The Penetration of Light and the Concentration of Dissolved Oxygen in Fertilized Pond Waters Infested with Microcystis
Weekly measurements were made of light intensity, dissolved oxygen concentration, and water temperature at selected depths in five earthen experimental ponds. Measurements were made on a given pond on the same day between 7:00 a.m. and 8:45 a.m. and again between 10:00 a.m. and 11 :45 a.m. The depth at which the average light intensity, as measured with submersible Weston Photronic photoelectric cells, was less than 1 per cent incident radiation varied from 2.5 to 7.5 feet among the ponds, depending on the degree of Microcystis infestation. Generally, at depths where the average light...
