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Dissertations / Theses on the topic 'Aquatic toxicology'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Sved, Daniel W. "Monooxygenase induction and lethality as endpoints in aquatic toxicology." W&M ScholarWorks, 1991. https://scholarworks.wm.edu/etd/1539616869.

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Spot, Leiostomus xanthurus, were exposed to suspended sediments (&\approx&20 mg/L) contaminated with polycyclic aromatic hydrocarbons (PAH) in a laboratory flow-through system to evaluate the applicability of hepatic ethoxyresorufin O-deethylase (EROD) induction as an indicator of PAH exposure. PAH sources tested were coal-tar creosote (CTC), a low molecular weight fraction of creosote (LMWF), and a high molecular weight fraction of creosote (HMWF). A standard 96-h acute toxicity test was conducted to ensure that PAH concentrations tested in induction studies were sub-acutely toxic. The 96-h L

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2

Méndez, Sara I. Semlitsch Raymond D. "Aquatic and terrestrial exposure of amphibians to estrogenic endocrine disrupting contaminants." Diss., Columbia, Mo. : University of Missouri--Columbia, 2009. http://hdl.handle.net/10355/6183.

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Title from PDF of title page (University of Missouri--Columbia, viewed on Feb 15, 2010). The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Dissertation advisor: Raymond D. Semlitsch Vita. Includes bibliographical references.

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3

Smith, E. C., Phillip R. Scheuerman, and Kurt J. Maier. "Toxicity of Nanomaterials to Aquatic Organisms." Digital Commons @ East Tennessee State University, 2005. https://dc.etsu.edu/etsu-works/2939.

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4

Webb, Diane. "Assessment of the health of the Swan-Canning river system using biochemical markers of exposure of fish." Thesis, Curtin University, 2005. http://hdl.handle.net/20.500.11937/62.

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Most environmental studies concerning the environmental health of the Swan- Canning River system have focussed on nutrient inputs from both rural and urban catchments that are the cause of algal blooms. On occasions these algal blooms have resulted in fish deaths attributed to oxygen starvation. Relatively few studies have examined whether non-nutrient contamination is affecting the health of the riverine environment. Those studies that have, have concentrated on measuring the levels of heavy metals, organochlorines, organophosphates, and hydrocarbons in the sediments and water of the river sy

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5

Gausman, Maria M. "A COMPARISON OF DUCKWEED AND STANDARD ALGAL PHYTOTOXICITY TESTS AS INDICATORS OF AQUATIC TOXICOLOGY." Miami University / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=miami1153752259.

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6

Wong, Wing-yu, and 黃詠如. "Ecotoxicological effects of selected engineered nano-materials to aquatic organisms in relation to their physicochemicalcharacteristics." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B47869410.

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Engineered nanomaterials (NMs), defined as artificially made particles possessing at least one dimension within 1 – 100 nm range, have different physical and biological properties from bulk materials of the same chemistry due to their increased surface areas. Their novel properties have facilitated the prolific growth of commercial NM-incorporating products. NMs may be leached into the aquatic environment during the product life-cycle, but their ecological impacts on marine ecosystems are currently largely unknown. Therefore, this study primarily aimed to investigate the physicochemical chara

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7

Cho, Eun-ah. "Bioturbation as a novel method to characterize the toxicity of aquatic sediment." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-02282005-111535/.

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Bioturbation, the biological process through which many species of infaunal benthic invertebrates suspend bottom sediments into the water column through their burrowing, feeding, respiratory, and locomotor activities, may be a sub-lethal endpoint that can be exploited to assess the toxicity of aquatic sediments. Therefore, we developed a novel test method that used bioturbation (BioTurbTox test) generated by the activities of second in-star Chironomus tentans larvae as the toxicity endpoint (Chapter 2). To validate this method, copper (Cu) and fluoranthene were individually spiked into relativ

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8

Atkinson, Susanna Kate. "The persistence of steroidal estrogens in the aquatic environment." Thesis, University of Ottawa (Canada), 2009. http://hdl.handle.net/10393/28120.

