Pondweed family (Potamogetonaceae Bercht. et J. Presl) in the aquatic flora of Pukhovichy Plain

At present, the pondweed family (Potamogetonaceae) within the Pukhovichy Plain includes 13 species and 8 hybrids. The taxonomic diversity of the family was determined using the grid mapping method from 2018 to 2023. Three new taxa have been identified for the flora of Belarus: Potamogeton × franconicus G. Fisch., P. × olivaceus Baagøe ex G. Fisch., P. × grovesii Dandy et G. Taylor. The homogeneity of the species of the family in ecological and biological terms was de- monstrated. The species were predominantly freshwater perennial grasses (61.5 %), hydrophytes (34.2 % of the species of the aquatic core of the flora), cryptophytes-hydrophytes, scioheliophytes, neutrophils (61.5 %) or moderate acidophiles (38.5 %), mesotrophs (76.9 %) or mesoeutrophs (23.1 %), dominants and subdominants of phytocenoses. The most prevalent and stable species and hybrids in the flora of the plain ( P. natans L. , P. lucens L., P. perfoliatus L.), which belong to the group of broadleaved pondweeds, have been identified. 57.7 % of their localities are connected to the river network. The rarity and reduction in the growth locations of almost all linear-leaved pondweed taxa ( P. obtusifolius Mert. et W. D. J. Koch , P. pusillus L. , P. acutifolius Link) and their vulnerability due to being confined to artificial and transformed water bodies by 57.6 % have been established. А relatively high hybridogenic activity of linear-leaved pondweeds and the continued reproduction of hybrids in the absence of parental species have been revealed.