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The study presents the results of quantitative and qualitative analyses of heterotrophic bacteria (psychrophilic and psychrotrophic) in the water of Lake Hańcza – the deepest lake in Poland. Research was carried out from May to October 2000, in monthly intervals, at a research site located at the deepest point of the lake (108.5 m). Bacteria were incubated at 4, 10 and 25°C. Statistically significant differences were demonstrated between mean numbers of the bacteria examined depending on the temperature of incubation and period of water sample collection. The lowest numbers of the bacteria examined were recorded at an incubation temp. of 4°C, whereas the highest were at an incubation temp. of 25°C. In particular experimental months, on average, a higher count of aerobic psychrotrophic bacteria was observed in August, whereas that of psychrophilic bacteria was found in October. Amongst the identified microorganisms, Flavobacterium, Alcaligenes and Micrococcus genera were found to predominate, whereas the predominants of the family Enterobacteriaceae appeared to be Serratia marcescens, S. rubidaea, and Enterobacter aerogenes.
The paper presents the results of the study on seasonal changes in the number of bacterioplankton, its vertical distribution and morphological composition in the waters of the deepest Polish lake, Lake Hańcza (108.5 m deep). The research was performed from 1997 till 2000. Water samples were collected at a research station placed at a location where the lake depth was maximum, at monthly intervals from May to October. Water was sampled along the following depth profile: from 0-1 cm layer, at 0.3 m and at the depth of 1m, 2m, 5m, 10m, deeper down at 10m intervals towards the bottom. Bacteriological analyses were completed with measurements of selected physico-chemical parameters such as temperature, pH, oxygen, nitrogen and phosphorus contents. Obtained results with regards both to the number of bacterioplankton and its morphological structure, namely 68% for cylindrical rods forms, and physico-chemical assays confirmed the purity of Lake Hańcza.
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