1. Laboratory of Aquatic Ecology, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil, CEP 36036-900
2. Laboratory of Limnology, Department of Ecology, Institute of Biology, CCS-UFRJ, P.O. Box 68020, Rio de Janeiro, Brazil, CEP 21941-590
3. Department of Sanitary and Environmental Engineering, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil, CEP 36036-900
4. Laboratory of Cell Biology, Department of Biology, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais, Brazil, CEP 36036-900