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JOURNAL OF PLANKTON RESEARCH | VOLUME 5 | NUMBER 6 | PAGES 855-864 | 1983
© Oxford University Press

research-article

Effects of artificial destratification on the phytoplankton populations in a small lake

Christian Steinberg

Bayerisches Landesamt für Wasserwirtschaft Lazarettstrasse 67, D-8000 Munich 19, FRG

Received on January 1, 1983; accepted on May 1, 1983 In a small polytrophic and meromictic lake (Fischkaltersee, Iffeldorf lake district, Upper Bavaria, FRG) artificial destratification was installed to increase water quality. During this procedure, viable biomass of algae in the water column almost doubled. This increase was not paralled by an adequate increase in primary production. Artificial destratification caused a total and enduring decrease of cyanophytes after one species, Oscillatoria limnetica, bloomed for a very short period of time, probably due to elevated concentrations of several chemical compounds after destroying the monimolimnion. The cyanophytes were replaced by various species of coccal and tetrasporal chloro-phytes, centric diatoms and small cryptophytes. Two kinds of mechanisms, responsible for this structural shift, are discussed: advantages for green algae and diatoms as well as disadvantages for cyanophytes.


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