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.

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