Original paper

Cyanobacteria responsible for planktic water blooms in reservoirs in southern Poland

Bucka, Halina; Wilk-Woźniak, Elżbieta

Abstract

In various years during periodic investigations relating to the structure and abundance of phytoplankton communities, the mass development, particularly of three cyanobacteria species, was noted in different types of lowland and submontane reservoirs, being used for water-supply purposes. These were: Microcystis aeruginosa Kütz. which is the greatest contributer to water blooms and Aphanizomenon flos-aquae (L.) Ralfs, which is rather rare. The third species showing very intensive development in recent years with water blooms was the cyanobacterium Woronichinia naegeliana (Unger) Elenkin. It has been found that, in both types of reservoirs, water bloom formation was favoured by the following environmental factors: suitable nutrient concentrations (mainly phosphates and nitrates), adequate water temperature, pH, calm weather, the low turbulence of water, the mechanism of buoyancy, the size and shape of the dominant colonies, and apart from that, the retention time and the age of the reservoir.

Keywords

Reservoirs • water blooms • cyanobacteria