1Department of Hydrobiology, Faculty of Biology and Environmental Protection,
Nicolaus Copernicus University in Toruń, Lwowska 1, 87-100 Toruń, Poland
2Department of Invertebrate Zoology, Faculty of Biology and Environmental Protection,
Nicolaus Copernicus University in Toruń, Poland
Pol. J. Environ. Stud. 2014;23(2):409–417