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The study aimed to analyse the seasonal variability of phosphorus concentrations and phosphorus content and the impact of catchment development of the Panew Mała River. The study presents the findings of a two-year experimental investigation (comprising 17 measurement series across 12 measurement cross-sections) into the concentration of phosphorus (P) and its soluble form, orthophosphates (PO42−). The mean phosphate concentrations were found to be low, with a range of 0.03 to 0.08 PO42− mg∙dm−3. In contrast, the total phosphorus concentrations were relatively high, with a range of 0.11 to 0.43 mg∙dm−3 The seasonal variability was analysed based on quarterly means and half-yearly periods covering quarters II and III (spring–summer) and quarters I and IV (autumn–winter), respectively. The analysis of spatial variability was conducted using cluster analysis according to Ward’s method, with the Euclidean distance employed as a measure of distance and the results related to the utilisation of different catchment area. Due to the slight differences in the phosphate concentration, the total phosphorus concentration was analysed in detail. The analysis of variance showed no significant differences between phosphorus concentrations in certain quarters, while greater variations were obtained for half-yearly periods. The applied method of grouping the sampling sites made it possible to distinguish several groups of sampling sites, which indicate relations between the values of phosphorus concentration in the waters of Mała Panew and the type of use of the catchment area.

Abstract We have carried out studies to examine the possibility of using biosorbents: the epigeic mosses Pleurozium schreberi (Willd. ex Brid.) Mitt., and the epiphytic lichens Hypogymnia physodes (L.) Nyl. in active biomonitoring of heavy metal pollution of surface waters. The dried sea algae Palmaria palmata (L.) Weber & Mohr were used as the third biosorbent. The studies were conducted in the waters of the Turawa Reservoir, a dam reservoir with a significant level of eutrophication in south-western Poland. Incremental concentrations of Mn, Ni, Zn, Cu, Cd, and Pb were determined in the exposed samples. It was shown that a 2-h exposure period increases the concentration of some metals in the exposed samples, even by as much as several hundred percent. High increments of nickel concentrations in the algae Palmaria palmata (mean: 0.0040 mg/g, with the initial concentration of c 0

The article presents the results of research aimed at determining the catchment areas that pose a risk of nitrogen pollution of the waters of the Mała Panew river. The research was carried out in 13 permanent monitoring points located on the Mała Panew. The location of the points ensured the representativeness of the water quality results for parts of the catchment area with a homogeneous type of land use. Concentrations of nitrate-nitrogen (NO3-N) and total nitrogen (TN) were determined in the samples taken. The content of (NO3-N) in the third quarter of the year and its relation to the value obtained for the first year quarter may be an indicator of the impact of agricultural activities on the quality of water in streams. In the case of agricultural catchments, the lowest concentrations of NO3-N and TN occur in the third quarter of the year and are significantly lower than in the first quarter of the year. The demonstrated seasonal variability of nitrate nitrogen concentrations in agriculturally used areas may be used to determine the type of pressure not allowing to achieve good water status in the surface water body. It was shown that the highest unit increments occurred in areas with a high proportion of forest.