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The presence and fate of the steroidal estrogens, estrone (E1), 17beta-estradiol (E2) and 17alpha-ethinylestradiol (EE2), in Ottawa and Cornwall wastewater treatment plants (WWTP's), drinking water, and the river water used as the drinking water source, were identified. Estrogens were extracted using accelerated solvent extraction, gel permeation chromatography and solid phase extraction, and identified using gas chromatography-mass spectrometry and internal C-13 standards. E1, E2 and EE2 concentrations ranged from 1.8 to 370, 24.3 to 66.9 and 0.4 to 9.8 ng L-1, respectively, and were affected

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9

Cronin, Mark T. D. "Quantitative structure-activity relationships of comparative toxicity to aquatic organisms." Thesis, Liverpool John Moores University, 1990. http://researchonline.ljmu.ac.uk/4989/.

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Quantitative Structure-Activity relationship (QSAR) attempt statistically to relate the physico-chemical properties of a molecule to its biological activity. A QSAR analysis was performed on the toxicities of up to 75 organic chemicals to two aquatic species, Photobacterium phospherum (known as the Microtox test), and the fathead minnow. To model the toxicities 49 physico-chemical and structural parameters were produced including measures of hydrophobicity, molecular size and electronic effects from techniques such as computational chemistry and the use of molecular connectivity indices. These

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10

Duggan, Sam B. "Complex metal mixture reduces apparent protein carbonylation in a tolerant aquatic macroinvertebrate, Arctopsyche grandis." Thesis, Colorado State University, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=1606539.

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<p> Mining is widespread and an economically important industry. Unfortunately, acid mine drainage (AMD) can pollute ecosystems with a cocktail of contaminants too complex for accurately forecasting its health consequences. However, through quantification of fundamental toxic events, the effects of complex mixtures can be observed. This project explored two potentially insightful and convenient endpoints. First, oxygen consumption (MO<sub>2</sub>), a well-established and sensitive indicator of respiratory impairment was utilized. Second, protein carbonyl content (PCC), an experimental ecologic

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11

Child, P. "The toxicity of flue gas desulphurisation effluent to freshwater organisms." Thesis, University of Nottingham, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.261111.

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12

Cumming, Janet L. "Environmental Fate, Aquatic Toxicology and Risk Assessment of Polymeric Quaternary Ammonium Salts from Cosmetic Uses." Thesis, Griffith University, 2008. http://hdl.handle.net/10072/365855.

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The consumption of household and personal care products in Australia is similar to that of more highly regulated agricultural and veterinary chemicals. One class of chemical used in cosmetic applications, polymeric quaternary ammonium salts (polyquaterniums), is thought to have adverse effects on aquatic organisms. These polymers belong to a larger class of polymers, cationic polyelectrolytes, that are widely used in industry, largely for water treatment, and that have been extensively studied and regulated. The cosmetic polyquaterniums, however, have not been subject to the same scrutiny, eve

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13

Malaspina, Igor Cruz. "Eficácia biológica e feitos tóxicos de fontes de cobre e diquat para organismos aquáticos /." Jaboticabal, 2016. http://hdl.handle.net/11449/138219.

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Orientador: Silvano Bianco<br>Coorientador: Robinson Antonio Pitelli<br>Banca: Lúcia Helena Sipaúba Tavares<br>Banca: Claudinei da Cruz<br>Banca: Silvia Patrícia Carraschi de Oliveira<br>Banca: Matheus Nicolino Peixoto Henares<br>Resumo: As macrófitas aquáticas possuem papel fundamental nos ecossistemas aquáticos participando dos processos de ciclagem de nutrientes, além de servirem como abrigo e alimento para muitas espécies de peixes e outros organismos. Dentre os principais métodos de controle de macrófitas está o controle químico com o uso de herbicidas. O objetivo deste estudo foi realiza

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14

Harris, Graham. "A comparison of aquatic species responses to anticancer drug exposure." Thesis, Brunel University, 2015. http://bura.brunel.ac.uk/handle/2438/12731.

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To date, limited research has been conducted on the effects of cytotoxic drugs on aquatic species. Three of these species, a single celled plant, an invertebrate and a fish, were exposed to six cytotoxic drugs, both singly and as simple mixtures. A range of endpoints were assessed, including growth inhibition in algae, immobilisation in daphnia and the impact on organ size and the expression of the DNA damage repair genes RAD51 and p53 in zebrafish. No effects at environmentally relevant concentrations were observed in any of the three species.

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15

Jatar, Muriel M. "Assessing the Effect of Selenium on the Life-cycle of Two Aquatic Invertebrates: 'Ceriodaphnia dubia' and 'Chironomus dilutus'." Thèse, Université d'Ottawa / University of Ottawa, 2013. http://hdl.handle.net/10393/24036.

