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    STUDIA BIOLOGIA - Issue no. 1 / 2007  
         
  Article:   THE QUANTITATIVE VARIATIONS OF SOME ECOPHYSIOLOGICAL GROUPS OF BACTERIA FROM THE SEDIMENTS OF THE CRIŞUL ALB RIVER.

Authors:  MARIOARA NICOLETA FILIMON, MIHAIL DRĂGAN-BULARDA.
 
       
         
  Abstract:  Sediment samples from the Crişul Alb River was taken and submitted to microbiological analyses during 2005. We have determined five ecophysiological groups of bacteria: ammonifying, nitrifying, denitrifying, iron-reducing bacteria, sulfate-reducing bacteria. In all sediment samples taken, bacteria from all of the 5 ecophysiological groups were found. The order of their abundance in the water was: ammonifying > denitrifying > nitrifying > iron-reducing > anaerobic sulfate-reducing bacteria. Based on the values of the bacteria from each ecophysiological group we determined the bacterial indicator of the sediment quality (BISQ) and we observed its seasonal variations. The seasonal values of the BISQ increase from the winter to the autumn. Regarding the sampling points we observed that the lower values of BISQ in all seasons of 2005 are registered downstream Buteni, due to the chemical pollution of the river in this locality.  
         
     
         
         
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