5-, 



<: 



ki 



I- 



300 500 700 900 

 PSU Size 



100 1300 



Figure 4-5. Photosynthetic Efficiency (a) Per g Chlorophyll as a 

 Function of PSU (Photosynthetic Unit) Size for 

 Marine Phytoplankton, from Perry et al . (1981) 



4-14 



