hydrobiologia volume 213, contents No. 1 P. G. Sly: The effects of land use and cultural development on the Lake Ontario ecosystem since 1750 No. 2 P. S. Joseph, M. Arar & I. Shalash: Coastal environmental impacts on Kuwaiti fisheries P. V. McCormick, E. P. Smith & J. Cairns, Jr.: The relative importance of population versus community processes in microbial primary succession A. N. Economou, Ch. Daoulas & P. Economidis: Observations on the biology of Leuciscus ‘svallize’ in the Kremasta reservoir (Greece) P. Rodriguez & J. F. Wright: Description and evaluation of a sampling strategy for macroinver- tebrate communities in Basque rivers (Spain) C. Logan, E. A. Trippel & F. W. H. Beamish: Thermal stratification and benthic foraging patterns of white sucker R. Barbieri & F. A. Esteves: The chemical composition of some aquatic macrophyte species and implications for the metabolism of a tropical lacustrine ecosystem — Lobo Reservoir, Sao Paulo, Brazil M. Arunachalam, K. C. M. Nair, J. Vijverberg, K. Kortmulder & H. Suriyanarayanan: Substrate selection and seasonal variation in densities of invertebrates in stream pools of a tropical river H. A. Rhodes & W. A. Hubert: Submerged undercut banks as macroinvertebrate habitat in a subalpine meadow stream C. Callieri, R. Bertoni, C. de Marco & M. Contesini: Settling flux and sinking velocity of Seston in Lago di Mergozzo (Northern Italy) and influence of microbial activity on the decomposition of entrapped organic material No. 3 A. G. Wones & G. L. Larson: The benthic macroinvertebrate community in a coastal sand dune lake relative to habitat and changing lake levels T. Hellstrém: The effect of resuspension on algal production in a shallow lake B. Malmavist, P. Sjéstrém & K. Frick: The diet of two species of /soperia (Plecoptera: Perlodidae) in relation to season, site, and sympatry R. T. James: Microbiology and chemistry of acid lakes in Florida: |. Effects of drought and post- drought conditions R. T. James: Microbiology and chemistry of acid lakes in Florida: Il. Seasonal relationships O. N. Junior, M. R. Dip & R. M. Gées: Macroalgae of a stream in southeastern Brazil: composition, seasonal variation and relation to physical and chemical variables Book reviews