This booklet deals with wetlands in the lower Seine valley. A research project was conducted under the umbrella of the "Programme National des Zones Humides" (PNRZH national wetlands programme), associated in this geographical context with the "Seine Aval" programme. The booklet examines two major environmental issues : analysing the structure and functioning of wetlands, with respect to their history and their present biodiversity ; taking a conceptual approach to assessment, conservation, restoration and protection of wetlands in the human context of the lower Seine valley. The relevant scales in time or space for ecological management, the notions of system resilience or "ecosystem of reference" are presented. The issues of both biodiversity and ecosystem functions in wetlands should be taken into account to provide a basis for the sustainable development of the lower Seine valley.
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