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    STUDIA BIOLOGIA - Issue no. 2 / 2005  
         
  Article:   CERCETĂRI MICROBIOLOGICE ASUPRA UNOR SEDIMENTE DE PE CURSUL MIJLOCIU AL RÂULUI MUREŞ.

Authors:  VASILE MUNTEAN, LIDIA CORINA ŞTEF, MIHAI DRĂGAN-BULARDA. 		 
       
         
  Abstract:  Microbiological Research on Sediments from the Middle Sector of the Mureş River. Eight sediments from the Mureş river between Răstoliţa and Alba Iulia were studied microbiologically, during the four seasons of the year 2001. The following five ecophysiological bacterial groups have been studied: aerobic mesophilic heterotrophs, ammonifiers, denitrifiers, desulphofiers and iron-reducers. The presence of all the five ecophysiological bacterial groups was registered in all the studied sediments. The descending ranking of their abundance was: aerobic mesophilic heterotrophs > ammonifiers > denitrifiers > desulfofiers ≡ iron-reducers. Based on the bacteria number of each ecophysiological groups, the bacterial indicators of sediment quality (BISQs) were calculated. The BISQ values were lower upstream, and increased at the sites located in the hilly sector of the river, between Târgu Mureş and Alba Iulia. The values of the BISQ were also higher in summer and autumn as compared to spring and winter. A positive correlation has been established between the enzymatic indicator, the bacterial indicator and the content of organic matter in the studied sediments.  
         
     
         
         
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