648 



Marine Microbiology 



continuity shown in table 1, indicated a 28 per cent reduction 

 of the NHs-N by nitrification. 



Phosphate concentrations in surface waters of the bay have 

 been observed on more recent cruises made by the Allan Han- 

 cock Foundation (AHF Stations 5505; 5536; 5538; 5728-39; and 

 6985-94). The average surface distribution of PO^-P indicates that 

 an area of 138 km^ was affected by the discharge. Surface tem- 

 peratures varied generally between 14 and 16 C. 



A rate of phosphorus mineralization can be computed from 

 the surface distribution of POi-P and a simplified treatment of 

 the time-area-volume relationships within the effluent field. As- 

 sume that areas within the roughly bell-shaped surface Pd-P iso- 



20 30 



HOURS 



Fig. 3. Total phosphate phosphorus in effluent field. 



