Management of an undisturbed water ecosystem containing old growth hemlock, as a model system of Clear Lake Reserve, Ontario

Since 1969 Trent University researchers have been investigating the chemistry and biotic part of a small undisturbed lake near Minden, Ontario. Clear Lake is surrounded by old growth hemlock stands, some 400 years old. The research was later joined by personnel of the Ontario Ministry of the Environment, and the educational program in the Frost Centre. We are going to discuss changes in pH, phosphorus content and the reaction of aquatic macrophytes, Eriocaulon and Lobelia dortmana, to simulated acid rain conditions and increased ultraviolet radiation.