An investigation was carried out in the Goczałkowice Reservoir at the Stations “Corral” and “Platform”. Copper treatment applied to the algae brought a decline in cladocerans and a decrease in their pressure on the phytoplankton and, in consequence, on an abundant secondary development of chlorococcous green algae. The population of cladocerans was considerably reduced by Acanthocyclops robustus just before coppering. The invasion of a fungal parasite inhibited the intensive development of Asterionella formosa in the Corral, where a later mass occurrence of Ceratium hirundinella led to the almost total disappearance of zooplankton.
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