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 112 for “"Freshwater Ecosystems"”.
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Microbial adaptation to dissolved organic matter in freshwater ecosystems
… composition of terrestrial DOM that enters into freshwaters, with unknown consequences for the resident bacterial communities and wider ecosystem processes. This thesis aims to characterize how bacteria adapt to compositionally-distinct DOM sources and assess the implications of these adaptations …
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Evaluating the emerging environmental risks of mycotoxins in freshwater ecosystems.
… interest into the potential transference into freshwaters. Multiple reports of mycotoxin occurrence in freshwater samples have led to their consideration as natural chemicals of emerging concern, particularly with ZON seen to act in an oestrogenic nature, yet the ecotoxicological data to …
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Invasive non-native species and the management and exploitation of freshwater ecosystems
… to ecosystem collapse and unsafe drinking water. Freshwater ecosystems are also vulnerable to the establishment of invasive non-native species (INNS), whose prevalence has rapidly accelerated through the expansion of global travel, trade, and transportation. INNS can drive significant changes in …
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An integrated planning approach for the conservation of freshwater ecosystems in South Africa
Freshwater ecosystems underpin the fabric of society and the environment, providing essential ecosystem services such as water and food, upon which all human beings depend. In order to secure these vital services requires the sustainable management of freshwater ecosystems. At present however, …
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Electron Transfer Processes between Hydrogen Sulfide and Humic Substances - Implications for Anaerobic Sulfur Cycling in Freshwater Ecosystems
The relevance of biogeochemical gradients for turnover of organic matter is yet poorly understood. This study aims at the identification and quantification of the interaction of different redox processes along gradients with particular emphasis on the impact of redox active humic substances. The …
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Dissolved organic matter dynamics in diverse freshwater ecosystems across Canada: long-term trends, transformations, and explanatory factors
… organic matter (DOM) is a key variable in freshwater ecosystems that influences numerous limnological properties and ecosystem services. While DOM dynamics have received considerable attention in certain parts of Canada, many regions remain underexplored or require updated analysis. This …
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Enhancing the conservation of freshwater biodiversity through improved freshwater conservation planning techniques
Freshwater ecosystems and biota are among the most endangered in the world. This current situation is even more disturbing when future threats of escalating human demand and global climate change are considered. Urgent measures are therefore needed to conserve freshwater ecosystems and sustain the …
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Testing the water: How communities value, use, impact and manage water-related ecosystem services originating in an urban protected area
Freshwater ecosystems and their associated landscape features found in developing cities and urban protected areas are essential components of urban social-ecological systems providing city residents with cultural, provisioning and regulating services, all of which hold value. Understanding these …
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Variations in Community Fish Production and Diversity Across the Appalachians: Implications for Climate Change
Climate change is considered a major threat to freshwater ecosystems through altering biodiversity, structure, and function. Having a thorough understanding of how diverse ecosystems respond to temperature change is vital to ecosystem management and conservation. During summer 2012, I quantified …
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Preservation of Ecosystems of International Watercourses and the Integration of Relevant Rules
The unprecedented degradation of freshwater ecosystems due to the rampant exploitation of water resources re-establishes the importance of preserving freshwater ecosystems in order to ensure their continued viability that supports the attainment of sustainable development. This concern is addressed …
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Every Last Drop: The role of spatial planning in integrated urban water management in the Cape Town City-Region
… urban water system and environment is degrading freshwater ecosystems, nature’s ability to replenish resources and the relationship between people and the environment due to unsustainable consumption and discharge patterns. This is an international phenomenon and in the City of Cape Town, where …
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Conservation of freshwater biodiversity in key areas of the Colombian Amazon
Freshwater ecosystems maintain incredible ecological processes that support millions of species, including human beings. Important goods and services ranging from food and building materials to water cleansing, flood and erosion control, cycling of nutrients and flow of energy are provided. With …
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Interannual Variability of Lotic Macroinvertebrate Communities in the Kootenay-Columbia Basin, BC: the Relative Contribution of Environmental Gradients vs. Stream Water Temperatures
Climate change is predicted to impact freshwater ecosystems through interannual variability in surface water temperature, discharge, and physiochemical water characteristics. Benthic macroinvertebrate communities (BMI) are often used to assess biological impacts of long-term environmental changes. …
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Pushing the Boundaries of Freshwater Ecosystem Restoration: Evaluating a Conservation Initiative in Terms of Social-Ecological Resilience
Freshwater ecosystems are among the most transformed systems on Earth despite their critical importance to human well-being. This research utilized a single case, embedded case study design to explore the possibility of an approach to aquatic ecosystem restoration informed by social-ecological …
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Floating Treatment Wetland Nutrient Uptake Efficiency on the Salmon River
Eutrophication and algal blooms threaten freshwater ecosystems worldwide. Constructed floating treatment wetlands (FTWs) provide a potential nature-based solution for removing nutrients and other contaminants, yet their effectiveness in the natural environment is uncertain. This study evaluated FTW …
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COMMUNITY STRUCTURE AND FUNCTIONAL DIVERSITY OF IMPERILED GREAT PLAINS FISHES: IMPLICATIONS FOR CONSERVATION OF TWO ENDANGERED SHINERS (SHARPNOSE SHINER NOTROPIS OXYRHYNCHUS AND SMALLEYE SHINER NOTROPIS BUCCULA) IN THE UPPER BRAZOS RIVER, TEXAS
… of dams have caused significant change in freshwater ecosystems, especially in the Great Plains of North America where pelagic broadcast spawning fish species are declining due to the loss of the natural flow regime and river fragmentation. Uncovering the abiotic and biotic drivers across …
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Disturbance Related Patterns in Fish Community Structure and Function in River Systems of the Lower Athabasca Oil Sands Region, Alberta
… is altering watersheds and threatening freshwater ecosystems and the resources therein. Direct impacts of industry including conversion of land cover and increased water withdrawals from rivers, compounded with indirect influences such as climate change, collectively affect the health …
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Predatory and Mutualistic Interactions between Freshwater Minnows and their Predators
… distributed across aquatic and terrestrial ecosystems and are fundamental in preserving the structure, diversity, and stability of an ecological community due to its disproportionately large impact on its community relative to its biomass. As biodiversity of ecosystems becomes more …
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