Glony osiadłe ujściowych odcinków głównych dopływów Widawki
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Sessile algae were collected from lower sections of therivers: Rakówka, Pilsia, Krasawa, Grabi a and Nieciecz. The investigated rivers lie with in a cone of depression formed due to the construction of the lignite open mine Bełchatów. Quantitative and qualitative composition of algal communities was determined in the samples. In total, 417 taxa of algae and 3 taxa of bacteria were recorded - among them: 153 taxa from the Rakówka River, 211 taxa from the Pilsia River, 222 taxa from the Krasawa River, 220 taxa from the Grabia River, and 234 taxa from the Nieciecz River.