\ 



a. 



o. 

 o 



J2 



Q. 



a. 



30 ^40 50 60 70 

 PERCENT RESIDUAL PHOTOSYNTHESIS 



FIG. 58 COMPARISON OF TOXIC EFFECTS OF COPPER IN EFFLUENT (0) AND IN 

 SEAWATER (X) ON PHOTOSYNTHETIC RATES OF THALASSIA TESWDINUM. 



134 



