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The investigation of phytoplankton in Lake Żarnowiec was carried out prior to, in the course of construction, and after starting operation of the pumped-storage power station. On the basis of analysis of the developmental dynamics and dominance structure of species, the range and degree of derangement in the functioning mechanism of this community were demonstrated.
Before the pumped-storage power station was put into commission, a regular cycle of changes in the physico-chemical parameters of the surface water was observed. The working of the power station eliminated of distinctly shortened the occurrence of situations typical of late autumn and summer. The dominating systems of parameters in the lake were characteristic of spring and early autumn.
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