In 1978 Canada and the United States concluded an agreement for the protection and enhancement of water quality in the Great Lakes based on the ecosystem approach to management. Since ratification of this agreement, little progress has been made in practical application of this concept to basin-wide management for the Great Lakes. At the same time public concern for the quality of the Great Lakes and their future has risen dramatically. As a result, the need has arisen for a practical, authoritative explanation of the ecosystem concept. This volume, written by highly qualified authorities, addresses these important ecological, political, and economic issues in a systematic and informative manner. In this study, the ecosystem concept and its objectives are defined. The institutional structure that has evolved for governance of the Great Lakes, the need for a more effective governance structure, and prospects for rehabilitation of the Great Lakes Waters are crucial issues considered. The management question is the single most important policy question with respect to the Great Lakes and this is the only study available that brings together all pertinent information and provides steps for new and constructive management of the Great Lakes.

Sediments are increasingly recognized as both a carrier and a possible source of contaminants in aquatic systems, and they may also affect groundwater quality and agricultural products when disposed on land. Four aspects are covered reflecting the development of knowledge in particle-associated pollutants during the past twenty-five years: - the identification, surveillance, monitoring and control of sources and distribution of pollutants, - the evaluation of solid/solution relations of contaminants in surface waters, - the study of in-situ processes and mechanisms of pollutant transfer in various compartments of the aquatic ecosystems, - the assessment of the environmental impact of particle-bound contaminants, i.e. the development of sediment quality criteria. A final chapter focusses on practical aspects concerning contaminated sediments.

Proceedings of the NATO Advanced Research Workshop, Vilamoura, Portugal, April 24-30, 1985

This is a compilation of 47 methods of modifying habitat to benefit the Great Lakes ecosystem. The information is intended to raise awareness of Canada-US progress toward restoration objectives in the Great Lakes, and describes methods for rehabilitating, restoring, enhancing, mitigating or preserving habitat. For each project the following information is provided: project title, contact information, agencies involved, restoration goal, project type, background and rationale, regulatory considerations, criteria, project design, implementation, degree of environmental intervention, costs, biological assessment, measures of success, and key references.