Effects of Destratification on Sediment Chemistry and Benthic Macroinvertebrates in Ham's Lake

摘要

Ham's Lake built in 1965 near Stillwater, Oklahoma, was artificially destratified by mechanical pumping and sampling was conducted to determine changes in physiochemical conditions, sediments and heavy metals, and physiological conditions in Chamoborus punctipennis (phanom midge) and Chironomus riparius (bloodworm). Hypolimnetic water parameters tested include: temperature, dissolved oxygen, conductivity, pH, alkalinity, iron, manganese, copper, zinc, sodium, potassium, and chloride. Sediment parameters tested include particle size, organic carbon, phosphorus, clay mineral composition, pH, iron, manganese, zinc, caloric content, and oxygen uptake. The macroinvertebrates Chaoborus and Chironomus were tested for concentrations of iron, manganese, and zinc; caloric content; hemolymph ion concentration; osmotic pressure; and oxygen uptake. Results show that dissolved oxygen was 3 to 5 mg/l higher in the mixed area and temperature was 6 to 8 C higher in the mixed area.