Phytoplankton changes in Lake Trummen induced by restoration : long-term whole-lake studies and experimental biomanipulation / by Gertrud Cronberg.Material type: BookPublisher: Lund : Limnologiska Institutionen Lunds Universitet, 1980Description: 117, ,  leaves, 32 unnumbered pages of plates : illustrations ; 27 cm.Subject(s): PHYTOPLANKTON | AQUATIC MICROBIOLOGY | ENVIRONMENTS | LAKE RESTORATION | LAKE ECOLOGY | BIOMASS | BLUE-GREEN ALGAE | GREEN ALGAE | GOLDEN ALGAE | NANNOPLANKTON | PREDATION | ECOLOGICAL STUDIES | BIOLOGICAL TECHNIQUES | EUTROPHICATION | LIMNOLOGY | INLAND WATER ENVIRONMENT | GROUNDWATER POLLUTION | INDUSTRIAL WASTES | FOOD WEBS | WATER QUALITY MANAGEMENT | LAKES | LAKE TRUMMEN | SWEDENHoldings: GRETA POINT: 581.526.325 CRO
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To be printed in: Folia limnologica Scandinavica
Includes bibliographical references (leaves 106-117).
INTRODUCTION -- LAKE TRUMMEN -- WHOLE LAKE STUDY -- I. MATERIAL AND METHODS -- 1. Sampling -- 2. Quantitative analyses of phytoplankton -- A. The Utermöhl method -- B. Sonication of blue-green algae -- C. The epifluorescence method -- 3. Qualitative analyses with LM -- 4. Qualitative analyses with EM -- A. Preparation for SEM -- B. Preparation for TEM -- C. Preparation for EDS analysis -- 5. Calculation of species diversity -- 6. Netsamples from 1943-1967 -- II. RESULTS -- 1. Phytoplankton 1943-1967 -- 2. Phytoplankton 1968-1978 -- A. General seasonal changes -- B. Qualitative and quantitative changes within the taxonomic groups -- Cyanophyta -- Chlorophyta -- Euglenophyta -- Chromophyta -- Chrysophyceae -- Diatomophyceae -- Xanthophyceae -- Pyrrhophyta -- Dinophyceae -- Cryptophyceae -- Undetermined μm-algae -- Raphidophyta -- Colourless flagellates -- Raphidophyta -- Species composition -- Species diversity -- III. SUMMARY -- EXPERIMENTAL BIOMANIPULATION -- I. INTRODUCTION -- II. MATERIALS AND METHODS -- 1. Description of the enclosures -- 2. Experimental design and problems -- 3. Sampling -- III. RESULTS -- 1. Enclosure experiments with fish -- 2. Whole lake biomanipulation -- IV. SUMMARY -- LIMNOLOGICAL SYNTHESES -- Influence of sampling technique -- Influence of climatic factors -- Influence of restoration procedure -- Inoculation of algae to plankton -- Interactions of fish and zooplankton -- Development of phytoplankton in Lake Trummen -- ACKNOWLEDGEMENT -- REFERENCES -- Appendix I: Species list -- Appendix II: Plankton volumes -- Appendix III: Micrographs -- Appendix IV: Taxonomical comments.
Lake Trummen, Sweden, was heavily polluted with sewage water and industrial wastes during 1936-1958. All sewage water was diverted in 1958, but the lake did not recover. The lake was restored by suction dredging of 0.5 m nutrient-rich sediments in 1970-1971. The phytoplankton development was studied between 1968-1978. The restoration of Lake Trummen induced drastic changes in the phytoplankton community. Before restoration high blue-green algal biomass was recorded. After restoration the blue-green algae community changed and their biomass was reduced by 90-95%. Eutrophic species such as Mycrocystis spp., Oscillatoria agardhii, Aphanizomenon flosaquae and Anabaena spp. were replaced by mesotrophic species such as Aphanothece clathrate, Aphanocapsa delicatissima, Aphanizomenon gracile and Oscillatoria limnetica var. acicularis. Green algal biomass decreased. Chlorococcales was reduced while Zygnematales increased. Diatoms became more frequent during summers. The number of nannoplankton increased. Many changes were recorded at species level. Three new species were recorded. Approximately 320 species were identified and micrographs (LM and EM) of ca. 80 species made. Experiments were performed with different species of fish in enclosures. Eutrophication appeared in systems with dense fish populations, whereas oligotrophication took place in systems with low fish populations.
GRETA POINT: 581.526.325 CRO