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Daphnia and Toxic Blooms of Microcystis aeruginosa in Bautzen Reservoir (GDR) by Doz. Dr. sc. Jürgen Benndorf; Dr. Manfred Henning is a Environmental Science article available to read on EtoBox.

What is Daphnia and Toxic Blooms of Microcystis aeruginosa in Bautzen Reservoir (GDR) about?

As a part of a whole-lake, long-term experiment in biomanipulation in the hypertrophic Bautzen reservoir (G.D.R.), during three years (1984-1986) the dynamics of mouse-related LD 50 of Jficrocystis aeruginosa was compared with the biomass development of this blue-green and the grazing pressure exerted by Dupphnia grclenta. Since the three summer averages of the biomass of D. galeata revealed strong differences due to dccreasing predation activity of fish from 1964 to 1966, the effects of different grazing pressure on Microcystis toxicity could bo investigated under field conditions. Microcystis was nontoxic a t the beginning of the growing season and developed high toxicity during its first strong biomass increase in summer in all three years. But this decrease of the LD 50 together with the first biomass increase of the season is found in quite different periods in different years (1984: August, 1985: July, 1986: June). It is obvious that the higher the mean effective filtration rate of D. galeata during summer is found the faster the toxicity of Microcystis is formed. If these observations are combined with findings of other authors, the conclusion can be drawn that the developme

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Author

Doz. Dr. sc. Jürgen Benndorf; Dr. Manfred Henning

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Ltd.; Wiley (ISSN 1434-2944)

Published

1989

Language

EN

ISBN

9781989074039

Field

Environmental Science (Physical Sciences)