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 15 of 15 for “"rivers and estuaries"”.
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Dissolved organic nitrogen in the river test and estuary
Studies of nutrients in rivers and estuaries have generally focused on dissolved inorganic nitrogen (DIN), although this accounts for only a part of the total nitrogen (TN) in these systems. Dissolved organic nitrogen (DON) has not yet been fully considered as a factor contributing to the nitrogen …
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An investigation of heavy metal tolerance and reproduction in Nereis diversicolor with reference to their use for biomonitoring
… responsible for contamination of coastal and estuarine waters. All stages of metal production are sources of contamination, the main contributors being acidic mine drainage waters and smelting works. Other major sources are industrial water discharges, sewage sludge, the atmosphere, …
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Foraging Behavior and Success of Herons and Egrets in Natural and Artificial Wetlands
… has approximately 13.2 million hectares of wetland habitat, but these sensitive areas are subject to loss and degradation from draining and development. The effects, both positive and negative, that manipulation of these wetlands have on wildlife is still under study. In particular, there is a …
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Responses to lead in the freshwater isopods Asellus Aquaticus and A. Meridianus
… of the environment caused by human activities and much research and debate has centred on this subject in recent years. Current and Increasing concern is focused on the release of heavy metals into the environment.<br/><br/>In aquatic environments, the concentrations of heavy metals are …
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The use of joint probability analysis to predict flood frequency in estuaries and tidal rivers
… the combined influence of river flow, tide and surge on the frequency of extreme water levels in tidal rivers and estuaries. The estimation of flood risk may depend on extreme combinations of these variables rather than individual extreme events, but these relationships are complex and …
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Stable isotope evidence for British Iron Age diet. Inter- and intra-site variation in carbon and nitrogen from bone collagen at Wetwang in East Yorkshire and sites in East Lothian, Hampshire and Cornwall.
… of Iron Age diet in Britain using carbon and nitrogen stable isotope data obtained from skeletal material from four locations across England and southern Scotland. Both human and animal bone Collagen has been analysed from Wetwang in East Yorkshire and other sites in East Lothian, …
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Sea surface distribution of nitrous oxide and methane in European shelf seas and the Atlantic Ocean
… activities, including intensive agriculture and fertiliser use, are altering the radiative forcing on the planet by increasing the amount of the climatically active gases, nitrous oxide (N2O) and methane (CH4), in the troposphere. There are currently uncertainties in quantifying the natural …
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Occurrence of Pharmaceuticals and Personal Care Products (PPCP) & Artificial Sweeteners (AS) in Surface Waters of Maryland's Chesapeake Bay Western Shore
… States, nutrient, personal care products (PPCP) and artificial sweeteners (AS) pollution in lakes, rivers, and estuaries is a problem that has been recognized for decades and is of special concern for many in coastal Maryland. PPCP are used on a daily basis, and include prescription analgesics, …
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Microplastic ingestion by two estuarine-associated mullet species, Chelon richardsonii and Chelon dumerili in the Breede Estuary, South Africa
… multitude of damaging effects to both organisms and the environment. Microplastics (MPs) are defined as solid plastic particles ≤ 5mm in size. The small size of MPs makes them extremely hazardous, as they imitate a range of food items on which organisms feed. Rivers and estuaries are links …
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Human Adenoviruses As Indicators Of Faecal Contamination And Pathogen Indices In The Environment And Shellfish
… of human enteric viruses in the environment and shellfish. The second aim was to consider human polyomaviruses (HPyVs) for the same roles. To gain a better understanding of the ecology of HAdV, their diversity in the environment was also investigated. Method development included validation of …
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Potencial energético de las corrientes generadas por las mareas en las desembocaduras de los ríos y estuarios. Aplicación a la ría de Avilés
… dirigen la financiación hacia este campo cuando se demuestra su viabilidad; convirtiéndose la simulación numérica en una herramienta previa para la predicción de la rentabilidad energética en un área marina. En la presente tesis se aborda el estudio de una de las fuentes de la energía …
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Modelling the morphodynamics of tidal channels
… present study deals with the morphodynamics of rivers and estuaries. The morphodynamic behaviour of natural systems has been investigated using numerical tools. As a first step the hydrodynamics and morphodynamics of both convergent and non-convergent tidal channels have been studied. The …
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Invertebrate Egg and Plant Seed Banks in Natural, Restored, and Drained Wetlands in the Prairie Pothole Region (USA) and Potential Effects of Sedimentation On Recolonization of Hydrophytes and Aquatic Invertebrates
<p>Sediment is the major pollutant of wetlands, lakes, rivers, and estuaries in the United States and it poses unique threats to wetlands of the Prairie Pothole Region (PPR). Sediment may impact the success of wetland restorations because burial of invertebrate and plant propagules may impact …
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Adsorption–Desorption Reactions in the Weathering Zone: Implications for Silicate Weathering & the Carbon Cycle
… The tectonic processes of uplift, exhumation, and erosion modulate the negative feedback relationship between climate, silicate weathering rates, and atmospheric CO2 removal rates by controlling the exposure rate of unweathered minerals at the Earth's surface. However, the extent of this …
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Factors influencing the abundance, community composition and activity states of bacterioplankton from the tidal freshwater James River
… in abundance, shifts in community composition and variable activity states. In the tidal-freshwater James River, variation in bacterial abundance was linked to nutrient availability and autochthonous production with highest bacterial densities associated with low-nutrient, high-chlorophyll a …