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Runoff and effluent discharge from mining activities has resulted in elevated concentrations of selenium in aquatic ecosystems. Bioavailability is dependent on chemical speciation. Although dissolved inorganic Se species are not directly toxic to organisms, uptake by primary producers and subsequent biotransformation to organo-selenium species substantially increase risk and bioaccumulation potential, potentially impairing reproduction in high-order organisms. The effects of dietary selenium exposure were assessed in two aquatic invertebrates: Ceriodaphnia dubia and Chironomus dilutus. Two gen

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16

Bourdon, Lisa Marie. "An integrative approach to characterizing the estrogenicity gradient of a portion of the South Platte River." Thesis, University of Colorado at Denver, 2016. http://pqdtopen.proquest.com/#viewpdf?dispub=10112628.

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<p>Endocrine disrupting compounds (EDCs) from agricultural, industrial, and municipal sources can be found in many surface waters with potential adverse implications for human and ecosystem health. The South Platte River represents a significant source of water for the Denver Metro Area, yet little data exists concerning EDCs. The aim of this study is to evaluate the occurrence and effects of EDCs downstream from two major wastewater treatment plants (WWTPs). This study characterizes the estrogenicity gradient of the South Platte River in the Denver Metro area by combining data from qPCR analy

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17

Zhang, Wo Su. "Naphthenic Acids Disrupt Courtship in Silurana tropicalis." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41148.

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Neuroendocrine processes coordinate the behavioural, physiological, and seasonal aspects of reproduction. Some chemicals can disrupt the hypothalamus-pituitary-gonadal axis, impacting reproductive health. Naphthenic acids (NAs), the carboxylic acids in petroleum, are of emerging concern as they contaminate coastlines after oil spills and aquatic ecosystems of the Athabasca oil sands area. They are acutely toxic in fish and tadpoles and possibly endocrine disrupting at sublethal levels. I characterized courtship behaviours and disruption by NAs in the Western clawed frog, Silurana tropicalis. C

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18

Webb, Diane. "Assessment of the health of the Swan-Canning river system using biochemical markers of exposure of fish." Curtin University of Technology, Department of Environmental Biology, 2005. http://espace.library.curtin.edu.au:80/R/?func=dbin-jump-full&object_id=16725.

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Most environmental studies concerning the environmental health of the Swan- Canning River system have focussed on nutrient inputs from both rural and urban catchments that are the cause of algal blooms. On occasions these algal blooms have resulted in fish deaths attributed to oxygen starvation. Relatively few studies have examined whether non-nutrient contamination is affecting the health of the riverine environment. Those studies that have, have concentrated on measuring the levels of heavy metals, organochlorines, organophosphates, and hydrocarbons in the sediments and water of the river sy

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19

O'Reilly, Kirk Thomas. "The role of copper in the apparent aluminum toxicity of aquatic systems." PDXScholar, 1985. https://pdxscholar.library.pdx.edu/open_access_etds/3522.

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The effect of variations in aluminum and copper concentrations on the growth rate and enzyme activity of the green alga Scenedesmus quadricauda was investigated. The goal was to determine which chemical species control the biological parameters. The computer program MINEQL (Westal et al 1976) was used to estimate chemical speciation. In the prevalence of both metals, algal growth rate and alkaline phosphatase activity could be correlated to cupric ion activity. The activity of isolated bacterial alkaline phosphatase was found to be a function of both total copper concentration and cupric ion a

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20

Koesoemadinata, Santosa. "Aquatic toxicology of selected rice insecticides, with special reference to their effects on fish culture in West Java, Indonesia." Thesis, University of Stirling, 1990. http://hdl.handle.net/1893/3530.

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Insecticides are widely used in SE Asian countries to control insect pests in rice, mainly stemborers (Chilo suppresallis) and brown plant hoppers (Nilaparvata lugens). The use of highly toxic insecticide compounds, however, is known to cause serious problem for fish culture in wet rice fields in many of these countries, particularly in Indonesia where this practice assumes a tremendous "house hold economic" importance, as well as being an essential part of the nation's inland aqua-culture production system. The laboratory and field experiments described were carried out to establish

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21

Martinez, Cynthia Therese 1969. "Selenium levels in selected species of aquatic birds on Imperial National Wildlife Refuge." Thesis, The University of Arizona, 1994. http://hdl.handle.net/10150/278452.

