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 17 of 17 for “"Ecological risk assessment"”.
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Uncertainty analysis in ecological risk assessment modeling
… Carlo simulations for assessing parameter and risks as probabilistic distributions was used in an ecological risk assessment (ERA) model to characterize risk and address uncertainty. This study addresses the following sources of uncertainty: parameter inputs in the ERA models, risk algorithms …
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Quantifying the U.S. Coast Guard Ecological Risk Assessment on Diluted Bitumen
… must continually assess the environmental risks and update spill response plans. This research seeks to quantify the recent U.S. Coast Guard Sector Delaware Bay Consensus Ecological Risk Assessment (CERA) on diluted bitumen (DB) and compare the toxicity of DB to conventional crude (CC) …
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Northern San Francisco Bay Ecological Risk Assessment: Potential Crude by Rail Incident
<p><strong>Oil spill models, ecological risks, response options, and costs were assessed for a discharge of Bakken crude oil into the Northern San Francisco Bay from a train derailment. This assessment was based on the risk of crude by rail derailments into the San Francisco Bay; in 2014, …
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Hydrologic-Based Ecological Risk Assessment of Urban, Agriculture, and Coal Mining Impacts Upon Aquatic Habitat, Toxicity, and Biodiversity
… mine land (AUML). The work focused on assessment of aquatic toxicity, water quality, and biodiversity through investigation of associated ecological responses for both treated and untreated AMD. Relations were examined among land use/cover, chemistry, and various ecological and …
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Linking individual-based models and dynamic energy budget theory : lessons for ecology and ecotoxicology
In the context of ecological risk assessment of chemicals, individual-based population models hold great potential to increase the ecological realism of current regulatory risk assessment procedures. However, developing and parameterizing such models is time-consuming and often ad hoc. Using …
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Optimising the decommissioning of pipeline protection structures in the North Sea
… of onshore. Undertaking formal comparative assessment (CA) of alternatives to landfill such as reuse or recycling could reduce costs for taxpayer and industry, whilst promoting a circular economy around decommissioning. Before investigating potential decommissioning scenarios, it is …
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Mercury Bioaccumulation and Adverse Reproductive Effects in Snapping Turtles Inhabiting a Historically Contaminated River
… maternal transfer, and consumption risks in a long-lived aquatic omnivore, the common snapping turtle (Chelydra serpentina). I collected blood, nail, muscle, and egg tissues from turtles inhabiting an Hg contaminated gradient at a historically contaminated river, the South River, …
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Evaluation of pollution potential and bioremediation of tannery-based chromium wastes in Sub-Saharan Africa: the case of dump sites in Beit Ore Tannery in South Africa and Dogbone Tannery in Kenya
… chromium status, trace metals contamination and ecological risk assessment of tannery waste disposal of selected tannery waste dumpsites in Kenya and South Africa. Then, it assessed the potential health risk associated with the consumption of edible vegetables grown on Cr (VI) polluted soils. It …
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Assessing risk to native ecosystems: using exotic ants as a model
… species are widely recognised as drivers of ecological change. As such, understanding the processes that facilitate invasion success, and the potential mechanisms and magnitude of impact, are critical for effective biosecurity management. Predicting risk associated with exotic species, so …
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Modeling contaminant transport and fate and subsequent impacts on ecosystems
Assessing risks associated with the release of metals into the environment and managing remedial activities requires simulation tools that depict speciation and risk with accurate mechanistic models and well-defined transport parameters. Such tools need to address the following processes: (1) …
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Feral oilseed rape populations within a scottish landscape : Implications for GM coexistence and environmental risk assessment
… in relation to GM coexistence and environmental risk assessment. <br/><br/>This thesis presents a demographic study of feral oilseed rape over an 11 year period from 1993 to 2004 within a 500 km2 area of Tayside (Scotland). The number of feral oilseed rape populations increased almost five-fold …
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Assessment of coastal aquifer contamination using geochemical and health risk assessment in Maputaland formations, South Africa
… is very high. This could possibly increase the risk of aquifer contamination.The main objectives of this study is to evaluate the hydrogeochemical processes, identify the intended sources of groundwater contamination, and understanding the extent of trace metal contamination and health risk …
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Propagation of Juvenile Freshwater Mussels (Bivalvia: Unionidae) and Assessment of Habitat Suitability for Restoration of Mussels in the Clinch River, Virginia
Freshwater mussel propagation techniques were tested at the Virginia Department of Game and Inland Fisheries Aquatic Wildlife Conservation Center through a series of three experiments. Experiment 1 tested the suitability of a pond and raceway for rearing juvenile oystermussels (Epioblasma …
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Multi-scale analysis of 6PPD-quinone: distribution, environmental risk, and urbanization influence in the Delaware River Basin
… investigation of spatiotemporal distribution, ecological risk, urbanization impact and leaching dynamics of 6PPDQ across two major urban watersheds: the Schuylkill River and the Delaware River Basin both vital for drinking water supply and ecological integrity. Field sampling was conducted …
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Development and Application of Non-Traditional Vertebrate Models to Investigate Terrestrial Ecological Risk to 2,46-Trinitrotoluene Exposure
Assessing ecological risk to wildlife exposed to anthropogenic contamination in soil has traditionally been problematic. Attempts to standardize an approach to evaluate risk for various community types in North America have been challenging, given the variation in terrestrial communities and the …