Ponds Syrenie Stawy in Szczecin - Changes of Selected Water Quality Chemical Indices

The possibility of using - to a wider inference - water quality test results of stream Osowka flowing through ponds Syrenie Stawy in Szczecin (NW-Poland) - in particular the concentration of dissolved oxygen (DO), electrical conductivity (EC) and the total concentrations of nitrogen (TN) and phosphorus (TP) - conducted in the years 1994 to 2014 was analyzed. The examined indices were classified according to Official Standards currently in force in Poland. Changes of water quality as it flows through the ponds were identified. Multivariate linear regression equations were calculated, endearing statistically significant relationship between successive test indicators (y_i) and other indices (x_i) and deadlines for measurement periods (T_i) has been made. This allowed in general to characterize water quality, determine the quality changes along the path of flow through ponds and discern what processes biohydrogeochemical within the ecosystem changes affected their quality.