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 22 for “"Freshwater ecosystem"”.
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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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Studies on the autecology of Myriophyllum aquaticum in the South-Western Cape Province
Aquatic macrophytes are an integral part of any freshwater ecosystem. In addition to being primary producers, they assist in nutrient circulation and provide shelter and spawning areas for many other forms of associated animal life (Nichols and Keeney, 1973; De Marte and Hartman, 1974).
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The Effects of Hypoxia on Zooplankton Communities in Lakes and Reservoirs
… and behavior of organisms in a diverse suite of ecosystems. Because of climate change and eutrophication, freshwater lakes and reservoirs are experiencing an increase in low dissolved oxygen concentrations (hypoxia) in their bottom waters (hypolimnion), which can disrupt ecological communities. …
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Barrier island groundwater dynamics
… dynamics influence the availability of freshwater, ecosystem health, pollutant transport, and flooding in these densely populated communities. However, groundwater dynamics, including the aquifer head distribution and subsurface salinity structure, in coastal aquifers are affected by …
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Barrier Island Groundwater Dynamics
… dynamics influence the availability of freshwater, ecosystem health, pollutant transport, and flooding in these densely populated communities. However, groundwater dynamics, including the aquifer head distribution and subsurface salinity structure, in coastal aquifers are affected by …
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Comparative Legal Frameworks for Payments for Ecosystem Services
In recent decades, the concept of ecosystem services has deepened our appreciation of the myriad benefits provided by ecosystems, and the risks to human societies posed by ecosystem degradation. There is a growing realisation that problems traditionally considered to be outside the environmental …
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Hippopotami in a liminal space: a multi-species ethnography of Lake Tanganyika in Bujumbura
… has significantly altered Lake Tanganyika's freshwater ecosystem and riparian zone in Bujumbura, the capital city of Burundi, which affects the daily life and interactions between humans and hippopotami (hippo). Societal development agendas have favoured economic growth and infrastructural …
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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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Effects of lake trophic state and seasonal cycling on production and bioaccumulation of methylmercury in Te Arawa Lakes
… than a comprehensive assessment across multiple ecosystems. Additionally, most existing research has primarily examined elemental Hg, with limited investigation into the distribution and bioavailability of MeHg. This study aims to comprehensively assess Hg and MeHg concentrations in 11 lakes of …
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Soil erosion and suspended sediment dynamics in intensive agricultural catchments
… from agricultural river catchments to aquatic ecosystems can degrade chemical water quality and ecological habitats. Management of accelerated soil losses and the transmission of sediment-associated agricultural pollutants, such as phosphorus, is required to mitigate the drive towards …
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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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Using Fuzzy Cognitive Maps to Engage Stakeholders in the Search for Solutions to Emerging Environmental Challenges
Inland freshwater salinization is an emerging environmental problem that threatens freshwater ecosystem health, agricultural productivity, and the sustainability, reliability, and safety of drinking water supplies around the world. This body of work focuses on the Occoquan Reservoir in Northern …
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Understanding and predicting the response of reservoir zooplankton communities and water quality to climate change
Freshwater zooplankton communities are highly sensitive to environmental change and are critical indicators of water quality. Zooplankton are central organisms in freshwater food webs, composed of diverse taxa playing different functional roles in freshwater food webs as food sources for upper …
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Effects of land-use change on benthic macroinvertebrates in the upper reaches of the Apies-Pienaar catchment
… of catchment areas is a major cause of freshwater ecosystem degradation worldwide. As catchments become more developed and river ecosystems become increasingly engulfed in various land use activities, there is a growing need to understand these impacts on freshwater ecosystems. Benthic …
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Effects of Freshwater Salinization and Associated Base Cations on Bacterial Ecology and Water Quality
Anthropogenic freshwater salinization, which is caused by numerous human activities including agriculture, urbanization, and deicing, impacts an estimated 37% of the contiguous drainage area in the United States. High salt concentrations in brackish and marine environments (~1,500 – 60,000 µS cm-1) …
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Bivalve molluscs as environmental monitors and tools for sustainable water management
Freshwater environments are capable of providing a wide range of vital ecosystem services, from basic provision of drinking water to energy production, waste removal to recreation. Well-managed water resources allow such precious services to be preserved. However, anthropogenic influences have led …
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Invasive non-native species and the management and exploitation of freshwater ecosystems
… becoming increasingly common and often lead 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 …
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Ecohydrologic Modeling for Investigating the Effects of Human-Induced Environmental Stressors on Freshwater Resources
L'abstract è presente nell'allegato / the abstract is in the attachment
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The occurrence and distribution of microplastics in surficial sediments and fish in a South African reservoir
… globally due to their potential impacts on ecosystem function. They are known to be ubiquitously present, persistent and bio−accumulative, yet ecological impacts of microplastic remain poorly understood despite their ubiquity across all habitat types globally. The combined effects of …
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