Preface. 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 Andre 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 contents of organisms -- A case study; J.C. Fonseca, et al. Trophic status based on nutrient concentration scales and primary producers community of tropical coastal lagoons influenced by groundwater discharges; J.A. Herrera-Silveira, et al. "Ferry-Boxes" and data stations for the improved monitoring and resolution of eutrophication related processes: application in Southampton Water UK, a temperate latitude hypernutrified estuary; S.E. Holley, D.J. Hydes. Identifying "hot spots" of biological and anthropogenic activity in two Irish estuaries using means and frequencies; M.P. Johnson, et al. Distribution patterns of nutrients and symptoms of eutrophication in the Rio de la Plata River Estuary System; G.J. Nagy, et al. Baseline study of soft bottom benthic assemblages in the Bay of Santander (Gulf of Biscay); A. Puente, et al. Chemical fluxes between and within ecosystems. Nutrient (N, P, Si) fluxes between marine sediments and water column in coastal and open Adriatic; A. Baric, et al. Nitrogen fluxes and budget seasonality in the Ria Vigo (NW Iberian Peninsula); R. Prego. The winter and summer partitioning of dissolved nitrogen and phosphorus. Observations across the Irish Sea during 1997 en 1998; T.M. Shammon, R.G. Hartnoll. Long-term changes in Wadden Sea nutrient cycles: importance of organic matter import from the North Sea; J.E.E. van Beusekom, V.N. de Jonge. Particulate inputs to Dublin Bay and to the South Lagoon, Bull Island; J.G. Wilson, et al. Modelling of estuaries and coastal waters. A model for predicting the temporal evolution of dissolved oxygen concentration in shallow estuaries; A. Garcia, et al. Modelling the faecal coliform concentrations in the Bilbao estuary; J.M. Garcia-Barcina, et al. Simulating vertical water mixing in homogeneous estuaries: the Sado estuary case; F. Martins, et al. Mathematical modelling as a management tool for water quality control of the tropical Beberibe estuary, NE Brazil; C.H.A. Ribeiro, M. Araujo. The prediction of nutrients into estuaries and their subsequent behaviour: application to the Tamar and comparison with the Tweed, UK; R.J. Uncles, et al. Pelagic and benthic metabolism and trophic pathways. Seasonal change in the proportion of bacterial and phytoplankton production along a salinity gradient in a shallow estuary; M.A. Almeida, et al. The planktonic food web structure of a temperate zone estuary, and its alteration due to eutrophication; G.M. Capriulo, et al. The feeding strategy of the dunlin (Calidris alpina L.) in artificial and non-artificial habitats at Ria de Aveiro, Portugal; A. Luis, et al. Short-term variations in the physiological state of phytoplankton in a shallow temperate estuary; I. Madariaga. Evidence of a planktonic food web response to changes in nutrient input dynamics in the Mar Menor coastal lagoon, Spain; A. Perez-Ruzafa, et al. Management and restoration of coastal systems. Some ecological properties in relation to eutrophication in the Baltic Sea; E. Bondsdorff, et al. Evaluation of the nutrient inputs to a coastal lagoon: the case of the Ria de Aveiro, Portugal; J. Figueiredo da Silva, et al. Evaluation of a eutrophic coastal lagoon ecosystem from the study of bottom sediments; F. Frascari, et al. Consequences of point and non-point source phosphorous loads on Thau coastal lagoon water quality over 25 years (Mediterranean Sea, France); I. La Jeunesse, J.M. Deslous-Paoli. Nutrients related to the hydrologic regime in the coastal lagoons of Viladecans (NE Spain); J.R. Lucena, et al. Filling of a wetland (Seine estuary, France): natural eutrophication or anthropogenic process? A sedimentological and geochemical study of wetland organic sediments; V. Mesnage, et al. Response of pelagic and benthic organisms to eutrophication. The effects of macroalgal cover on the spatial distribution of macrobenthic invertebrates: the effect of macroalgal morphology; S.G. Bolam, T.F. Fernandes. Importance of discards of the beam trawl fishery as input of organic matter into nursery areas within the Tagus estuary; H.N. Cabral, et al. The intertidal soft-bottom infaunal macrobenthos in three Basque estuaries (Gulf of Biscay): a feeding guild approach; L. Garcia-Arberas, A. Rallo. "In vitro" and "in situ" decomposition of nuisance macroalgae Cladophora glomerata and Pilayella littoralis; T. Paalme, et al. Late holocene pollution in the Gernika estuary (southern Bay of Biscay) evidenced by the study of Foraminifera and Ostracoda; A. Pascual, et al. Planktonic chlorophyll a and eutrophication in two mediterranean littoral systems (Mallorca Island, Spain); M. Puigserver, et al. Physiological response of Spisula Subtruncata (da Costa, 1778) to different seston quantity and quality; J.L. Rueda, A.C. Smaal. Management issues. The management of nutrients and potential eutrophication in estuaries and other restricted water bodies; M. Elliott, V.N. de Jonge.