Foreword. Hutchinson's heritage: the diversity-disturbance relationship in phytoplankton; U. Sommer, J. Padisak, C.S. Reynolds, P. Juhasz-Nagy. Disturbance events affecting phytoplankton biomass, composition and species diversity in a shallow, eutrophic, temperate lake; B.A. Jacobsen, P. Simonsen. Stress and disturbance in the phytoplankton community of a shallow hypertrophic lake; K. Olrik, A. Nauwerck. Diversity and succession of the phytoplankton in a small lake over a two-year period; P. Eloranta. Phytoplankton succession and diversity in a warm monomictic, relatively shallow lake: Lake Volvi, Macedonia, Greece; M. Moustaka-Gouni. Hypertrophic phytoplankton and the Intermediate Disturbance Hypothesis; C. Rojo, M. Alvarez-Cobelas. Disturbance-diversity relationships in two lakes of similar nutrient chemistry but contrasting disturbance regimes; U. Sommer. Importance of intermediate disturbances for species composition and diversity of phytoplankton in two very different Berlin lakes; I. Chorus, G. Schlag. Seasonal succession of phytoplankton and its diversity in two highly eutrophic lakes with different conditions of stratification; I. Trifonova. Seasonal fluctuations in the diversity and compositional stability of phytoplankton communities in small lakes in upper Bavaria; R. Holzmann. Ecology of the phytoplankton of the River Moselle: effects of disturbances on community structure and diversity; J.-P. Descy. Some notes about the Intermediate Disturbance Hypothesis and its effects on the phytoplankton of the middle Orinoco river; H.I. Carvayal-Chitty. Effects of the water discharge on periphyton abundance and diversity in a large river (River Danube, Hungary); E. Acs, K.T. Kiss. The influence of different disturbance frequencies on the species richness, diversityand equitability of phytoplankton in shallow lakes; J. Padisak. Scales of disturbance and their role in plankton ecology; C.S. Reynolds. Notes on compositional diversity; P. Juhasz-Nagy. Intermediate disturbance in the ecology of phytoplankton and the maintenance of species diversity: a synthesis; C.S. Reynolds, U. Sommer, J. Padisak. General index.