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Five species of waterbirds were collected from five sites on Imperial National Wildlife Refuge between April and August of 1993. There were previous baseline contaminants data for all sites. Sites were of two distinct habitat types. Backwater lakes have a direct connection to the mainstem of the Colorado River, and seep lakes receive river water only via seepage through the soil column. Selenium concentrations in liver, kidney, and muscle tissues were consistently higher in birds collected from backwater lakes than those collected from seep lakes. Eighty-one percent of the birds collected on b

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22

Belanger, Scott E. "Functional and pathological responses of selected aquatic organisms to chrysotile asbestos." Diss., This resource online, 1985. http://scholar.lib.vt.edu/theses/available/etd-05222007-091305/.

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23

Santagostino, S. F. "AQUATIC POLLUTION AND BIOLOGICAL MONITORING OF THE MARINE ENVIRONMENT: TOXICOLOGY, HISTOPATHOLOGY AND ECOLOGICAL RISK OF SELECTED FISH SPECIES." Doctoral thesis, Università degli Studi di Milano, 2016. http://hdl.handle.net/2434/350847.

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The impact of multiple anthropogenic stressors on the marine environment has increased to large extents within the past few decades. Piscivorous fish can bioaccumulate pollutans to significantly higher concentrations than those found in the water or sediments, due to the lipid solubility and resistance of these compounds to numerous degenerative processes. The use of fish from different hydrological settings as bio-indicators represents a useful complementary choice to evaluate the levels and responses of marine organisms to pollutans, and to assess the global marine status. The purpose of thi

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24

Stanley, Jacob K. Brooks Bryan William. "Effects of chiral contaminants to aquatic organisms pharmaceuticals as model compounds for enantiomer specific ecological hazard assessment /." Waco, Tex. : Baylor University, 2006. http://hdl.handle.net/2104/5104.

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25

Chapman, Kimberly K., Michael J. Benton, Ralph O. Brinkhurst, and Phillip R. Scheuerman. "Use of the Aquatic Oligochaetes Lumbriculus Variegatus and Tubifex Tubifex for Assessing the Toxicity of Copper and Cadmium in Spiked-Sediment Toxicity Bioassay." Digital Commons @ East Tennessee State University, 1999. https://dc.etsu.edu/etsu-works/2881.

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A sediment toxicity test using the freshwater oligochaetes Lumbriculus variegatus and Tubifex tubifex was performed. We evaluated acute and chronic toxicity affects of copper and cadmium on reproduction in both species and the bioaccumulation of both metals by L. variegatus using artificial sediment. L. variegatus bioconcentrated copper 22‐fold and cadmium 16‐fold after a 14‐day exposure to spiked artificial sediments with 0.02% organic content. The EC50 for T. tubifex varied depending upon endpoint from 2.7 to 2.8 mg/L for cadmium and from 8.4 to 8.9 mg/L for copper. The EC50 for L. variegatu

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26

Lahman, Sara Elisabeth. "The Ecotoxicological Impacts of Copper in Aquatic Systems." Bowling Green State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1427119997.

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27

Dobbins, Laura L. Brooks Bryan William. "Chemical toxicity distributions in aquatic toxicology relative sensitivities of estrogenicity assays and ecotoxicity of parabens in model freshwater organisms /." Waco, Tex. : Baylor University, 2009. http://hdl.handle.net/2104/5350.

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28

Arnolds, Judith Lize. "Oxidative stress responses in the aquatic macrophyte, Ceratophyllum Demersum L., as biomarkers of metal exposure." Thesis, Cape Peninsula University of Technology, 2017. http://hdl.handle.net/20.500.11838/2649.

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Thesis (DTech (Environmental Health))--Cape Peninsula University of Technology, 2017.<br>Metal pollution in aquatic environments is considered a major environmental concern because of variation in several abiotic factors that impose severe restrictions on organisms living in these areas. Ceratophyllum demersum L. (family Ceratophyllaceae), a hornwort or coontail, free floating rootless macrophyte has been suggested a suitable model for investigating metal stress and was used in the current study. This study assessed the use of selected biological responses, namely antioxidant responses and cha

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29

Halffman, Willem. "Boundaries of regulatory science eco/toxicology and aquatic hazards of chemicals in the US, England, and the Netherlands, 1970-1995 /." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2003. http://dare.uva.nl/document/67455.

