Preface. I: Factors Determining Biogeography and Distribution. The Distribution and Ecology of the Fresh and Brackish Water Medusae of the World; H.J. Dumont. The Temperate-Tropical Gradient of Planktonic Protozoa and Rotifera; J. Green. On the Diversity of the Cladocera in the Tropics; H.J. Dumont. Distribution Patterns of the Diaptomidae (Calanoida: Copepoda) in Southern Africa; N.A. Rayner, J. Heeg. Temperature-Related Distributions of Metadiaptomus and Tropodiaptomus (Copepoda: Calanoida), particularly in Southern Africa; R.C. Hart, N.A. Rayner. Rotifers of Benin River, Nigeria; C.C. Onwudinjo, A.B.M. Egborge. Salinity and the Distribution of Rotifers in the Lagos Harbour--Badagry Creek System, Nigeria; A.B.M. Egborge. Zooplankton, Fish and Fisheries in Tropical Freshwaters; C.H. Fernando. II: Autoecological Studies. Growth, Production, and Demography of Moina micrura in Brackish Tropical Fishponds (Layo, Ivory Coast); L. Saint-Jean, C.A. Bonou. In situ Metabolic Budget for the Calanoid Copepod Acartia clausi in a Tropical Brackish Water Lagoon (Ebria Lagoon, Ivory Coast); M. Pagano, L. Saint-Jean. Equiproportional Temperature-Duration Responses and Thermal Influences on Distribution and Species Switching in the Copepods Metadiaptomus meridianus and Tropodiaptomus spectabilis; R.C. Hart. Duration of Development and Production Estimates for Two Crustacean Zooplankton Species, Thermocyclops oblongatus Sars (Copepoda), and Diaphanosoma excisum Sars (Cladocera), in Lake Naivasha, Kenya; K.M. Mavuti. III: Community Ecology. Relative Significance of Direct and Indirect Effects of Predation by Planktivorous Fish on Zooplankton; Z.M. Gliwicz. Seasonal Trends in Zooplankton Densities in Samyati Basin, Lake Kariba: Multivariate Analysis; H.M. Masundire. Mean Individual Dry Weight and Length-Weight Regressions of Some Zooplankton of Lake Kariba; H.M. Masundire. Chlorophyll Budget in a Productive Tropical Pond: Algal Production, Sedimentation, and Grazing by Microzooplankton and Rotifers; R. Arfi, D. Guiral. Comparative Limnology, Species Diversity and Biomass Relationships of Zooplankton and Phytoplankton in Five Freshwater Lakes in Kenya; J.N. Uku, K.M. Mavuti. Changes in Relative Abundance of Zooplankton in Northern Lake Victoria, East Africa; L. Mwebaza-Ndawula. Zooplankton Composition and Abundance in Two Impoundments in Zimbabwe; P.F.M. Ellenbaas, C. Grundel. Evaluation of Eutrophication Control in Lake Chivero, Zimbabwe, by Multivariate Analysis of Zooplankton; C.H.D. Magadza.