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The Symposium on Shallow Lakes, held from 23rd-30th, September 1979, at the Biological Research Station, IlImitz (Austria), was intended to give an insight into current European research on shallow lakes. The reason for the restriction to European participants was firstly to gather as much information as possible on investigations in one geographic area, and secondly the limited time and space available. Since shallow lakes pose a number of problems specifically related to their depth, several symposia have been devoted to this subject. Meetings like the Symposium on the Limnology of Shallow Waters in Tihany (Hungary), in 1973 and the Symposium 'Flachseeforschung' in Steinhude (Fed. Rep. of Germany), in 1974 stressed the need for further communication amongst limnologists working in this field. Moreover several international projects, like the OECD-Eutrophication-Program and the MaB-Project, have included certain aspects of shallow lake limnology. It is hoped by the editors that the proceedings presented here will stimulate further research and a greater exchange of information in this field.
Sommario
1. Steinhuder Meer, Fed. Rep. of Germany.- Background data.- Some studies on the problem of "Treibmudde" in Steinhuder Meer.- Primary productivity measurements and carbon metabolism in Steinhuder Meer and Lake Dümmer.- Primary productivity, light measurements, and mathematical interpretation.- Fluorometric chlorophyll estimation of various algal populations.- 2. Neusiedlersee, Austria.- Background data.- Phosphorus and nitrogen in Neusiedlersee.- Mechanisms controlling phytoplankton primary production in a turbid shallow lake (Abstract).- Effects of food, predation and competition in the plankton community of a shallow lake (Neusiedlersee, Austria)..- Wastewater treatment and phosphorus loading of Neusiedlersee.- 3. Lake Balaton, Hungary.- Background data.- Physical and chemical microstratifications in the shallow Lake Balaton and their possible biotic and abiotic aspects.- Changes in the structure of phytoplankton in Lake Balaton as a result of eutrophication.- About feeding conditions of bream (Abramis brama L.) in Lake Balaton.- 4. Miscellaneous.- 4.1 Chemical aspects.- Physico-chemical aspects of alkaline ponds in Yugoslavia.- Phosphorus concentration and algal species composition in two eutrophic reservoirs in Southern England.- Farmoor I and II, Southern England: Background data.- 4.2 Botanical aspects.- Seasonal variation of phytoplankton biomass and photosynthesis in the high-mountain Lake La Caldera (Sierra Nevada, Spain).- Phytoplankton in 35 Finnish brown-water lakes of different trophic status.- Impact of the muskrat (Ondatra zibethica L.) on aquatic vegetation in small Finnish lakes.- Effects of the growth of Elodea canadensis Michx. in a shallow lake (Lake Tämnaren, Sweden).- Lake La Caldera, Sierra Nevada, Spain: Background data.- Lake Tämnaren,Sweden: Background data.- 4.3 Bacteriological aspects.- Diurnal variations in the uptake of glucose by attached and free-living microheterotrophs in lake water (Lake Mossø, Denmark).- Physiological adaptation and growth of purple and green sulfur bacteria in a meromictic lake (Vila) as compared to a holomictic lake (Siso).- Field studies on the competition between purple and green sulfur bacteria for available light (Lake Siso, Spain).- Enzymatic activity of bacteria from two lakes of different trophy (Lake Jeziorak and Lake Jasne, Poland).- Lake Mossø, Denmark: Background data.- Lake Vila, Girona, Spain: Background data.- Lake Siso, Girona, Spain: Background data.- 4.4 Zoological aspects.- Composition and variation of the bottom fauna in the sublittoral of the eutrophic Lake Doiran (Macedonia, Yugoslavia).- General index.
