For more than a century, a large volume of gold-mining tailings was deposited in Whitewood Creek and the Belle Fourche River, tributaries to the Cheyenne River in western South Dakota. Much of it still remains, and field and historical evidence indicates continued remobilization…
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Scope and methods of study. (1) Scale effects on phosphorus (P) loss and runoff depth from pastures were investigated by summarizing water quality data from 19 research projects. Spatial (area) and temporal (days after litter application) scales ranged from 0.5 to 80000 m2 and 1…
Excessive delivery of fine sediment 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,…
Inland waters play an important role in the transport, transformation, loss and storage of carbon (C) and nitrogen (N) in the pathway between terrestrial and marine systems. Inland waters can act as both sources to the atmosphere through evasion of GHGs such as CO2, CH4 and N2O,…
This thesis presents an independent, sediment-based record of landscape change within an agricultural hinterland. Established historical and archaeological sequences document the primary occupation of Anuradhapura, Sri Lanka’s ancient capital, beginning ca. 400 BC and lasting un…
Selenium (Se) is a trace element of great ecological importance whose environmental distribution is highly impacted by anthropogenic activity. In the 1980s, selenium was recognized as a major aquatic contaminant following widespread deformities and mortality among waterfowl hatc…
In order to address how aquaculture has influenced the Setiu estuary and lagoon of northeast peninsular Malaysia, foraminifera, sediment grain-size, and carbon and nitrogen isotope ratios and abundances were analyzed in surface samples collected from beneath and around three flo…
Metal processing has played a key role in the history of the Quad Cities and more broadly, the upper Midwest. In addition to economic prosperity, the legacy of those activities has included sources of soil and water pollution that are often not immediately apparent. One example …
The production and export of methylmercury (MeHg) is a critical first step to accumulation of mercury (Hg) in the lower food web and subsequent magnification in game fish. The purpose of this thesis was to identify areas of MeHg production and export in a freshwater estuary with…
Nitrate is the most common limiting nutrient in the ocean and plays a critical role in the extent and intensity of marine primary production, and therefore the global ocean’s biological pump. Characterization of the supply and demand of nitrate constrains how ocean biology may r…
Glaciers are an integral part of polar and alpine landscapes, providing water, inorganic, and organic material subsidies to downstream ecosystems. These subsides regulate downstream temperature, streamflow, and sediment supplies. Warming in high altitude and high latitude enviro…