This volume focuses on the nutrient and organic matter inputs in estuaries and other coastal ecosystems, their effects on geochemistry and community structure and possibilities for recovery of the systems to a trophic state that is beneficial for man and nature. The book provides many examples of the effects of the enhanced supply of nutrients and organic matter on the chemical features of the water and on the structure, metabolism and trophic pathways of the biological communities. Also included are several case studies providing considerable insight into the response of the different coastal ecosystems to long term changes in the trophic state of the water. Current knowledge on modeling as a tool to manage the trophic state of the coastal ecosystems is also dealt with, making this book one of interests to scientist and students as well as managers.Proceedings of the 31st Symposium of the Estuarine and Coastal Sciences Association (ECSA) held in Bilbao, Spain, 3-7 July 2000Preface. The Estuarine and coastal Sciences Association (ECSA). Introductory paper. Causes, historical development, effects and future challenges of a common environmental problem: eutrophication; V.N. de Jonge, et al. Hydrodynamic control of chemical and biological processes. Modern foraminiferal record of alternating open and restricted environmental conditions in the Santo Andr? lagoon, S.W. Portugal; A. Cearreta, et al. Nutrient inputs to the Irish Sea: temporal and spatial perspectives; K. Kennington, et al. Nutrient-enhanced productivity in the northern Gulf of Mexico: past, present and future; N.N. Rabalais, et al. Potential modification of the fluxes of nitrogen from the Humber estuary catchment (UK) to the North Sea in response to changing agricultural inputs and climate patterns; A.D. Tappin, et al. Methods and approaches to assess and control estuarine and coastal eutrophication. Estimation of ecological energy using weighing parameters determined from DNA ls"