Abstract
In Bautzen reservoir, a shallow, hypertrophic water in Eastern Saxony, biomanipulation led to structural changes in the phytoplankton community but did not reduce algal biomass. To supplement the top-down management, a new type of water treatment technology was tested during two seasons (May–August 1996/1997), aiming at the bottom-up control of mass developments of the cyanobacterium Microcystis aeruginosa.The technology is based on a combined lake–internal phosphorus precipitation and a transport of hypolimnetic water rich in free carbon dioxide into the upper layers. During the treatment periods, there were found both an increase of CO2concentrations in the mixed layer and an extension of the period in which free CO2was detected in the epilimnion. The concentrations of phosphorus could be lowered drastically in the whole water body. Microcystiswas almost totally suppressed (1996) or appeared with a delay (1997) compared to the regular annual pattern observed before the treatment. In contrast to the preceding year (1995), diatoms played a major role in the summer phytoplankton during the treatment years (1996/1997). The two application periods are compared with respect to the influence of meteorologically determined variables.
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Deppe, T., Ockenfeld, K., Meybohm, A. et al. Reduction of Microcystis blooms in a hypertrophic reservoir by a combined ecotechnological strategy. Hydrobiologia 408, 31–38 (1999). https://doi.org/10.1023/A:1017097502883
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DOI: https://doi.org/10.1023/A:1017097502883