Participation of MEM+ bacteria in the bacterioplankton community in Ustka harbor, the River S?upia estuary, Southern Baltic Sea

摘要

The number of bacteria was studied in the waters of the harbor canal in Ustka at the Baltic Sea. The studies were conducted with the use of the fluorescence microscope via live/dead method that differentiates the cells with the disintegrated membrane and live cells. The studies were conducted in a seasonal cycle at four research sites that differed in salinity and in the force of the influence of the marine environment. In all estuary zones the high percentage of dead bacteria (over 80%) was observed. The significant differences in number among particular sites were not observed. The relation between the number of live bacteria and the concentration of chlorides and organic matter was not demonstrated. It was showed that the number of bacteria falls within the greater seasonal fluctuation in the limnetic zone than in other estuary zones. Moreover, the very clear seasonal fluctuation of the studied parameters was observed. The maximum number of bacteria was stated in winter in the period of the lowest insolation.