Index Catalog // ScholarsArchive@OSU

A Multi-Tiered Approach Using Daphnia magna to Assess Chlorpyrifos Risk to Aquatic Receptors

Creator:: Maggio, Stephanie A.
Abstract:: Chlorpyrifos (CPF) is a widely used broad-spectrum organophosphate insecticide. Following exposures, CPF and its more toxic oxon metabolite (CPFO) elicit neurotoxic effects by inhibiting the activity of the acetylcholinesterase enzyme (AChE), resulting in altered fitness and death at high doses. Following exposure, organisms bioactivate CPF to CPFO through the Cytochrome...
Resource Type:: Dissertation
Full Text:: Jeffrey J. Jenkins Chlorpyrifos (CPF) is a widely used broad-spectrum organophosphate insecticide

Continuous monitoring and modeling to assess pesticide exposure in critical habitat for Pacific salmonids

Creator:: Janney, Philip K.
Abstract:: Pacific Northwest and California freshwater resources are key elements in the life history and ecology of Pacific salmon and steelhead listed as threatened or endangered under the Endangered Species Act. Risk to listed Pacific salmonid species can be assessed by evaluating the spatial and temporal co-occurrence of salmonid species at...
Resource Type:: Dissertation
Full Text:: . Abstract approved: ______________________________________________________ Jeffrey J. Jenkins

Chemical and environmental factors affecting pesticide volatilization from turfgrass

Creator:: Conway, Michael S.
Abstract:: Volatile loss rates of pesticides from turfgrass were measured using the Backward-Time Lagrangian Stochastic Dispersion model (Flesch et al., 1995). Solar radiation, ambient temperature, surface temperature, relative humidity, wind direction, and wind speed were monitored continuously. Growth regulator was applied to the turf plot several days before pesticide application to...
Resource Type:: Masters Thesis
Full Text:: FACTORS AFFECTING PESTICIDE VOLATILIZATION FROM TURFGRASS. Abstract approved Jeffrey J. Jenkins

Biochemical and physiological indicators of behavioral impairment in salmonids exposed to chlorpyrifos and copper

Creator:: Sandahl, Jason
Abstract:: The purpose of this work was to determine if environmentally-relevant concentrations of chlorpyrifos and copper, two commonly detected chemicals in Western surface waters, can negatively impact the biological health of salmonids. Both compounds are highly neurotoxic to fish, but each with distinct biological target sites and mechanisms of action. We...
Resource Type:: Dissertation
Full Text:: Concentration Estimates for Acetyicholinesterase Inhibition. Jason F. Sandahi and Jeffrey J. Jenkins Oregon

Environmental estrogens and skeletal development disruption in the fathead minnow : A teleost model of vertebrate developmental toxicity

Creator:: Warner, Kara E.
Abstract:: Natural and synthetic estrogenic compounds detected in surface waters have been linked to endocrine signaling disruption in several species. Endogenous estrogen contributes to cartilage and bone deposition during development in vertebrates, and is susceptible to perturbation from xenoestrogens. The goals of this work were to develop a teleost model to...
Resource Type:: Dissertation

Whole system perspective : Steelhead, Onchorhynchus mykiss, glutathione s-transferase as a biomarker of chlorpyrifos exposure

Creator:: Pecore, Rachael G.
Abstract:: Organophosphate insecticides may produce sublethal, adverse effects on salmonid growth, reproduction, maturation, swimming, and feeding. Chlorpyrifos, an organophosphate insecticide, was detected by the Oregon Department of Environmental Quality in the Hood River and tributaries during March 1999 at levels exceeding state water quality standards in the range of 0.011-0.482 μg/L....
Resource Type:: Undergraduate Thesis

Susceptibility of riparian soil invertebrates to the herbicide triclopyr

Creator:: Moran, Patrick (Patrick William)
Abstract:: Riparian zones of Pacific Northwest forests have high species diversity and abundance and act as an important interface between the aquatic and terrestrial ecosystems. In addition, riparian zones comprise a significant portion of the total buffer zone established during commercial forest production to protect aquatic ecosystems from adjacent management activities....
Resource Type:: Masters Thesis

Respiratory strategies and associated exchange epithelia as determinants on contaminant uptake in aquatic insects

Creator:: Buchwalter, David B.
Abstract:: Aquatic insects are used extensively to evaluate water quality. Despite their widespread use as indicator organisms, relatively little is known about the organismal characteristics that determine sensitivity differences to individual and multiple stressors. Insects have evolved several respiratory strategies that range from breathing atmospheric air to utilizing dissolved oxygen in...
Resource Type:: Dissertation
Full Text:: . Jeffrey J. Jenkins. In addition, Chapter four was co-authored by Jason Sandahi. TABLE OF CONTENTS

Effects of esfenvalerate on native macroinvertebrates representative of Pacific Northwest streams

Creator:: Johnson, Katherine R.
Abstract:: Aquatic insects are essential components of healthy stream ecosystems, contributing to nutrient cycling, trophic dynamics and other ecological functions. Aquatic insect species, particularly those in the orders Ephemeroptera, Plecoptera and Trichoptera (EPT taxa) are however, extremely sensitive to insecticide contamination. Given that urban and agricultural use of synthetic pyrethroid insecticides...
Resource Type:: Dissertation
Full Text:: : _____________________________________________________________________ Paul C. Jepson Jeffrey J. Jenkins Aquatic insects are essential components of

Incorporation of aerodynamic and boundary layer resistances in determining initial evaporation rates of pesticides from turf grass

Creator:: Conway, Michael
Abstract:: Evaporative loss rates of pesticides, following application to turfgrass, were measured using the Backward-Time Lagrangian stochastic Dispersion model (Flesch, Wilson, Journal of Applied Meteorology, 34, pp. 1320-1332. All pesticides were applied to a 22.8 m x 22.8 m orchard ryegrass turf plot near Corvallis, Oregon. Solar radiation, ambient temperature, surface...
Resource Type:: Undergraduate Thesis

ScholarsArchive@OSU

A Multi-Tiered Approach Using Daphnia magna to Assess Chlorpyrifos Risk to Aquatic Receptors

Continuous monitoring and modeling to assess pesticide exposure in critical habitat for Pacific salmonids

Chemical and environmental factors affecting pesticide volatilization from turfgrass

Biochemical and physiological indicators of behavioral impairment in salmonids exposed to chlorpyrifos and copper

Environmental estrogens and skeletal development disruption in the fathead minnow : A teleost model of vertebrate developmental toxicity

Whole system perspective : Steelhead, Onchorhynchus mykiss, glutathione s-transferase as a biomarker of chlorpyrifos exposure

Susceptibility of riparian soil invertebrates to the herbicide triclopyr

Respiratory strategies and associated exchange epithelia as determinants on contaminant uptake in aquatic insects

Effects of esfenvalerate on native macroinvertebrates representative of Pacific Northwest streams

Incorporation of aerodynamic and boundary layer resistances in determining initial evaporation rates of pesticides from turf grass

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