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This book tells a story of a large lake affected by agricultural and urban activities that have led to severe eutrophication problems with nuisance blue-green algal blooms. Although it is a case study of Lake Ringsjön (southern Sweden), the background, problems and measures are applicable to many lakes throughout the world. From a limnological point of view, the Lake Ringsjön story began more than 100 years ago, and during the last 20 years the sampling program has been intense, providing a unique data set on how a lake responds to human activities. However, the Lake Ringsjön story is not only a case study, but also a historical record of the development of ecological theory and its application. Hence, the lake has been subject both to an extensive nutrient reduction programme and a biomanipulation by means of fish reduction. Here we aim at combining the unique limnological data set with the eutrophication process, the nutrient reduction programme and the biomanipulation in order to apply our empirical knowledge to future lake management measures.
List of contents
Lake Ringsjön: its catchment area, its history and its importance.- Changes in nutrient load and lake water chemistry in Lake Ringsjön, southern Sweden, from 1966 to 1996.- Internal phosphorus loading in Lake Ringsjön.- Qualitative and quantitative investigations of phytoplankton in Lake Ringsjön, Scania, Sweden.- Autumn waterfowl abundance in Lake Ringsjön, 1968-1996.- Biomanipulation in a theoretical and historical perspective.- Planning and execution of the fish reduction in Lake Ringsjön.- The effects of cyprinid reduction on the fish community.- Lack of a top-down effect on the zooplankton community after a cyprinid reduction.- Juvenile fish expansion following biomanipulation and its effect on zooplankton.- Impact of cyprinid reduction on the benthic macroinvertebrate community and implications for increased nitrogen retention.- The development of submerged macrophytes in Lake Ringsjön after biomanipulation.- The occurrence of toxic blue-green algae in Lake Ringsjön, southern Sweden, despite nutrient reduction and fish biomanipulation.- Simulating the effects of biomanipulation on the food web of Lake Ringsjön.- Synthesis of theoretical and empirical experiences from nutrient and cyprinid reductions in Lake Ringsjön.
