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Theses/Dissertations

2012

Discipline
Institution
Keyword
Publication

Articles 421 - 423 of 423

Full-Text Articles in Environmental Sciences

An Analysis Of Agricultural Land-Use Effects On Surface Water Quality In Skagit County Streams, Marysutton Carruthers Jan 2012

An Analysis Of Agricultural Land-Use Effects On Surface Water Quality In Skagit County Streams, Marysutton Carruthers

WWU Graduate School Collection

Nonpoint source pollution is a concern in many streams nationwide. Puget Sound cleanup efforts have increasingly focused on targeting nonpoint sources of pollution, including nutrient and bacterial sources resulting from agricultural activities. Skagit County, Washington hosts a robust compilation of agricultural activities from large scale row crops and dairy operations to small hobby farms. It is also home to the Skagit River, the most important river system for Puget Sound salmon, and Samish Bay, the largest shellfish growing area in the north Puget Sound. Enormous efforts have been made to assess the health of Washington's waterways and to find an …

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Salmon In The Trees: An Assessment Of A Dendrochemical Technique For Detecting Marine-Derived Nitrogen In Riparian Tree Rings, Jody Gerdts Jan 2012

Salmon In The Trees: An Assessment Of A Dendrochemical Technique For Detecting Marine-Derived Nitrogen In Riparian Tree Rings, Jody Gerdts

WWU Graduate School Collection

Quantifying the relationship between salmon escapement and riparian tree-ring δ15N could contribute greatly to understanding trends in historic salmon abundance. Such an understanding could have far-reaching consequences for understanding historic carrying capacities of river systems and help guide future restoration efforts. This study investigates the reliability of using naturally occurring isotopic variations in annual tree rings to produce quantifiable estimates of historic salmon runs. Three study areas with temporal and spatial changes in salmon spawning abundance were examined. I found that currently available techniques for removing mobile nitrogen are not sufficient to overcome problems associated with radial mobility, as indicated …

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Modeling Potential Impacts Of Heavy Metals And Btex Compounds From The Former Year-A-Round Cab Company On Hiniker Pond, Jason Nolan Jan 2012

Modeling Potential Impacts Of Heavy Metals And Btex Compounds From The Former Year-A-Round Cab Company On Hiniker Pond, Jason Nolan

All Graduate Theses, Dissertations, and Other Capstone Projects

The Year-A-Round Cab Company (an industrial metal preparation, painting, and welding facility) in Mankato, MN has a history of numerous environmental violations. The site is located 300 yards north of Hiniker Pond, a popular swimming spot. The primary purposes of my research were to determine if BTEX (ethyl benzene, toluene, and xylenes) and heavy metals had reached Hiniker Pond, and model estimated contaminate plumes from the Year-A-Round Cab Company. Lead, cadmium, and chromium were found in sediments at levels of up to 30 times higher near the site as compared to the control lake, Hallett's Pond. Although BTEX were not …

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