1. Department of Ecology, Faculty of Humanities and Natural Sciences, University of Prešov, 17. November 1, 080 01 Prešov, Slovakia
2. Department of Environmentalistics and Natural Resources, Faculty of Regional Development and Interna-tional Studies, Mendel University in Brno, Zemědělská 1, 613 00 Brno, Czech Republic
3. Department of Agroecosystems, Faculty of Agriculture and Technology, University of South Bohemia in Ceske Budejovice, Branišovská 1645/31A, 370 05 Ceske Budejovice, Czech Republic