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The state of plant conservation in small water bodies located within the city limits of Olsztyn

Abstract The interior depressions in the Olsztyn area are characterized by high biodiversity. On the basis of floral surveys of 32 small water bodies, 200 species of vascular plants and 10 species of bryophytes were recorded. Phytosociological analysis indicated 45 plant associations. Among the phytocoenoses described, some communities require more attention, including Wolffietum arrhizae, Riccietum fluitantis, Charetum fragilis, the pondweeds Potametum nitentis and P. commpressi as well as communities with Potamogeton trichoides and P. pusillus. In light of their significant natural value, some of the basins studied units should be protected as ecological grounds. Reservoirs located in the Jaroty District, in the vicinity of Lake Track or some reservoirs located within the Gutkowo and Kortowo districts are important points of peatwater or water accumulation. These small water bodies limit the nutrient and pollutant input into the numerous lakes located in the Olsztyn area. Some basins are of a recreational character, including the reservoir located in the central quarter of the town and the water bodies of the Kortowo District. The remaining reservoirs need restoration and litter collection to restore their recreational functions.