Some Data on the Adventive Component of Flora in Communities of Aquatic and Coastal-Aquatic Vegetation in Saline Ecotopes of Southeastern Europe

Abstract

In the article, the author analyzes the features of the invasions of alien plant species in the European Southeast into communities of two classes of aquatic and coastal aquatic vegetation-Crypsidetea aculeatae Vicherek 1973 and Phragmito-Magno-Caricetea Klika in Klika et Novák 1941. In the saline habitats of this mega-region in the above communities the alien species turned out to be represented in very limited quantities [2 species-Atriplex tatarica L. (Chenopodiaceae Vent.) and Echinochloa crus-galli (L.) P. Beauv. (Poaceae Barnhart)], in terms of syntaxonomy (only in 4 lower units of the “association-community” rank), and geographically (only in the Lower Volga region, the lower reaches of the Volga River-Astrakhan oblast). The total share of alien species in the cenoflora of the lower syntaxa of the classes under consideration is insignificant and varies from 2 to 5.5%. Echinochloa crus-galli is most successfully adapted to local conditions. It invades communities of both of these classes, which are found on soils of the entire range of salinity (from weak to strong). But at the same time, the level of soil salinity, obviously, is a certain limiting factor for it. Since this species is more massively present in communities growing on weakly and moderately saline soils than in highly saline soils.