Distribution and invasiveness of some invasive alien species (IAS) of plants in ecosystems of Colchis lowland (W Georgia / Sakartvelo)

The article presents the results of a floristic and phytosociological study conducted in western Georgia, specifically in the Colchis lowland, from 2021 to 2023. Thirty alien plant species, which have invaded at different times and are currently widely distributed, were identified based on botanical expeditions, field studies, and laboratory analyses of collected materials. Among the widespread species, six alien plants were identified: Canadian goldenrod ( Solidago canadensis L.), honey locust ( Gleditsia triacanthos L.), false indigo ( Amorpha fruticosa L.), common ragweed ( Ambrosia artemisiifolia L.), Brazilian vervain ( Verbena brasiliensis Vell.), and bur cucumber ( Sicyos angulatus L.). To study the characteristics of their distribution, research was conducted using Braun-Blanquet quadrat methods within the administrative boundaries of Kolkheti National Park and in the Chorokhi Delta along marked transects. As a result, the frequency, coverage, and density of their distribution were determined. The characteristics of their occurrence in ecosystems and their invasive potential were also assessed.