The river valleys are characterized by high diversity of ecosystems, their originality, complex structure and dynamics. Changes in vertical displacements from the plain to channel in various parts of catena, which can be seen as an intricate complex integrating coenoses formation, geomorphological and pedogenic processes, are very important. Plant communities serve as indicators of territorial and temporal changes. Combinations of the communities within the ecological series influenced by environmental factors are characterized as ‘ecomers’, which reflect the trends of ecosystem changes, i.e. β-coenodiversity. Quantitative assessment of these plant communities is possible based on the synphytoindication methodology. There were selected three model river valleys, namely, those of the Sluch, Dniester, and Krasna rivers. Comparison of these rivers is of a special interest because they have different dimensions and flow in different natural areas. The topological differentiation in ecological series of the river valleys served for comparison of the ‘ecomers’, i.e. for assessment of β-coenodiversity differentiation towards changes of leading ecological factors.

Keywords: river valley, β-coenodiversity, catena, ecomer, plant communities

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