Figure 16. 
Chlorophyll- 
rich continen- 
tal shelf waters 
off the U.S. 
East Coast 
contrasted 
with less pro- 
ductive off- 
shore water. A 
Gulf Stream 
ring is forming 
in the right 
center of the 
image. 
(Courtesy of O. 
Brown and R. 
Evans) 
25 
