The First International Lake Ladoga Symposium : Proceedings of the First International Lake Ladoga Symposium: Ecological Problems of Lake Ladoga, St. Petersburg, Russia, 22–26 November 1993

Lake Ladoga is the largest lake in Europe and, with its surface of 17,891 km 2 and volume of 837 km 3 , it ranks among the top fifteen of the world's freshwater bodies. The ecological condition of Lake Ladoga is of concern to several million people living in its surroundings. There is evidence of water quality degradation and gradual eutrophication of the lake during the past decades; on the other hand, pollution control measures have improved the situation in many of the most polluted sites near industrial effluent sources. The first international Lake Ladoga Symposium was held in St. Petersburg on 22-26 November, 1993. The symposium was attended by 160 scientists, and about half of the papers presented at the symposium have been edited for this book. The contributions are grouped under the following headings: Present state of Lake Ladoga; Hydrodynamics of Lake Ladoga and other large water bodies; Water quality and pollution; Ecological studies of Lake Ladoga biota; History of Lake Ladoga and rates of change in its environment; Research methods for large lakes. Besides providing up-to-date information on the state of the lake, the papers deal with studies of many other large lakes of the cold-temperature zone and the general problems and methods of large lake research. Furthermore, the book is a valuable source of reference to the voluminous Russian limnological literature. Front Matter....Pages i-xi Ecological problems of Lake Ladoga: causes and solutions....Pages 1-7 The trophic state of Lake Ladoga as indicated by late summer phytoplankton....Pages 9-16 Bacterioplankton response to eutrophication in Lake Ladoga....Pages 17-22 Bottom sediments and biocoenoses of northern Ladoga and their changes under human impact....Pages 23-28 Meiofauna of the profundal zone of the northern part of Lake Ladoga as an indicator of pollution....Pages 29-38 Littoral zone of Lake Ladoga: ecological state evaluation....Pages 39-47 Invertebrate communities associated with macrophytes in Lake Ladoga: effects of environmental factors....Pages 49-55 Fishery of Lake Ladoga — past, present and future....Pages 57-64 New morphometrical data of Lake Ladoga....Pages 65-67 Main features of the thermal regime of Lake Ladoga during the ice-free period....Pages 69-73 Numerical modelling of large-scale circulation in Lakes Onega and Ladoga....Pages 75-80 Density structure of the fine surface water layer of large lakes and remote measurement of the temperature....Pages 81-84 Physical limnological processes under ice....Pages 85-90 Mixing in ice-covered lakes....Pages 91-97 The influence of seasonal and year-to-year variability of water discharge from the Lake Ladoga—Neva River system on the salinity regime of the Baltic Sea....Pages 99-102 The estimation of current state of Lake Ladoga using mathematical models....Pages 103-108 Particle pathways of Niagara river water in Lake Ontario affecting bottom sediment contamination....Pages 109-116 Water currents and spreading of river load in Lake Pyhäselkä, Saimaa, Finland....Pages 117-124 Joint Russian—Finnish study of radioactive contamination in the NW part of Lake Ladoga....Pages 125-127 Distribution and release of sedimentary phosphorus in Lake Ladoga....Pages 129-136 Ecologic and hygienic evaluation of Lake Ladoga as a source of drinking water....Pages 137-141 Lake Ladoga: chemical pollution and biochemical self-purification....Pages 143-147 A survey of toxicity of cyanobacterial blooms in Lake Ladoga and adjacent water bodies....Pages 149-151 Mathematical model for the ecosystem response of Lake Ladoga to phosphorus loading....Pages 153-157 The impact of effluents of Pitkäranta pulp mill on the water quality of Lake Ladoga: a model study....Pages 159-166 Protein indication method in monitoring of pulp mill effluent pollution in Lake Ladoga....Pages 167-171 Zooplankton characteristics in monitoring of Lake Ladoga....Pages 173-179 Species composition of planktonic Rotifera, Cladocera and Copepoda in the littoral zone of Lake Ladoga....Pages 181-185 Establishment of the Baikalian endemic amphipod Gmelinoides fasciatus Stebb. in Lake Ladoga....Pages 187-192 The Ladoga seal ( Phoca hispida ladogensis Nordq.)....Pages 193-198 Late- and postglacial history of lakes of the Karelian Isthmus....Pages 199-204 Shoreline displacement of Lake Ladoga — new data from Kilpolansaari....Pages 205-215 Lake Ladoga Region: human impacts and recent environmental changes....Pages 217-221 Atmospheric deposition of sulphur, nitrogen and base cations in Scots pine stands of south-eastern Finland and the Karelian Isthmus, NW Russia in 1992....Pages 223-226 Combined application of remote sensing and in situ measurements in monitoring environmental processes....Pages 227-232 Combined use of spectral brightness and polarization characteristics of upward radiation in remote sensing of inland waterbodies....Pages 233-236 Mathematical modelling of runoff and material transport from drainage areas into recipient water bodies....Pages 237-240 Water chemistry of Lake Ladoga and Russian-Finnish intercalibration of analyses....Pages 241-248 Comparison of methods used in zooplankton sampling and counting in the joint Russian-Finnish evaluation of the trophic state of Lake Ladoga....Pages 249-253 Phytoplankton composition and pigment concentrations as indicators of water quality in the Rybinsk reservoir....Pages 255-259 The relationship between fish yield and primary production in large European freshwater lakes....Pages 261-266 Spatial patterns and relationships between phytoplankton, zooplankton and water quality in the Saimaa lake system, Finland....Pages 267-276 Structural phase diagrams of animal communities in assessment of freshwater ecosystem conditions....Pages 277-282 Palaeolimnological analyses as information source for large lake biomonitoring....Pages 283-292 Comparison of sampling methods for semipelagic animals in two deep basins of Lake Saimaa....Pages 293-300 Sample size in the monitoring of benthic macrofauna in the profundal of lakes: evaluation of the precision of estimates....Pages 301-315 Back Matter....Pages 317-328