The aim of the study is to identify plant communities susceptible to the invasion of Bidens frondosa in the coastal zone of the Sejm River in Kursk. During the summer of 2024, twenty releves were conducted in coastal ecotopes. The processing of the material was carried out according to the principles of ecological-floristic approach. As a result, seven associations were identified, consisting of 5 unions, 5 orders and 4 classes. The analysis of the structure of plant communities revealed that the highest rates of plant cover were typical for associations belonging to the classes of Phragmito-Magnocaricetea, Molinio-Arrhenatheretea and Epilobietea angustifolii, which were less susceptible to anthropogenic influence. The communities classified as Bidentetea class, exhibited lower plant cover, which is associated with regular disturbances of vegetation and soil. The maximum average number of species per a test plot was observed in association Agrostio stoloniferae–Xanthietum albini, characterized by a variable moisture regime and the presence of species from periodically disturbed habitats. A study of ecological regimes has shown that Bidens frondosa is embedded in plant communities with a sufficiently wide range of habitat conditions. The greatest variation is typical for such factors as moisture, soil acidity, shading and illumination, as well as the level of anthropogenic impact in an urban environment, which reflect the indicators of hemerobiality and urbanity. The most favorable conditions for Bidens frondosa are increased soil moisture and severe disturbances developing in communities of Bidentetum frondosae association, in which this species dominates and serves as a diagnostic indicator. In communities of riparian-aquatic and meadow vegetation belonging to the classes of the Phragmito-Magnocaricetea and Molinio-Arrhenatheretea, Bidens frondosa is recorded in lower abundance. Howerver, it occurs there regularly in them, potentially influenced by recreational activities along the banks of the Seim River, which contribute to the degradation of natural ecosystems and reduce the resilience of phytocenoses to the invasion of alien species.
Bidens frondosa, invasion, coastal ecotopes, plant communities, Kursk.
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