This book represents the proceedings of the first ?Great Lakes Costal Wetlands Colloquium? (November 5-7, 1984; East Lansing, Michigan). The theme was ?Natural and Manipulated Water Levels in Great Lakes Wetlands.? This material constitutes both Great Lakes wetlands and the state of understanding about them. It is intended to provide fisheries and wildlife biologists, ecologists, aquatic resource managers and planners and environmental scientists information about the coastal wetlands in regard to eight priority areas. The colloquium and publication of the proceedings were cosponsored by Sea Grant Program and Environment Canada.