Okrzemki rzeki Dobrzynki w Pabianicach (Polska Środkowa)
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The Dobrzynka River is a left tributary of the 21.5 km long Ner River. Benthos samples were collected at the town of Pabianice, where the river is affected by communal-industrial sewage inflowing from a sanatorium at the village of Tuszynek, from the southern part of Pabianice and the „Pamotex” Cotton Mill. On the basis of 15 samples 97 diatom taxa were identified (Tab. I). Table II presents 5 dominant taxa (above 5%) and 9 subdominant taxa (2-5%). 18 constant species (81-100% of samples) were distinguished. Saprobity was determined for 84 species (Hofmann 1994, Lange-Bertalot 1994). On the basis of sapro-biological analysis the Dobrzynka River water at Pabianice may be characterized as α-β-mesosaprobic, which attributes the water to Water Purity Class II (Turoboyski 1979).