http://hdl.handle.net/11320/52 2026-06-01T17:59:26Z http://hdl.handle.net/11320/17700 Tytuł: Modern problems and solutions in environmental protection - 2021. Post-conference monograph Redaktor(rzy): Czyżewska, Urszula; Bartoszewicz, Marek; Sawczuk, Róża 2021-01-01T00:00:00Z http://hdl.handle.net/11320/17688 Tytuł: Long term changes of crustacean zooplankton communities in Lake Wigry as a response to changing trophic conditions - 100 years of observations Autorzy: Moroz, Joanna; Karpowicz, Maciej; Górniak, Andrzej; Smolska, Sabina Abstrakt: Wigry Lake has one of the longest zooplankton data sets in Poland and has been investigated for over 100 years. Therefore, our goal was to present long-term changes in zooplankton structures against the background of changing trophic conditions. The species composition of crustacean zooplankton in the first half of the 20ᵗʰ century was typical for a large mesotrophic lake, with a high share of Oaphnia cucullata and stenotherm species: Eurytemora lacustris, Heterocope appendiculata, Cyclops lacustris, Bythotrephes brevimanus, Oaphnia longiremis. The results of the research from the years 1965-1985 were very pessimistic, because the lake was exposed to intense eutrophication and there were important changes in zooplankton communities. The glacial relicts and species characteristic for low trophic condtions declined, while the share of species typical for high trophic conditions (Mesocyclops leuckarti, Thermocyclops oithonoides, Oiaphanosoma brachyurum) increased. As a result, species characteristic for eutrophic conditions made up to 70% of crustacean zooplankton, when in 1921 their share did not exceed 25%. The results of hydrochemical and biological studies of the last 30 years indicate a gradual tendency to improve the trophic state of Lake Wigry, due to biomanipulation activities carried out in the lake and its catchment area. We also have observed a marked increase in the occurrence of glacial relicts and the dominance of large Oaphnia individuals, which indicates an improvement in water quality. 2021-01-01T00:00:00Z http://hdl.handle.net/11320/17686 Tytuł: Impact of water quality on summer bacterioplankton in springs of Gryżyński Landscape Park Autorzy: Zieliński, Piotr; Szczucińska, Anna; Stopińska, A.; Pol, Wojciech; Jekatierynczuk-Rudczyk, Elżbieta Abstrakt: The study aimed to analyze hydrochemical and bacteriological features in selected springs of the Gryżynski Landscape Park (GLP) in western Poland. The basic hydrochemical parameters and the abundance and biomass of bacteria were analyzed in water samples collected from 22 springs in GLP in July 2018. The hydrochemical composition of the GLP spring waters depends mainly on the specific geological structure and character of catchment land use. The research showed Significant differences in the water quality of GLP springs in the case of many hydrochemical parameters, e.g., dissolved organic carbon concentration, biogenic substances which influence the bacterial abundance and biomass. The average bacterial number (BN) in the waters of the Gryzynski Landscape Park springs was 0.656 10⁶ cells/ml, with a range from 0.181 10⁶ cells/ml to 1.656 106 cells/ml. The coefficient of variation of this parameter was 75.67%. In 12 investigated springs of GLp, BN was below 0.5 10⁶ cells/ml, in 6 springs, the average BN was between 0.5 and 1 10⁶ cells/ml, and in 4 springs BN, it was in the range from 1 to 2 10⁶ cells/ml. The mean bacterioplankton biomass was 22.98 pgC / I and from 6.35 to 61.54 pgC /l. Based on the collected material, many correlations between BN and selected water quality parameters were found (temperature, phenolics, phosphates, nitrites, and dissolved organic carbon). The microbiological condition of investigated springs depends mainly on the geological structure of the spring niches and water quality. Moreover, the research shows that GLP springs are susceptible to human activity in the direct catchment area. Therefore, this research indicates the potential possibility of using hydrochemical and microbiological parameters together to assess the ecological condition of lowland springs or in planning protective measures. 2021-01-01T00:00:00Z http://hdl.handle.net/11320/17685 Tytuł: Vertical and horizontal changes in the abundance and activity of bacteria in Lake Hańcza, NE Poland Autorzy: Pol, Wojciech; Więcko, Adam; Jekatierynczuk-Rudczyk, Elżbieta; Zieliński, Piotr Abstrakt: A bacteriological study was conducted in late summer (early September 2018) in the deepest postglacial reservoir in the central lowland depression - Lake Hańcza (northeastern Poland). The aim of the study was to determine the spatial variation in the density of planktonic bacteria, the level of their hydrolytic activity and the ratio of live to dead bacterial cells. During the fieldwork 92 water samples were collected from thirteen stratified sites located in different parts of the lake. The bacterial number ranged from 0.57 to 3.97 (10⁶ cells m⁻¹). No horizontal or vertical changes in bacterial number were observed in a uniform pattern. The highest bacterial abundance was recorded at two coastal sampling points, both located in the southern part of the lake at the direct catchment area with commercial development ("agroturism" guesthouses) . There was little difference in bacterial number across the horizontal gradient (F = 1.865; P = 0.170). Many water quality parameters appeared to be significant factors correlating with bacterial abundance in Lake Hancza. There were no statistically Significant differences in hydrolitical bacterial activity and live/ dead ratios between investigated sites and across horizontal gradient. Our results indicate that bacterial activity in deep lakes is affected by many water quality parameters, such as temperature (r=0.667), Ca²⁺ (r=-0.4510), Mg²⁺(r=0.511), N0₃- (r=-0.587) and oxygen saturation (r=0.582). Taking into account previous hydrobiological studies, Lake Hancza was found to be very patchy in terms of bacterioplankton abundance. 2021-01-01T00:00:00Z