200 



i rr 



200 250 300 350 400 



m w 



Fig. 3. Accumulation of phenol in model communities. 



Abscissa - days from the beginning of the 

 experiment. Ordinate - concentration of 

 phenol in mg/1. 1-5 - numbers of aquaria. 

 Vertical broken lines separate the periods 

 differing in amount of phenol (mg) added 

 per liter of medium: 1-1 mg/1; 2-5 mg/1; 

 3-10 mg/1; 4-0 mg/1. Thick continuous lines 

 concentration of phenol in various aquaria. 



191 



