I. Behaviour of chemical species and modelling. Approaches in chemical speciation studies in marine waters (C.J.M. Kramer). River inputs into oceans (W. Michaelis, V. Ittekkot and E.T. Degens). Surface properties of particles at the land-sea boundary (J.-M. Martin, J.-M. Mouchel and J. Jednacak-Biscan). II. Nutrient cycling and pathways of organic transformations. Modelling studies of material flows in a shallow ecosystem compared to the open ocean (J.G. Field, P.A. Wickens and D.L. Moloney). The retention of nutrients (C, N, P), heavy metals (Mn, Cd, Pb, Cu), and petroleum hydrocarbons in Narragansett Bay (S.W. Nixon, C.D. Hunt and B.L. Nowicki). The role of detritus at the land-sea boundary (K.H. Mann). Spatial and temporal distribution of bacterial populations in marine shallow water surface sediments (L.-A. Meyer-Reil). Heat production of microorganisms in eutrophied estuarine systems - An experimental study (P. Lasserre, T. Tournié, M. Bianchi and S. Chamroux). III. Uptake of trace elements by living organisms. Trace metals-phytoplankton interactions: an overview (F.M.M. Morel). Biological availability of trace elements (D.R. Turner). Predictions for the mobility of elements in the estuarine environment (B.R. Folsom and J.M. Wood).