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An introduction to the periodical is presented in which the guest editors discusses ecological state of Lake Ontario, New York City and Ontario.

The article presents a research on Lake Superior in the U.S. Lake Superior provides unique opportunities for research because of its size, ultraoligotrophic status and its relatively low density of human population centers and industrial activities. It is the largest lake in the world by surface area and the second largest by volume. The article discusses results of current efforts to reconstruct the paleo-lake levels of the Upper Great Lakes. Investigators interested in the biogeochemistry of ultraoligotrophic freshwater ecosystems have focused their attention on this lake.