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EN
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.
EN
The paper contains a physical-geographical description of the Bełchatów Industrial District (Fig. 1). In samples taken from the Widawka River above the mine, from draining channels, and from the artificial and natural river beds, 448 taxa of algae were identified (Table 1). Shells of the following species of fossil algae were found in the samples: Actineptychus undulatus (Bail.) Ralfs, Thalassiosira antigua (Grun.) A. Cl. (Fig. 2) and Dictyocha fibula Ehr. (Fig. 3). A new for Poland diatom species was recorded: Surirella bifida A. Cl., found on stands 4 and 6 (Fig. 4).
PL
W pracy podano charakterystykę fizyczno-geograficzną Bełchatowskiego Okręgu Przemysłowego (rys. 1). W próbach pobranych z rzeki Widawki powyżej kopalni, z kanałów odwadniających, sztucznego koryta oraz naturalnego koryta rzeki Widawki zidentyfikowano 448 taksonów glonów (tab. 1). W próbach napotkano na skorupki następujących gatunków glonów kopalnych: Actlnoptychus undulatus (Bail.) Ralfs, Thalassioslra antigua (Grun.) A. Cl. (fot. 1), Dictyocha fibula Ehr. (fot. 2). Podano nowy dla Polski gatunek okrzemki: Surirella bifida A. Cl., która występowała na stanowisku 4 i 6 (fot. 3).
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