1. Institute of Biostatistics and Analyses, Masaryk University, Brno, Czech Republic; e-mail: 437346@mail.muni.cz
2. Department of Biology, Faculty of Education, Masaryk University, Brno, Czech Republic; e-mail: radovan.smolinsky@gmail.com
3. Institute of Animal Physiology and Genetics, Czech Academy of Sciences, Brno, Czech Republic; e-mail: 328868@mail.muni.cz
4. Institute of Vertebrate Biology, Czech Academy of Sciences, Brno, Czech Republic; e-mail: martinkova@ivb.cz