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30

Cregger, S. S., and Phillip R. Scheuerman. "A Rapid Biochemical Test Using Cell Lines for Measuring Chemical Toxicity in Aquatic Systems." Digital Commons @ East Tennessee State University, 1993. https://dc.etsu.edu/etsu-works/2896.

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31

Smith, Abraham Jeffrey. "Development and Application of Aquatic Toxicology Studies for the Assessment of Impacts Due to Chemical Stressors Using Non-Standard Indigenous Organisms." FIU Digital Commons, 2018. https://digitalcommons.fiu.edu/etd/3709.

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Research in the multidisciplinary science of ecotoxicology is crucial to assess injuries to ecosystem resources from chemical spills or other stressors used to support environmental decision-making. Established guidelines recommend the use of non-standard native species in toxicity investigations. This work focused on the use of native species for aquatic toxicity assessment to make more relevant conclusions on the potential for adverse biological effects to occur as a result to single chemical exposures or exposures to a complex mixture like oil. We apply these studies to investigate petroleu

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32

Albanese, Katie. "Photochemistry and Toxicity of Triclosan, Triclocarban, and their Photoproducts and Mixtures in Freshwater Systems." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1468967416.

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33

Binder, Markus. "An evaluation of recirculating artificial stream designs for acute toxicity testing using two South African Ephemeroptera species exposed to sodium sulphate." Thesis, Rhodes University, 2000. http://hdl.handle.net/10962/d1005376.

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Three artificial stream designs, termed Large Artificial Stream Units (LASUs), Raceways, and Channels, at two major scales (1700 L, 12.5 L and 20 L recirculated volume) were developed at the Institute for Water Research, Rhodes University, Grahamstown, in order to explore the possibilities of using indigenous rheophilic macroinvertebrates in routine toxicity tests. This study compared these systems, using 96h-EC50 values from sodium sulphate toxicity tests as the experimental response. Two local Ephemeroptera (Leptophlebiidae: Adenophlebia auriculata Eaton, and Baetidae: Afroptilum sudafricanu

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34

Moraes, Joelma Crespo. "Efeitos do Thiodan® (endosulfan) nas brânquias de Astyanax aff. bimaculatus." Universidade Federal de Viçosa, 2011. http://locus.ufv.br/handle/123456789/5085.

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Made available in DSpace on 2015-03-26T13:47:02Z (GMT). No. of bitstreams: 1 texto completo.pdf: 1671012 bytes, checksum: 403ddd0d13dc2890004dae5a13c0606b (MD5) Previous issue date: 2011-08-04<br>One of the factors most relevant in environmental pollution that involves the ecosystem is the contamination by pesticides, especially when these are applied indiscriminately. Between these compounds are pesticides with several chemical compositions that are used with different aims. The aquatic environment has been considered the most relevant toxic receptor compartment, and so has attracted attent

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35

Huerta, Buitrago Belinda. "Pharmaceuticals and endocrine disruptors: accumulation in aquatic biota and environmental effects." Doctoral thesis, Universitat de Girona, 2016. http://hdl.handle.net/10803/402946.

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Occurrence, fate, and adverse effects of emerging contaminants in the aquatic environment have become a matter of concern, since these compounds have been persistently detected in wastewater treatment plant (WWTP) effluents, surface water, seawater and groundwater all over the globe. The incessant release of emerging contaminants into freshwater ecosystems could affect a broad variety of organisms: from bacterial communities to fish, as well as aquatic plants and insect larvae. The present thesis aimed to investigate the potential bioaccumulation and biomagnification of two groups of emerging

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36

Gendusa, Tony C. "Toxicity of Chromium and Fluoranthene From Aqueous and Sediment Sources to Selected Freshwater Fish." Thesis, University of North Texas, 1990. https://digital.library.unt.edu/ark:/67531/metadc330672/.

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Research efforts in aquatic toxicology have historically centered on the chemical analyses and toxic effects of waters to aquatic organisms. More recently, sediment-source toxicity has been explored, with efforts concentrated on establishing sensitive and accurate methodologies. This study focused on the toxicity of trivalent chromium, hexavalent chromium, and fluoranthene to Pimephales promelas, Ictalurus punctatus, and Lepomis macrochirus. Test fish were exposed to both water-borne and sediment-source toxicants for 96 hours (h) and 30 days (d). A 96-h and 30-d LC50 (mg/L Cr, ug/L Fluoranthen

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37

Mennigen, Jan A. "The Serotonergic System as a Target for Neuroendocrine Disruption in the Brain of Goldfish (Carassius auratus)." Thèse, Université d'Ottawa / University of Ottawa, 2011. http://hdl.handle.net/10393/19927.

