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 31 for “"Aquatic system"”.
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Experimental Investigation on Microplastics Biofouling Rate in an Aquatic System
… concern in freshwater and marine ecosystems. They originate from numerous sources, can easily move due to their small size, and hold the potential to transport pollutants through their movements in marine and freshwater ecosystems. Hence, formulating the distribution and movement of …
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The Removal of Pharmaceuticals from Wastewater by Wet-Air Oxidation
… and personal care products (PPCPs) in aquatic environments has raised concerns about potential adverse effects on aquatic ecology and human health. Certain pharmaceuticals have recently become a major focus of research to better understand the routes and persistence of these compounds …
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Patterns of microbial community development in isolated aquatic systems
… of microbial community development in isolated aquatic systems to the MacArthur-Wilson equilibrium theory of island biogeography and suggest alternative models for the observed patterns. Water-filled plastic containers were used as aquatic islands to investigate the colonization dynamics of …
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The Development and Evaluation of an Index of Biotic Integrity for Small Lakes in Western and Central New York
The ecological "health" of aquatic ecosystems is important to scientists, resource managers, and the general public. In order to properly protect or restore the integrity of an aquatic system we must first accurately assess its present condition. The Index of Biotic Integrity (IBI) is a relatively …
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GLOBAL ASSESSMENT OF RADIOCARBON ISOTOPIC ANALYSIS FOR PARTICULATE AND DISSOLVED ORGANIC CARBON IN RIVERINE SYSTEMS
… carbon (POC, DOC) into inland waters and coastal systems and provide a fundamental linkage between the terrestrial, oceanic, and atmospheric carbon reservoirs. Recent studies have examined the relationship between the quantity and form (POC vs. DOC) of carbon delivered to the aquatic system; …
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Controlled Evaluation of Metal-Based Nanomaterial Transformations
… concerns about the potential risks they pose to aquatic life. Predicting these risks requires an understanding of MNPs' chemical transformations. In this study, arrays of immobilized MNPs fabricated by nanosphere lithography (NSL) were used to investigate environmental transformations of MNPs. …
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Assessing the spatiotemporal variation of phytoplankton biomass in Nandoni reservoir in the Vhembe District (South Africa) using LANDSAT satellite imagery
… biomass to determine the trophic state of the aquatic ecosystem. Traditional approaches for monitoring aquatic system are time consuming, expensive, and non–continuous, therefore, Remote Sensing technologies are qualitative for monitoring the status for water quality in large scale and low …
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Crayfish: Scavenger or deadly predator? Examining a potential predator-prey relationship between crayfish and benthic fish in aquatic food webs
… proportion of benthic invertebrate biomass in an aquatic system. Commonly referred to as a keystone species, crayfish are seen as ecologically important for their consumption of detritus and algal material, as well as for their role as a common prey item for over 200 North American animal species. …
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Environmental dynamics of Benomyl and Thiabendazole
… fate and distribution in the terrestrial and aquatic phases of a laboratory microcosm comprised of silty clay loam soil and plants. The soil component constituted a major relocation site, with approximately 45 and 75% of initial Benomyl (recovered as MBC) and Thiabendazole concentrations being …
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Biogeochemical Transformations of Trace Element Pollutants During Coal Combustion Product Disposal
… requirements. The current coal ash management system is based on risk assessments of coal ash that do not include environmental parameters that have a profound impact on coal ash contaminant mobility, particularly for the toxic elements such as mercury, arsenic, and selenium. This dissertation …
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Investigation of the Volga River sediments composition : inorganic pollutants of potential concern
… group of Prof. H.F. Schöler) of the Volga rivers aquatic sediments were carried out. Starting with the work of Züllig (1956) sediments have been recognized and used extensively as an almost ideal compartment for the description of the current condition of an aquatic system. Acting as a buffer …
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The complexity of antibiotic resistance dynamics in scarce surface water resources in northern Botswana
… is widely associated with intensive agricultural systems, pharmaceutical production, wastewater, and health facilities. However, little research has been conducted on AR gene (ARG) dynamics in natural environments lacking large-scale human inputs. In particular, we have a limited understanding of …
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An ephemeral perspective of fluvial ecosystems: Viewing ephemeral rivers in the context of current lotic ecology
… the physical habitat template of these river ecosystems. An analysis of long-term hydrologic records revealed that the variation in mean annual runoff and peak discharge were nearly four times higher than the global average, rendering the rivers among the most variable fluvial systems yet …
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A multi-scale assessment of aquatic ecosystem processes across the land-ocean-atmosphere continuum: from headlands to the sea
Freshwater systems provide a unique cross-section of earth processes, linking terrestrial, aquatic, marine, and atmospheric reservoirs. Once thought to be passive pipes connecting land to sea, rivers are increasingly recognized as dynamic players in global carbon cycling. Rainfall mobilizes …
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Reactivity and Chemical Characterization of Dissolved Organic Matter in an Estuary
… Swamp through the Elizabeth River/Chesapeake Bay system to the coastal Atlantic Ocean off Virginia, USA. Results show that both carboxylic acids and aromatic compounds are lost along the transect, while amide, and carbohydrate moieties could have a mid-transect source.</p> <p>Addressing the …
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DESORPTION OF COPPER FROM ILLITE CLAY USING A CHELATING RESIN ENCAPSULATED BETWEEN POROUS MEMBRANES
… of heavy metals in the environment. In aquatic environments, the nature of trace metals, whether free, adsorbed, or complexed controls impact on biota. Often, major portions of the trace metals present in an aquatic system are immobilized on suspended particulates. Changes in …
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Metagenomic amplicon sequencing as a rapid and high-throughput tool for aquatic biodiversity surveys
Healthy aquatic systems are essential for life on this planet, and provide a variety of goods and services for humans such as drinking water, food production, waste disposal, and climate regulation. Anthropogenic impacts such as over exploitation of aquatic resources, introductions of invasive …
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Investigating the relationship between nitrification and pathogen reduction in biological wastewater treatment systems
… the potential of biological wastewater treatment systems in contributing to disinfection of municipal wastewater. The research focused on the microbial mediated processes occurring at secondary treatment and their effect on faecal coliform and E. coli numbers. The activated sludge system which is …
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