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Abstract

The paper presents the results of the studies on a degree of pollution and sanitary-bacteriological stale of bottom sediments of Wigry Lake in I 998 and 1999. Total Viable Count at 20°C (TYC 20°C) and Total Viable Count at 37°C (TYC 37°C) were used as indicators of pollution, while Total Coli (TC), Faecal Coli (FC), Faecal Streptococcus - Enterococcus (FS) and Clostridium perfringens - as indicators of the sanitary stale. Bottom sediment samples wen: collected from 3 sites situated in the centre of the lake and from 6 sites in the vicinity of the lake shore. Sanely and gravel offshore bottom sediments showed less degree or pollution than muddy bottom sediments collected from the centre or the lake. Higher numbers of anaerobic spore-forming and sulphite reducing bacteria (Clostridium pcrfringens) found at sites 1 and 2 in the vicinity of the mouth of Czarna Hańcza River lo Lake Wigry. At those places a higher bacteriological pol lution of bottom sediments samples was found.
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Authors and Affiliations

Ewa Korzeniewska
Anna Gotkowska-Plachta
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Abstract

The paper presents the results of studies of sanitary microorganisms' vertical distribution in pelagial and profundal waters of Lake Wigry against the background of thermal-oxygen relations and the presence of a chosen chemical compound in the annual cycle. Total Viable Count at 20°C (TYC 20°C) and Total Viable Count at 37°C (TYC 37°C) were used as indicators of pollution, while Total Coli (TC), Faecal Coli (FC) and Faecal Streptococcus-Enterococcus (FS) - as indicators of the sanitary state. Water samples were collected from 3 sites situated in the centre of the lake. Pelagial and profundal waters showed a little degree of pollution. Higher bacteriological pollution was found in some of waters samples from Lake Wigry at site I in the vicinity of the mouth of the Czarna Hańcza River. The most numerous sanitary microorganisms were detected at the deep from I to 5 meters and above the bottom sediments. Number of FC bacteria was only higher at the depth of 5 meters and deeper. An important positive correlation was noted between temperature and TYC 20°C as well as TYC 37°C, while negative between TC also FC during the whole study period. The oxygen content was correlated negative with TYC 20°C, TYC 37°C and FS. The depth was correlated negatively with TYC 20°C only.
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Authors and Affiliations

Ewa Korzeniewska
Anna Gotkowska-Płachta

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