EN
One of the major factors in progressive degradation of water resources in the global scale has been the conversion of semi-natural landcape into intensively used agricultural landscape. As far as the freshwater ecosystems appear in depressions of the landscape, all anthropogenic processes are reflected in water resources quality and biodiversity of freshwater ecosystems. Due to high complexity of various anthropogenic factors which appear in anthropogenic landscape, to revers the degradation of freshwater resources a system approach - Ecohydrology - has been proposed. This new integrative science focused on the problem solving has been based on three hypotheses: 1. (H1) Biota structure and dynamics may be regulated by biological processes; 2. (H2) By shaping biota structure and by regulating biota dynamics it is possible to improve the water quality to moderate hydrological variability; and 3. (H3) Two types of regulatory actions (H1, H2) may be hannonized with existing hydrotechnical solutions. This scientific concept has been recently developed and implemented in the framework of the UNESCO International Hydrological Programme and UNEP-IETC in Europe, Africa, South America and Asia.