Some features of the biology of the invasive species Erigeron annuus L. in Abkhazia

The aim of the work was to study the biological features: morphometric parameters of species and their variability, as well as population characteristics of invasive species Erigeron annuus L. under the conditions of Abkhazia. The work was carried out in 2016-2019. in 7 regions of the Abkhazia Republic (Gagra, Gudauta, Sukhumi, Gulrypsh, Ochamchir, Tkvarchal, Gal). Population studies were carried out using the method of registration areas of 1-2 m 2 . Measurements were performed on 25 plants of each coenopopulation according to standard methods. The average height of plants in different regions of Abkhazia was from 57.0 to 94.8 cm, the density of coenopopulations was from 31 to 37 plants per 1 m 2 , the species biomass was from 0.09 to 0.14 kg/m 2 , and the species participation in communities (by biomass) was from 12.3 to 35.7%. For Erigeron annuus, different levels of parameter variation were noted - from low to very high (Сv - 6.4-70.8%). High seed productivity and ecological plasticity leads to the expansion of the distribution area in the territory of Abkhazia, as a result of which it is a common and burdensome weed of fallow lands and ruderal habitats.