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Obituary: Edward Smith Deevey (1914-1988).- Palaeolimnology in the English Lakes - some questions and answers over fifty years.- Accuracy and precision in sediment chronology.- 241Am dating of lake sediments.- Accuracies in Po-210 determination for lead-210 dating.- How long was the Younger Dryas? Preliminary evidence from annually laminated sediments of Soppensee (Switzerland).- Absolute dating of late Quaternary Lacustrine sediments by high resolution varve chronology.- The record of deposition of radionuclides in the sediments of Ponsonby Tarn, Cumbria.- Deposition and transport of radionuclides within an upland drainage basin in mid-Wales.- Progress in understanding the chemical stratigraphy of metals in lake sediments in relation to acidic precipitation.- Spheroidal carbonaceous particles as a marker for recent sediment distribution.- Magnetic spherules in recent lake sediments.- Lake sediment records of erosional processes.- A multidisciplinary study of the lake Bjäresjösjön (S Sweden): land-use history, soil erosion, lake trophy and lake-level fluctuations during the last 3000 years.- Paleolimnology of Slapton Ley, Devon, UK.- Sequential inorganic chemical analysis of a core from Slapton Ley, Devon, UK.- Sediment characteristics in relation to cultivation history in two varved lake sediments from East Finland.- The influence of land use on the sedimentation of the river delta in the Kyrönjoki drainage basin.- Heavy metals (Cu and Zn) in recent sediments of Llangorse Lake, Wales: non-ferrous smelting, Napoleon and the price of wheat - a palaeoecological study.- A comparative study of heavy metal contamination and pollution in four Reservoirs in the English Midlands, UK.- Sedimentary diatom concentrations and accumulation rates as predictors of lake trophic state.- The sediment column as a record of trophic status: examples from Bosherston Lakes, SW Wales.- Recent changes to upland tarns in the English Lake District.- Palaeolimnological study of an environmental monitoring area, or, Are there pristine lakes in Finland?.- The eutrophication history of Lake Särkinen, Finland and the effects of lake aeration.- Are we building enough bridges between paleolimnology and aquatic ecology?.- Weichselian chironomid and cladoceran assemblages from maar lakes.- Stratigraphy of the fossil Chironomidae (Diptera) from Lake Grasmere, South Island, New Zealand, during the last 6000 years.- Modern assemblages of arctic and alpine Chironomidae as analogues for late-glacial communities.- Paleolimnology of Neusiedlersee, Austria: the succession of ostracods.- Palaeolimnology of Neusiedlersee - II: the distribution of nutrients and trace metals.- Paleolimnological investigation of three manipulated lakes from Sudbury, Canada.- Dominant diatoms in the interglacial lake sediments of the Middle Pleistocene in Central and Eastern Poland.- Fossil diatom inferred reconstruction of the pH history of two acidic, clear water lakes from insular Newfoundland, Canada.- Taphonomy and diagenesis in diatom assemblages; a Late Pleistocene palaeoecological study from Lake Magadi, Kenya.- Palaeolimnological aspects of a Late-Glacial shallow lake in Sandy Flanders, Belgium.- Palaeolimnological studies of laminated sediments from the Shropshire-Cheshire meres.- Paleolimnological studies using sequential lipid extraction from recent lacustrine sediment: recognition of source organisms from biomarkers.- Vegetation change and pollen recruitment in a lowland lake catchment: Groby Pool, Leics (England).- Seasonal changes in sedimenting material collected by high aspect ratio sediment traps operated in a holomictic eutrophic lake.- Paleolimnology of a Polar Oasis, Truelove Lowland, Devon Island, N.W.T., Canada.- An environmental history of two freshwater lakes in the Larsemann Hills, Antarctica.- Paleolimnology of Qilu Hu, Yunnan Province, China.- Sedimentary features and the evolution of lake Honghu, central China.- Palaeolakes of the south central Sahara - probl

`Jellyfish', a group that includes scyphomedusae, hydromedusae, siphonophores and ctenophores, are important zooplankton predators throughout the world's estuaries and oceans. These beautiful creatures have come to public attention as featured exhibits in aquaria and in news headlines as invaders and as providers of genes used in biomedical research. Nevertheless, jellyfish are generally considered to be nuisances because they interfere with human activities by stinging swimmers, clogging power plant intakes and nets of fishermen and fish farms, and competing with fish and eating fish eggs and larvae. There is concern that environmental changes such as global warming, eutrophication, and over-fishing may result in increased jellyfish populations. The literature reviews and research papers in this volume explore the interactions between jellyfish and humans. Papers cover the medical aspects of jellyfish stings, jellyfish as human food and jellyfish fisheries, interactions of jellyfish and fish, effects of environmental changes on jellyfish, effects of introduced ctenophores on the Black Sea ecosystem, factors causing increases or concentrations of jellyfish, and others aspects of jellyfish ecology. This is an important reference for students and professional marine biologists, oceanographers, fishery scientists, and aquarists.

Proceedings of the Fourth International Symposium

Proceedings of the Symposium on Perspectives in Southern Hemisphere Limnology held in Wilderness, South Africa, 3-13 July 1984

This volume originated in a belief, shared by the two editors, that the time was ripe for a world-wide survey - or at least sampling - of seasonality in freshwater phytoplankton. Thus one may expect to find the geographical differentiation of climatic patterns reflected in the seasonal patterns of algal occurrence.

Proceedings of the Fourth International Symposium on the Turbellaria held at Fredericton, New Brunswick, Canada, August 5-10, 1984

Proceedings of the Second International Meeting on Nemertean Biology, Tjarnoe Marine Biology Laboratory, August 11-15, 1986

Proceedings of the Twelfth International Seaweed Symposium, held in Sao Paulo, Brazil, July 27-August, 1986.

Proceedings of the Fourth International Rotifer Symposium Held in Edinburgh, Scotland, August 18-25, 1985

Proceedings of an International Workshop Held in Aberystwyth, Wales, 1984

Proceedings of a Symposium held in Brussels, Belgium, December 9-12, 1985

Proceedings of the Cladocera Symposium, Budapest 1985

Proceedings of a symposium held in Uppsala, Sweden, September 25-28, 1985

On behalf of the participants we express our thanks for the generous sponsorship received from the Maj and Tor Nessling Foundation, the Academy of Finland, the Finnish Ministry of Education, Lammi Biological Station and the Finnish Limnological Society.