Nutrient Reduction and Biomanipulation as Tools to Improve Water Quality: The Lake Ringsjön Story

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.