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 22 for “"sub-lethal effects"”.
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Acute Toxicity and Sub-Lethal Effects of Non-Point Source Pollutants on Invertebrates
… dissertation examines the acute toxicity and sub-lethal effects of diuron, CuPT, B(a)P, and styrene in the mud snail, Ilyanassa obsoleta, the American oyster, Crassostrea virginica, the sea urchin, Lytechinus variegatus, and/or the barnacle, Amphibalanus (= Balanus) amphitrite. In addition, …
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Sub-Lethal Effects of Hypoxia/Hypercapnia on Callinectes Sapidus in the York River Estuary, Virginia
This research examined effects of hypoxic environments on blue crabs, Callinectes sapidus in an estuarine environment. Hypoxic conditions were treated as a multiple stressor involving low dissolved oxygen (D.O.), increased carbon dioxide (hypercapnia), and low pH concurrently. The objectives were …
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Application of attenuated total reflection Fourier transform infrared (ATR-FTIR) spectroscopy to measure sub-lethal effects of potential mutagens
… relatively non-destructive, and so samples can subsequently be analyzed by more conventional approaches. Analyses can be carried out ex vivo or in situ in living tissue, where a reference range of a designated normal state can be derived, and anything lying outside this range is potentially …
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Sub-lethal and lethal effects of a neonicotinoid pesticide on the development of Northern leopard frog tadpoles.
… but few studies have considered its potential effects on anurans. I conducted a static-renewal experiment to monitor the lethal and sub-lethal, developmental effects in Northern leopard frog tadpoles exposed to three concentration levels (250 ng/L, 8.5 mg/L, and 85 mg/L) of imidacloprid in a …
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Use of non-lethal endpoints to establish water quality requirements and optima of the Topeka Shiner (notropis topeka)
… water quality assessments are primarily based on lethal level experiments (e.g. LC50 tests), which are poorly suited for assessing optimal water quality conditions or sub-lethal effects of common stressors. Measurements below threshold values may still impede organismal growth and development, …
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The aquatic macrophyte Vallisneria americana as a biomonitor of site quality in Great Lakes areas of concern.
… a simple and inexpensive, relative measure of sub-lethal effects of organochlorine contamination. The present study was conducted to determine whether this index of surface area could be used as an effective biomonitor of overall site quality in stressed aquatic ecosystems. The leaf-to-root …
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The city blues of an iridescent canary: physiological, behavioral, and developmental impacts of lead (Pb) on songbirds along an urban-to-rural gradient
… lead use was more common. Currently, the sub-lethal effects of lead on wildlife are not well understood, though lead is known to affect physiology and behavior in humans. In response to higher concentrations of lead, animals may have to make trade-offs in order to survive within urbanized …
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Efficacy of Entomopathogenic Nematodes and Entomopathogenic Fungi against Masked Chafer White Grubs, Cyclocephala spp. (Coleoptera: Scarabaeidae)
… providing extended control of white grubs in the subsequent generation. In addition, the sub-lethal effects of EPF on southern masked chafer, C. lurida, were investigated. Neither M. anisopliae nor B. bassiana had a sub-lethal effect on grub weight gain, adult longevity, oviposition, pupation and …
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The Effects of Insecticides on Squash Bug, its Egg Parasitoids and Pollinators in Virginia Cucurbit Production
My dissertation and research focused on the effects of insecticides on squash bugs, its egg parasitoid, and pollinators in the production of cucurbits in Virginia. Plants in the cucumber family are dependent on insect pollination for successful fruit set, and are also susceptible to plant eating …
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Biochemical effects of organophosphorous compounds on cultured rat and human cardiomyocyte-like cells
… The present study aimed to investigate the effects of phenyl saligenin phosphate (PSP), two organophosphorothioate insecticides (diazinon and chlorpyrifos), and their acutely toxic metabolites (diazoxon and chlorpyrifos oxon) on rat H9c2 and human cardiomyocyte-like cells. The rat embryonic …
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Development of an embryo-larval chronic toxicity test using the sea urchins Tripneustes gratilla and Echinometra mathaei
Toxicity tests use organisms to assess the effects of the bioavailable fraction of toxicants in effluents and environmental media, such as water and sediment. Test organisms must be highly sensitive and ecologically relevant. Gametes of the sea urchins Echinometra mathaei and Tripneustes gratilla …
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Ecotoxicology of Natural and Anthropogenic Extreme Environments
… of Mexico. In addition, the acute toxicity and sub-lethal effects of four insecticides and an herbicide are examined in the estuarine blue crab, <italics>Callinectes sapidus</italics>. Blue crabs are North Carolina's most important fishery species and are frequently found in agricultural …
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Xenobiotic metabolism and markers of genotoxicity in regulatory non-vertebrate ecotoxicological test species
… endpoints, with little consideration given to subtle sub-lethal effects such as genotoxicity. Moreover, even less information is available on the responses of lower animals and plants to such substances. In this study, the sub-lethal responses of the water flea Daphnia magna, and the …
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The Thermal Ecology of Sceloporus occidentalis
… tolerance may be a plastic trait and test the effects empirically. Most studies are based on captive lizards acclimated to laboratory conditions that do not necessarily reflect natural environments, and if thermal tolerance is plastic and affected by the recent thermal history of the animal, …
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Heavy metal pollution and blackheaded gull (larus ridibundus L.) breeding ecology
… consequences for birds and can cause a number of sub-lethal effects, such as decreased reproductive success. The concentrations of selected heavy metals (As, Cd. Co, Cu, Fe, Pb, Mn, Ni, V, Zn) and Se in eggs and feathers from populations of black-headed gulls (Larus ridibundus L.) located on …
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Intestinal helminth infections, distributions, and associations with health parameters of spring-migrating female Lesser Scaup in the upper Midwest
… between intestinal helminth infections and their sub-lethal effects on Lesser Scaup. Forty helminth taxa (20 trematodes, 14 cestodes, 4 nematodes, and 2 acanthocephalans) were identified, including one digenean (Plenosoma minimum) for the first time in Lesser Scaup and in the Midwest. Helminth …
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Persistence of ranavirus in an East-Central Illinois amphibian community
… inconclusive results concerning environmental effects on disease prevalence or the probability of mortality events. Studies investigating interspecies variation in susceptibility or transmission dynamics have concluded that host species identities strongly influence disease dynamics, however …
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CYTO-GENOTOXIC EFFECTS OF SOME PHARMACEUTICAL AND PERSONAL CARE PRODUCTS (PPCPS) ON THE FRESHWATER BIVALVE ZEBRA MUSSEL (DREISSENA POLYMORPHA)
… for an accurate risk assessment since chronic effects are much more probable. In order to enlarge this topic, we decided to evaluate the potential cyto-genotoxicity of a common antimicrobial agent (triclosan; TCS), a widespread antibiotic (trimethoprim; TMP) and three largely used NSAIDs …
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Application of Adverse Outcome Pathway framework in assessing nanogold exposure to Daphnia magna
… lifecycle, they have potential to cause harmful effects on aquatic organisms. However, there is limited information regarding harmful effects of these NMs especially at the molecular level. Daphnia magna is a planktonic crustacean known to be a filter feeder ingesting particles, microorganisms, …
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