plutella xylostella (L.), and its natural enemy, Cotesia plutellae Kurdjumov : implications for resistance management / by Lynne Grbin.
This research examines biological and behavioural interactions among the diamond-back moth, Plutella xylostella L. (Lepidoptera: Plutellidae), Cotesia plutellae Kurdjumov (Hymenoptera: Braconidae) and the microbial insecticide, Bacillus thuringiensis Berliner. A deterministic simulation model is …
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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
… origin, biopesticides can cause lethal and sublethal effects on non-target organisms. During this PhD project, we studied the toxicity of synthetic pesticides and biopesticides on wild and managed bees, using different products marketed in Mediterranean and tropical areas, and some …
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Combining natural enemies and selective pesticides in IPM programmes of exotic pests: the Tuta absoluta (Lepidoptera: Gelechiidae) case
… in their toxicity, both in terms of lethal and sublethal effects, as well as in their persistence after initial application on plants. Among the tested biopesticides only Bacillus thuringiensis proved to be harmless; whereas spinosad, emamectin benzoate and metaflumizone were moderately harmful …
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Influence of entomopathogenic fungi from forest and urban habitats on founding pairs of reticulitermes flavipes (rhinotermitidae)
… this research compared mortality and sublethal effects on founding pairs by exposure to fungal spores from forest and urban habitats. Behavior of founding pairs in the presence of any spores and fungistatic effects of founding pair head and abdomen extracts on spore germination were …
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Effects of an insecticide/fungicide mixture on queen rearing behavior and hypopharyngeal gland morphology in honey bees (Apis mellifera L.) (Hymenoptera: Apidae)
… safe for honey bees, I investigated possible sublethal effects on the nursing behavior and hypopharyngeal gland morphology of one-week-old nurse bees. For one week I fed newly emerged adults pollen treated with pesticides at minimum concentrations that had previously been shown to affect honey …
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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
… the face of widespread declines, the non-target effects of pesticides on ecologically and economically important bees are an area of growing concern. One class of pesticides that has gained considerable attention over the past two decades is the neurotoxic neonicotinoid insecticides. …
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Effects of Phorate on Ducklings, Macroinvertebrates, and Microtox in Northern Prairie Wetlands
The effects of phorate, an organophosphorus insecticide, on mallard (platyrbynchos) ducklings and aquatic macroinvertebrates was studied in littoral mesocosms in South Dakota wetlands. In 1991 and 1992, four mesocosms were constructed in each of three wetlands. In each wetland, one mesocosm was a …
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Unraveling the Vibrational Communication of Halyomorpha halys and the Insecticidal Impact on its Key Parasitoid Trissolcus japonicus: Implications for Integrated Pest Management and Biological Control
… for bioclimatic modeling of climate change effects on H. halys and insights into the use of vibrational playbacks for monitoring and mass trapping as control techniques. The diel pattern of vibrational communication of H. halys was studied in semi-field and laboratory conditions. The …
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Growth Rate and Performance Effects on Watersnakes (Nerodia Sipedon) from Dietary Exposure to Heavy Metals
… known about reptile toxicology and the fitness effects that contaminants may cause. This study examines trace element concentrations, growth rates and performance measures in Northern Watersnakes, Nerodia sipedon when fed fish from a polluted mining-waste site or fish from non-contaminated …
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Sublethal dosage effects of carbaryl on honey bee (Apis mellifera (L.)) colonies
The sublethal dosage effects of carbaryl were studied in honey bee (Apis mellifera L.) colonies. Carbaryl was fed to colonies during a 14-day period in a 0.95 M sucrose solution. Carbaryl dosages were based on 0.0036, 0.0178, and 0.0356 ug/bee/day, and concentrations approximated 0.09, 0.44, and …
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Acute and chronic effects of selenium on Daphnia pulex
… were 12.56 and 27.08 mg/l selenium. The sublethal effects of 0.2, 0.4, 0.6 and 0.8 mg/1 selenium on survival, growth and reproduction of Daphnia pulex were monitored for twenty-eight days. These results were analyzed statistically by brood. Appreciable mortality only occurred at 0.8 mg/l …
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