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 71 for “"freshwater systems"”.
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Evaluating the effects of rainbow smelt on native piscivores in freshwater systems with a special focus on walleye recruitment and larval bioenergetics
… mordax)have been introduced into many new freshwater inland systems outside of its native range. In freshwater systems the interaction between rainbow smelt and native piscivores differs from species to species. In some cases predation or competitive interactions between juvenile piscivores …
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In vitro culture studies of environmental factors and the effects of copper on a fouling alga, Cladophora glomerata (L) Kützing, which occurs in South African freshwater systems
… problematic as a fouling organism in eutrophic freshwater systems in South Africa. A general consensus among scientific researchers is that C. glomerata thrives under high light conditions, temperatures between 15° C and 25° C, high inorganic nutrient concentrations, alkaline waters and low …
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Nutrient fluxes within the Berg River from 1976 to 2017, Western Cape, South Africa
Deterioration of freshwater systems due to eutrophication is increasingly a global concern because it puts stress on the already limited freshwater systems. Eutrophication is caused by elevated levels of nutrients in river systems primarily from poor land management whereby excess nutrients are …
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Freshwater bacterial diversity, functions and stability.
… worldwide with detrimental effects on ecosystems functions and services that it sustains. The relationship between biodiversity and freshwater purification remains unclear. Freshwater purification is of paramount importance for humankind as eighty percent of the worlds population is …
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Extracellular Enzyme Production and Wood Degradation by Freshwater Lignicolous Fungi
… however, whether fungi play a comparable role in freshwater systems. Although numerous fungal species have been reported from submerged wood, little is known about their degradative activities. This study was undertaken to determine for selected species of freshwater wood-inhabiting ascomycetes, …
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Microplastics as Contaminant Vectors: Influencing the Bioaccessibility of Naphthalene from Freshwater
… toxic persistent organic pollutants (POPs) in freshwater systems. The purpose of this research was to investigate the capacity of MPs to transfer naphthalene, a carcinogenic polycyclic aromatic hydrocarbon (PAHs), from freshwater systems to the human gastrointestinal tract (GIT). The focus was …
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Using urban facilities management principles to promote sustainable water management in informal settlements in South Africa
… (WTP) for the provision of sustainable drainage systems (SuDS) and greywater management infrastructure in the neighbouring informal settlement of Imizamo Yethu situated upstream of Hout Bay, Cape Town. Findings reveal that the WTP for once-off payments was R408, and R71 for once-off payments over …
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Polonium-210 in Freshwater Environments: Analytical Advances, Predictive Modelling, Food Web Transfer and Dose Assessment
… behaviour and biological transfer in freshwater ecosystems remain poorly characterized. Advances in understanding have been constrained by analytical challenges and by radiation protection frameworks that historically emphasized human health, with ecological risks only more recently …
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An Ecotoxicological Assessment of a Treated Coal-mining Effluent in the Leading Creek Watershed, Meigs County, Ohio
… impacts of the coal mining industry on freshwater systems has focused on abandoned-mined land, and the associated acid drainage and metals toxicity. Treated discharges from active mining and preparation facilities, however, can also impair lotic ecosystems through total dissolved solids …
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DYNAMICS OF MICROCYSTIS-INFECTING CYANOPHAGES IN TROPICAL FRESHWATERS THROUGH QPCR AND NEXT GENERATION SEQUENCING
… monitoring) term sampling events in different freshwater systems around Singapore. In both studies, there are two approaches, (1) to focus on Microcystis cyanobacteria and its associated Ma-LMM01-type cyanophages and (2) to use Next-Generation Sequencing (NGS) to further our understanding on …
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What lies beneath? Fungal diversity at the bottom of the Great Lakes
… Even less is known about fungi inhabiting freshwater lakes, particularly the benthic zone that may serve as an untapped resource for fungal biodiversity. This study aimed towards understanding the diversity of fungi in one of the largest freshwater systems on Earth, the North American …
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One Size Doesn't Fit All: Developing Bioavailability-based Models for Zinc Toxicity to Microalgae
… are intensifying pressures on natural ecosystems. This includes metal contamination in freshwater environments. Australia is a major miner and refiner of zinc ore. These operations could lead to increased risk of zinc contamination to freshwater systems due to spills, discharge and runoff. …
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Cooling system early-stage design tool for naval applications
… Practices and Criteria Manualfor Surface Ship Freshwater Systems and other references to create a Cooling System Design Tool (CSDT). With the development of new radars and combat system equipment on warships comes the increased demand for the means to remove the heat generated by these …
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Effects of Light and Macroinvertebrate Consumers on Detrital Microbial Biofilms in Streams
<p>In lotic freshwater systems, aquatic macroinvertebrates are key processors of biofilms that grow upon organic matter. Although macroinvertebrate effects on biofilms may depend on light availability, the combined effects of consumers and light remain unexplored. Here, I conducted experiments to …
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Algal Biomass Accrual in Relation to Nutrient Availability along a Longitudinal Gradient in the Upper Green River, Kentucky
Nutrient limitation in aquatic ecosystems results from a deficiency in nitrogen or phosphorus levels relative to cellular growth needs. Nutrient limitation of freshwater systems is a function of biotic and abiotic factors. Biotic factors include vascular and nonvascular plant community composition. …
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Risk, Reward, And The Role Of Habitat Selection On Community Dynamics In Temporary Ponds
… determinants of community structure. In freshwater systems, the lethal effects of dominant predators (particularly fish) are well established, while the transition from permanent to temporary ponds is a defining characteristic. This transition produces distinct communities characterized …
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Mathematical modeling of molecular mechanisms governing cell cycle progression in Caulobacter crescentus and differentiation of immune system progenitor cells
Mathematical modeling of biological systems can be useful to reveal new insights into biological observations. Here we apply mathematical modeling to study the underlying molecular networks driving observed behaviors of two systems. First, we apply systems biology and dynamic systems theory …
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Effects of Turbidity on Anti-Predator Response and Foraging Behavior in the Fountain Darter, Etheostoma fonticola
… stressors poses a significant threat to freshwater systems and is occurring on a global scale. The pervasive impacts of turbidity include degraded visual ability resulting in altered animal behavior. Anti-predator response and successful foraging ability, both essential elements of …
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Invertebrate Fauna of the Carapaces of the Texas River Cooter (Pseudemys texana) and the Red-Eared Slider (Trachemys scripta elegans)
… algal covering of the carapaces of 2 species of freshwater turtles, the Texas river cooter (Pseudemys texana) and the Redeared slider (Trachemys scripta elegans) at Spring Lake, Hays County, Texas. Turtles were captured from August through November 2002 using hoop nets, basking traps, and dip …
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The impacts of climate change on freshwater microbes: Insights from the field to the laboratory
… is currently one of the greatest threats to freshwater biodiversity. The microbial diversity within freshwaters is phylogenetically and functionally diverse. Yet, the impacts of warming on these complex communities are largely unknown. To date, the vast majority of research ignores the …
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