388 Marine Microbiology 



TABLE 2 



Quantitative Distribution of Azotobacter in the Sediments 

 OF THE Black Sea 



than Azotobacter and in lesser numbers. Between the epiphytic 

 Azotobacter and Phyllophora there exist metabiotic and, perhaps, 

 symbiotic relationships (8). Azotobacter and Clostridium have 

 been found also on Cistoseira, Uha and Enteromorpha inhabit- 

 ing the bays of the Crimea. 



The results of Laboratory experiments ( Table 3 ) showed that 

 the productivity of nitrogen fixation by the strains of Azotobacter 

 using glucose varied from 1.5 to 10.7 mg N per gram of glucose, 

 making up on the average 6.5 mg N/g glucose. The strains of 

 Spirillum had higher levels of nitrogen fixation (from 4.2 to 

 16.1 mg N/g glucose) and on the average it reached 8.7 mg 

 N per 1 g. The activity of nonsporeforming pigmented rods is 