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Serotonin stimulates reproduction and inhibits feeding/growth in the neuroendocrine brain of goldfish. The objective of this thesis is to study the effects of selective serotonin reuptake inhibitor pharmaceuticals (SSRIs) on these systems, as SSRIs, such as fluoxetine, are detected in effluent and bioconcentrate in the brain of wild fish. Genes of the serotonin system were cloned to identify molecular conservation, seasonal expression, and tissue distribution. The serotonin transporter, the target molecule of fluoxetine, was highly conserved and ubiquitously expressed in goldfish. Seasonal cha

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38

Thomas, Carolyn L. "Development of a test system for screening toxic substances: a comparison using organic substances." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/49941.

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The purpose of this research was to develop a test system for screening toxic substances by predicting their aquatic ecosystem effects. The system studied was a static, one liter microcosm with a diverse species assemblage. Teh microcosm was composed of biotic inoculum, chemically defined medium and sediment. The biotic inoculum cotained primary producers, grazers, carnivores and decomposers. The chemical medium used was Taub #82 modified by adding sodium bicarbonate. Three different types of sediment were studied: sand, clay and clay plus sand. Four organic chemicals: phenol, triethylene

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39

Pokhrel, Lok R., Thilini Silva, Brajesh Dubey, Badawy Amro M. El, Thabet M. Tolaymat, and Phillip R. Scheuerman. "Rapid Screening of Aquatic Toxicity of Several Metal-Based Nanoparticles Using the Metplate™ Bioassay." Digital Commons @ East Tennessee State University, 2012. https://dc.etsu.edu/etsu-works/2873.

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Current understanding of potential toxicity of engineered nanomaterials to aquatic microorganisms is limited for risk assessment and management. Here we evaluate if the MetPLATE™ test can be used as an effective and rapid screening tool to test for potential aquatic toxicity of various metal-based nanoparticles (NPs). The MetPLATE bioassay is a heavy metal sensitive test based on β-galactosidase activity in Escherichia coli. Five different types of metal-based NPs were screened for toxicity: (1) citrate coated nAg (Citrate-nanosilver), (2) polyvinylpyrrolidone coated nAg (PVP-nAg), (3) uncoate

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40

Snyder, Craig David. "Physiological, population, and genetic responses of an aquatic insect (Isonychia bicolor) to chronic mercury pollution." Diss., This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-06062008-165554/.

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41

Maharjan, Renu. "Phytoremediation of Selected Pharmaceuticals by and their Phytotoxicity to Aquatic Plants." University of Toledo / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1396172003.

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42

Weaver, Meghan C. "Effects of Copper Sulfate Application on Zooplankton and Macroinvertebrate Communities in Upground Reservoirs." Bowling Green State University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=bgsu1339094079.

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43

Hum, Stanley. "Detection of latent heritable genetic damage in populations of aquatic snails, Lymnaea stagnalis, exposed in situ to genotoxic pollution." Thesis, McGill University, 1999. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=30670.

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We hypothesized that populations exposed to chronic levels of genotoxins for many generations in situ will accumulate latent heritable genetic damage leading to increases in mutational load and decreased population fitness. Common pulmonate snails (Lymnaea stagnalis) were collected from three sites that differed in pollution level [Manitoulin Island (reference), Beauharnois (moderate pollution), and Varennes (highly polluted)]. These organisms have a rapid generation time and are capable of self-fertilization. Fitness indicators were clutch size, survival (hatching to day 30) and growth (lengt

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44

Waye, Andrew. "An Investigation of Pulp Mill Effluents and Their Wood Feedstocks as Potential Neuroendocrine Disruptors of the Fish Reproductive Axis." Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32145.

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Common observations of reduced gonad size and spawning inhibition in wild and laboratory raised fish exposed to pulp mill effluents indicate that reproductive neuroendocrine signalling pathways may be upset. This thesis supported the neuroendocrine disruption of reproduction hypothesis by identifying potential disruptors and targets where these impacts may occur. A mechanistic study of the in vivo fathead minnow (FHM) spawning assay used by industry to assess effluent quality showed that ovulation, but not milt production, was impaired. This finding supported the hypothesis that the neuroendoc

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45

De, Almeida Louise Kashiyavala Sophia. "The detection of glyphosate and glyphosate-based herbicides in water, using nanotechnology." Thesis, Rhodes University, 2015. http://hdl.handle.net/10962/d1019755.

