Distribution of alien species from Poaceae and Asteraceae families in the protected areas of Ukrainian forest-steppe.
The current paper evaluates the abundance of alien species from Asteraceae and Poaceae families in different types of biotopes. We have discovered species exhibiting eurytopic properties and forming the ecological niches in three or more biotope types and recorded from only two biotope types, including anthropogenic ones. The majority of anthropophytes from Asteraceae family are eurytopes having the potential to move to other biotopes, due to their ecological amplitude and phytocoenotic strategy. Only five species of Poaceae family showed high exploration trend in different habitat types: Setaria viridis (L.) P. Beauv., Bromus tectorum L., B. arvensis L., B. commutatus Schrad., Eragrostis minor Host, and have the potential to further spread. It was found that in contrast to Asteraceae family, where eurytopic species prevail, the Poaceae family has only a third of eurytopes in its overall species composition. Alien species distribution for the protected areas of the Ukrainian forest-steppe by generic floristic spectrum revealed two times higher taxonomic diversity of Asteraceae family than the Poaceae one. Among Asteraceae there are such best-represented genera as Artemisia L., Helianthus L., Xanthium L. The analysis of taxonomic structure of the model protected areas and the evaluation of their participation in the formation of different habitat types suggest a low taxonomic diversity and quite uneven coenotic role of individual anthropophytic taxa. It should be noted that such genera as Phalacroloma Cass., Sonchus L., Xanthium, Bromus Scop. and Setaria P.Beauv. have a particular importance, having the leading positions both concerning the wide spectrum of species, and concerning exploration of different biotope types. Geographical distribution analysis showed that the biotopes of protected areas of the central forest-steppe are highly explored by the alien members of Asteraceae and Poaceae families and are located in the floodplains of the Dnieper River. The representatives of Asteraceae family are least recorded in the eastern model floras, while Poaceae family are least recorded in eastern and southern model protected areas.