5 4 

 >. 



■D 



I 2 



> 



T3 

 O 

 O. 

 > 



E 

 a 



Desert Dry agriculture Moist 



Estuarine Coastal Open ocean 



Figure 3. A comparison of primary productivity for different kinds of ecosystems 

 (adapted from Teal and Teal 1969). 



