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Bacteriological investigations of bijela and crna rivers and some plitvice lakes yugoslavia

Bacteriological investigations of bijela and crna rivers and some plitvice lakes yugoslavia

Acta Botanica Croatica 38: 79-86

The number of saprophytic bacteria and the presence of some physiological groups of bacteria were examined in the supplying waters of Plitvice Lakes, and in some of the Upper and Lower lakes in the autumn, 1977 and in the spring and autumn, 1978. One of the main supplying waters of Lake Proscan, the Crna river, does not display signs of pollution, while the Bijela river, following bacteriological parameters (Escherichia coli and Clostridium perfringens), is constantly polluted by domestic waste waters. The presence and a more significant representation of the groups of proteolytic and phosphomineralizing bacteria than in other parts of the examined region, point not only to the enlarged concentrations of organic N and P compounds in the river water, but also a possibility of hastening the processes of eutrophilication, as a result of their mineralization. Consequently, the water of the Bijela river, which after joining the Crna river flows into Lake Proscan as Matica, would be one of the important factors for speeding the eutrophilication processes in the lake, especially in the zone of the river mouth. Relatively low values of all the groups of bacteria were found in the upper and lower lakes, which can be the result of dilution of more polluted supplying waters and the processes of self purification. The mean values of number of saprophytic bacteria on MPA [meat peptone agar] in the lakes ranged from 225 (in spring) to 1480 (in autumn) ml. The number of bacteria of the investigated groups increased considerably in autumn, probably as a result of larger quantities of dead organic matter in the lakes. The bacteriological analysis of samples of shallow waters from the littoral of Lake Galovac, where a thick layer of fallen leaves and reed stems decayed (autumn, 1978), showed high numbers of bacteria of all groups, which is a sign of intensive decomposition and mineralization of dead plant material.

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