Q. 



a. 



z 



O) 

 CO 



o 



250 



500 



10^ ha 



Figure 1. The relationship between the area of wetland vegetation in each 

 hydrologic unit in south Louisiana and the commercial yields of shrimp 

 caught therein (adapted from Turner 1977). 



1000 



100 



< 

 I 



o 



10 



Coeficient of Determination (R^) - 0.54 



_,„ -.07(x) 

 y-1 57e ' ' 



10 



20 

 LATITUDE 



30 



40 



Figure 2. The relationship between the yield of penaeid shrimp per area 

 of coastal vegetation (kg/hectare) and latitude. Only commercial quanti- 

 ties were evaluated; the areas are for states in the U.S. and various 

 countries throughout the world (adapted from Turner 1977). 



113 



