Authors
Grzegorz Tończyk
Department of Invertebrate Zoology and Hydrobiology, University of Łódź, Łódź, Poland
Dariusz Halabowski
Department of Hydrobiology, University of Silesia, Katowice, Poland
Mariola Krodkiewska
Department of Hydrobiology, University of Silesia, Katowice, Poland