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    STUDIA BIOLOGIA - Issue no. 1 / 2003  
         
  Article:   STUDII ASUPRA UNOR GRUPE ECOLOGICE DE BACTERII DIN LACUL DE ACUMULARE GILĂU - JUDEŢUL CLUJ.

Authors:  MANUELA-CLAUDIA LUMPERDEANU, MIHAIL DRÄ‚GAN-BULARDA. 		 
       
         
  Abstract:  Studies on Some Ecological Groups of Bacteria from the Gil¾u Dam Lake – Cluj County. The Gil¾u dam lake, the main role of which is to supply with drinking water the city of Cluj-Napoca and the nearby villages, belongs to the dam system of waterfalls located in the upper basin of the Some¿ul Mic river. Based on the well-known key role played by the aquatic microorganisms in the mineralisation of organic residues and in transformation of some inorganic substances, we initiated studies on ten ecological groups of bacteria by analysing water and sediment samples taken from this dam lake. We determined the numbers of the following bacteria: ammonifying, nitrifying (nitrite– and nitrate–producing), denitrifying, aerobic and anaerobic sulphur-reducing, sulphur-oxidising, sulphate-reducing, iron-reducing and amylolytic bacteria. The samples (ten water and seven sediment ones) were taken from different places and depths seasonally (in April, June and October 2002). Results of the analyses indicated that the number of bacteria from each ecological group varied depending on the sampling sites and season. For a general characterisation of the bacteria living in the sediment, we estimated the bacterial indicator of sediment quality (BISQ). The highest BISQ values were obtained in samples collected in the peripheral and tail zones of the dam lake.  
         
     
         
         
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