We tested hypotheses about a decrease of species richness and an increase of the participation of alien species in communities invaded by Acer negundo L. in three remote regions – in the Belarusian Polesia, the Middle Volga region and the Middle Urals. In three regions, 39 pairs of sample plots invaded and noninvaded by A. negundo were described. It was found that when A. negundo dominates the total number of species and the number of native species are 20–47 % lower; the proportion of alien species is higher by 7–34 %. The weakening of the positions of native species and the weak strengthening of the positions of alien species indicate the presence of selectivity in the influence of boxelder maple on florogenetically different (native and adventitious) groups of plants.

D.I. Dubrovin, D.P. Dubrovina, D.V. Veselkin