Riley, Michael J.Stefan, Heinz G.2011-08-292011-08-291987-08https://hdl.handle.net/11299/114021Lakes are in a continuous state of change. Some changes occur over very short periods of time on the order of hours and minutes. Other changes mark long-term trends in the biological and physical condition of a lake. Among the long-term trends in many lakes are a decrease in depth and an increasing productivity in a process called eutrophication. Typically, eutrophication occurs over a time scale of centuries. However, man-made changes to the watershed of a lake may result in a rapid acceleration of eutrophication such that significant changes in the water quality of the lake are noticed in a time span of a few years. Anthropogenic acceleration of eutrophication, known as cultural eutrophication, is due to agricultural, urban, and recreational development in the watershed of a lake which causes an increase in the nutrient loading to a lake.en-USReport