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

Grzybowski M., Endler Z.

Oceanological and Hydrobiological Studies

2008

Vol. 37, No.4

73-83

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.

Wpływ jazu w Konstancinie-Jeziornej na kształtowanie się jakości i ilości zasobów wodnych oraz roślinności wodnej rzeki Jeziorki

Włodarczyk A.

Przegląd Naukowy Inżynieria i Kształtowanie Środowiska

2006

Vol. 15, No. 2

121--129

The article presents impact of weir on diversifi cation of quality and quantity of water resources and phytocoenosis. The study area was at Konstancin-Jeziorna weir on Jeziorka River. Jeziorka River is the Landscape Protected Area. In that case the weirs can not contribute to unfavourable environmental change and to deteriorate water quality. Water quality and hydrometric measurements was investigated in three cross-sections: tailwater, headwater and end of backwater. Depth, average velocity and flows was measured. Physico-chemical analysis include: temperature, pH, conductivity, colour, turbidity, BOD5, CODMn, dissolved oxygen, N-NO3, N-NH4, P, Fe, Na i K. The phytocoenosis was investigate in cross-section at 20-100 m intervals. The result of the research was that the weir has influence on diversification of flows in Jeziorka River. The weir cause decrease of velocity and increase of depth in headwater. Diversification of flows cause changes in some water quality indexes (colour, turbidity, dissolved oxygen, BOD5). Moreover there is the diversification of aquatic phytocoenosis exist in the neighbourhood of the weir.