Cyanobacteria (blue-green algae) began to grow in large numbers in lake Washington as a result of the release of effluent from sewage treatment plans. Human activities have a big impact on water quality, but other, more subtle biological processes are also quite important.
An intriguing illustration of how anthropogenic factors and biological processes can change water quality is Lake Washington. The late Dr. W.T. Edmondson, spent many years researching the biology and chemistry of Lake Washington.Between 1941 and 1963, the lake received growing amounts of secondary processed sewage, which led to eutrophication and a decrease in the lake's water quality. From 1955 to 1973, cyanobacteria dominated the planktonic algae community.
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