Abstract
This contribution presents the species abundance and diversity of the taxa of genus Potamogeton in selected Slovenian watercourses. A total of 40 watercourses, divided into 1231 reaches were surveyed and 8 species of the genus Potamogeton were assessed. Among these, Potamogeton nodosus was the most abundant, followed by P. pectinatus and P. natans. P. crispus was found to be the most frequently encountered species found in 251 reaches. Three hybrids, P. × cooperi, P. × salicifolius and P. × zizii were also found, each in only one or two watercourses. Pondweeds accounted for 19.5 % of the total relative abundance of all macrophytes in the watercourses that were surveyed. Canonical correspondence analysis reveals that land use, structure of riparian zone, substrate quality and flow dynamics exert a significant effect on distribution and abundance of pondweeds. Potamogeton species that were detected have different indicator values.
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