engleski

Percentage of gelatinolytic bacteria among heterotrophic bacteria as indicator of water quality

The relationship between the physiological group of gelatinolytic bacteria and the abundance of heterotrophic bacteria in freshwater ecosystems was described. A thousand eighty two different freshwater samples in Croatia were tested. Percentages of gelatinolytic bacteria among the population of heterotrophic bacteria showed a significant negative correlation with the abundance of heterotrophic bacteria. The percentage of the physiological group of gelatinolytic bacteria among the population of heterotrophic bacteria, as a parameter, can serve as an indicator of the pollution degree of freshwaters. The high percent of gelatinolytic bacteria ( 76 %) always indicated the colony forming units of heterotrophic bacteria below 1000/mL, corresponding to the high water quality. The percent of gelatinolytic bacteria lower than 11 % indicated different polluted waters, which needs a water treatment to be used for certain purposes. Isolated strains of aerobically grown gelatinolytic bacteria were gram-negative rod-shaped or gram-positive endospore-forming rod-shaped cells.

gelatinolytic bacteria; heterotrophic bacteria; water quality

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