Naturalizing process of the invasive species of Xanthium albinum and Bidens frondosa in the Cis-Ural region of the Republic of Bashkortostan

There is some data on the naturalizing process of two invasive species from the Asteraceae family - Bidens frondosa L. and Xanthium albinum (Widd.) H. Scholz in the Cis-Ural region of the Republic of Bashkortostan. 26 coenopopulations of these species were detected and explored. The species penetrate into natural alluvial ecosystems in middle and lower reaches of the river Belaya and its influxes and dominate in the communities with the species proportion from 18 to 97%. Further distribution of Xan-thium albinum and Bidens frondosa in other riverbanks of the Cis-Ural region and their occupation of the leading positions in local ecosystems is expected.