Abstract
The numerous sources of pollutants along the Tibagi river, Parana State, south of Brazil, are responsible for water and sediment contamination through organic and inorganic chemicals. The present study correlates the phytoplanktonic community to abiotic variables and assesses the impact of effluents of a paper and cellulose industry on this ecosystem, by means of six collecting sites during two rainy and two dry seasons. A total of 202 taxa are recorded, of which 48.5% belong to Order Desmidiales, 25.0% to Class Bacillariophyceae, 10.0% to Order Chlorococcales and 16.5% to other groups (Euglenophyta, Cyanophyta, Chrysophyceae, Tribophyceae and Volvocales).
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