Hypertrophic Ecosystems : S.I.L. Workshop on Hypertrophic Ecosystems held at Växjö, September 10-14, 1979

The idea of convening an international workshop on hypertrophic ecosystems originated during the 20th S.I.L. Congress in Copenhagen. A group of about 30 delegates met there in an informal gathering to discuss the specific problems of lakes which have reached a noxious stage of eutrophication. This ad hoc group realized its own specific identity within the limnological community and suggested the organization of a specialized future meeting on hypertrophic ecosystems. After two years of preparatory work, the workshop was fmally held in Vaxjo, Sweden, between September 10 and 14, 1979, on the premises of the University campus. The Institute of Limnology, University of Lund (Professor Sven Bjork), undertook the task of host and organizer. The City ofVaxjo and the University of Lund co-sponsored the event, which was held under the auspices and patronage of the Societas Internationalis Limnologiae. The objective of the workshop was to seek better understanding of highly-eutrophic, disturbed and unstable aquatic ecosystems (lakes, reservoirs and ponds developing noxious algal and bacterial blooms, fluctuating in their water quality on a daily and seasonal scale, producing gases, off-flavor and toxic substances, experiencing periodic anoxia and massive fish kills, etc.), Le., systems requiring corrective measures and new concepts for their solution beyond those generally accepted for 'normal' eutrophic systems. Front Matter....Pages i-xv Front Matter....Pages xvii-xvii The Summer Limnology of Lake Waahi, New Zealand....Pages 1-12 Identification of Different Phosphorus Forms and their Role in the Eutrophication Process of Lake Balaton....Pages 13-22 Metalimnetic Gradient and Phosphorus Loss from the Epilimnion in Stratified Eutrophic Lakes....Pages 23-27 The Influence of Sediments on Changed Phosphorus Loading to Hypertrophic L. Glumsø....Pages 29-36 The Cyanobacterium Microcystis Aeruginosa Kg. and the Nitrogen Cycle of the Hypertrophic Lake Brielle (The Netherlands)....Pages 37-43 Comparison of Hypertrophy on a Seasonal Scale in Dutch Inland Waters....Pages 45-55 Control of Undesirable Algae and Induction of Algal Successions in Hypertrophic Lake Ecosystems....Pages 57-65 Occurrence of Oscillatoria Agardhii and Some Related Species, a Survey....Pages 67-77 The Influence of Periodicity in Light Conditions, as Determined by the Trophic State of the Water, on the Growth of the Green Alga Scenedesmus Protuberans and the Cyanobacterium Oscillatoria Agardhii ....Pages 79-82 The Role of Microlayers in Controlling Phytoplankton Productivity....Pages 83-93 Short-Term Load-Response Relationships in Shallow, Polluted Lakes....Pages 95-103 The Importance of Trophic-Level Interactions to the Abundance and Species Composition of Algae in Lakes....Pages 105-116 Vegetation Changes in the Nutrient-Rich Shallow Lake Hjälstaviken....Pages 117-121 N 2 -Fixing Cyanobacteria: Why They Do Not Become Dominant in Dutch, Hypertrophic Lakes....Pages 123-130 Front Matter....Pages 131-131 Nitrate Overdose; Effects and Consequences....Pages 133-137 A Chemical Model to Describe Nutrient Dynamics in Lakes....Pages 139-149 Changes in Respiration and Anaerobic Nutrient Regeneration during the Transition Phase of Reservoir Development....Pages 151-158 Modelling Carbon and Phosphorus in a Small Hypertrophic North German Lake....Pages 159-169 An Algal Bloom Model as a Tool to Simulate Management Measures....Pages 171-178 Phosphorus Stability in a Hypereutrophic Lake....Pages 179-190 Front Matter....Pages 131-131 Structural and Functional Quantification in a Series of Hungarian Hypertrophic Shallow Lakes....Pages 191-202 Muddy Odour in Fish from Hypertrophic Waters....Pages 203-208 The Importance of Hydrologic Factors on the Relative Eutrophic Impacts of Point and Non-Point Pollution in a Reservoir....Pages 209-219 Environmental Constraints on Anabaena N 2- And CO 2 -Fixation: Effects of Hyperoxia and Phosphate Depletion on Blooms and Chemostat Cultures....Pages 221-229 Toxicity Fluctuations and Factors Determining Them....Pages 231-234 Stability and Multiple Steady States of Hypereutrophic Ecosystems....Pages 235-247 Front Matter....Pages 249-249 On the Role of Soil in the Maintenance of Fish Ponds’ Fertility....Pages 251-254 Fish as a Factor Controlling Water Quality in Ponds....Pages 255-261 The Role of Fishery Management in Counteracting Eutrophication Processes....Pages 263-269 Fish Production in Some Hypertrophic Ecosystems in South India....Pages 271-277 Front Matter....Pages 279-279 Enrichment and Recovery of a Malaysian Reservoir....Pages 281-285 Lake Treatment with Hydrogen Peroxide....Pages 287-294 Characterization of the Recovery Processes in Hypertrophic Lakes in Terms of Actual (Lake Water)- and Potential (Algal Assay) Chlorophyll....Pages 295-303 Morphometrically Conditioned Eutrophy and Its Amelioration in Some British Columbia Lakes....Pages 305-315 Hartbeespoort Dam: A Case Study of a Hypertrophic, Warm, Monomictic Impoundment....Pages 317-322 Cascade Reservoirs as a Method for Improving the Trophic State Downstream....Pages 323-327 Front Matter....Pages 329-329 Concluding Remarks....Pages 331-333 Front Matter....Pages 335-335 The Effect of Pig Manure and Mineral Fertilization on a Eutrophic Lake Ecosystem....Pages 337-337 Hypertrophy in Slow Flowing Rivers....Pages 338-338 CO 2 -Uptake as a Measure of Bacterial Production....Pages 339-342 Front Matter....Pages 335-335 Response of Shallow Hypertrophic Lakes to Reduced Nutrient Loading....Pages 343-343 Fish as a Regulator of Structure and Function in Eutrophic Lake Ecosystems....Pages 343-343 Algenbekämpfung Durch Zusatz Von Kalk- und Dolomithydrat....Pages 343-344 Possible Triggering Mechanisms for the Collapse of Aphanizomenon Flos-Aquae Blooms....Pages 344-344 Self-Purification and Respiration in Polysaprobic Area of Natural Flowing Waters Receiving Raw Domestic Sewage....Pages 344-344 Short-Circuit Metabolism in Highly Eutrophic Lakes—Relationship between Primary Production and Decomposition Rates....Pages 345-345 Heterotrophic Functions in the Freshwater Carbon Cycle....Pages 345-345 Effects of Temperature and Temperature-Nutrient Interactions on Phytoplankton Growth....Pages 346-346 Natural and Induced Sediment Rehabilitation in Hypertrophic Lakes....Pages 346-346 Aspects of Biological Competition between Stigeoclonium Tenue and Cladophora Glomerata , Two Filamentous Green Algae, Characteristic of Eutrophic Waters....Pages 347-347 Seasonal Succession and Standing Crop Determinations of the Epiphytic Algae in Two Hypertrophic Lakes....Pages 347-347 Nitrogen Transformations in Artificial Loaded Limnocorrals....Pages 347-348 Zur Quantitativen Bestimmung der Potentiellen Bioproduktion in Aquatischen Okosystemen Mittels Algentest....Pages 348-348