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Glyphosate (N-phosphonomethylglycine) is an organophosphate compound which was developed by the Monsanto Company in 1971 and is the active ingredient found in several herbicide formulations. The use of glyphosate-based herbicides in South Africa for the control of alien invasive plants and weeds is well established, extensive and currently unregulated, which vastly increases the likelihood of glyphosate contamination in environmental water systems. Although the use of glyphosate-based herbicides is required for economic enhancement in industries such as agriculture, the presence of this compou

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Smith, David P. (David Paul) 1956. "Responses of Pristina leidyi Smith 1896 (Naididae: Oligochaeta) to Cadmium, Vanadium, and Some Environmental Factors." Thesis, University of North Texas, 1990. https://digital.library.unt.edu/ark:/67531/metadc500695/.

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Concern over sediment toxicity has increased the need for toxicity test information with organisms that inhabit sediments. Oligochaetes are exposed to toxicants through feeding and direct body contact with aquatic sediments. Chronic testing with oligochaetes has historically focused on tubificids with test lengths of one year or more to encompass several generations. Most naidid oligochaetes have generation times of three to seven days and could provide chronic information in a matter of weeks. The cosmopolitan distributed naidid, Pristina leidyi, was evaluated for use as a toxicity test organ

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Michielan, Lisa. "Advance Methodologies in Linear and Nonlinear Quantitative Structure-Activity Relationships (QSARs): from Drug Design to In Silico Toxicology Applications." Doctoral thesis, Università degli studi di Padova, 2010. http://hdl.handle.net/11577/3422242.

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Novel computational strategies are continuously being demanded by the pharmaceutical industry to assist, improve and speed up the drug discovery process. In this scenario chemoinformatics provide reliable mathematical tools to derive quantitative structure-activity relationships (QSARs), able to describe the correlation between molecular descriptors and various experimental profiles of the compounds. In the last years, nonlinear machine learning approaches have demonstrated a noteworthy predictive capability in several QSAR applications, confirming their superiority over the traditional linear

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Dixon, William J., and bill dixon@dse vic gov au. "Uncertainty in Aquatic Toxicological Exposure-Effect Models: the Toxicity of 2,4-Dichlorophenoxyacetic Acid and 4-Chlorophenol to Daphnia carinata." RMIT University. Biotechnology and Environmental Biology, 2005. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20070119.163720.

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Uncertainty is pervasive in risk assessment. In ecotoxicological risk assessments, it arises from such sources as a lack of data, the simplification and abstraction of complex situations, and ambiguities in assessment endpoints (Burgman 2005; Suter 1993). When evaluating and managing risks, uncertainty needs to be explicitly considered in order to avoid erroneous decisions and to be able to make statements about the confidence that we can place in risk estimates. Although informative, previous approaches to dealing with uncertainty in ecotoxicological modelling have been found to b

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Albertus, Randal Marius Colin. "Ecotoxicity and environmental fate of diesel and diesel blends produced by Sasol’s Fischer-Tropsch processes using natural gas and coal as feedstock as well as biodiesel and biodiesel blends." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71807.

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Thesis (PhD)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: World crude oil demand and production is set to increase in the long term and is projected to increase from 82 barrels per day in 2007 to an estimated 104 million barrels per day in 2030 according to the International Energy Agency. The environmental challenges posed by the current and projected increased future fuel use, with specific reference to air, aquatic and terrestrial impact, are driving producers and legislators to change fuel specifications and consequently fuel properties to be less harmful to the environment. Tradit

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Castro, Català Núria de. "Invertebrate community responses to pollutants in mediterranean basins : insights from ecotoxicological approaches = Respostes de la comunitat d'invertebrats als contaminants en conques mediterrànies: aproximacions ecotoxicològiques." Doctoral thesis, Universitat de Barcelona, 2016. http://hdl.handle.net/10803/386400.

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Aquatic systems are under pressure from multiple stressors that affect the structure, the functioning, and the health of species, communities and ecosystems. One of the main human pressures affecting the Earth’s ecosystems is chemical pollution. Large-scale chemical production has led to the release of these compounds from agricultural, industrial, and municipal waste, into riverine, transitional, and marine waters. These pollutants can cause harmful effects on aquatic species and communities, in turn causing severe negative impacts on the structure and functioning of ecosystems, and the good

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