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Full-Text Articles in Physical Sciences and Mathematics
Documenting The History Of Oxygen Depletion In Lake St. Croix, Minnesota, Using Chironomidae Remains In The Sedimentary Record, Caitlin E. Stewart
Documenting The History Of Oxygen Depletion In Lake St. Croix, Minnesota, Using Chironomidae Remains In The Sedimentary Record, Caitlin E. Stewart
Masters Theses 1911 - February 2014
Lake St. Croix is a natural impoundment located at the southern end of the St. Croix River. Land use changes since European settlement (c. 1850) have resulted in nutrient runoff, eutrophication, and periodic oxygen depletion in the hypolimnion of Lake St. Croix. Establishing sound lake management practices requires knowledge of historical conditions obtained through paleoecological studies. Remains of non-biting midges (Insecta: Diptera Chironomidae) in lake sediments have been shown to be reliable indicators of past hypolimnetic oxygen conditions. Cores from two sub-basins in the lake were collected in 2006. Midge analysis indicated that shifts in species assemblages correspond to the …
Geography Of Pestecide Exposure In The Lower Valley (El Paso County, Texas), Critina Solis Sanchez
Geography Of Pestecide Exposure In The Lower Valley (El Paso County, Texas), Critina Solis Sanchez
Open Access Theses & Dissertations
Previous studies using GIS have been used to understand the demographics of particular areas of a city and the risks associated with living there. In the Lower Valley (Socorro, Clint, and San Elizario) area of El Paso County (TX), there has been a rapid growth in population. This increase in growth has led to this project about the types of pesticides used in farms and if they are creating possible health risks for people living in this area and which populations are most at risk. To determine population risk, I use existing GIS information, specifically a USDA aerial photograph taken …