LU 

 O 

 < 



G 



LL 



o 

 b 



12 

 11 



10 

 9 

 8 

 7 

 6 

 5 

 4 

 3 

 2 

 1 



8 

 7 

 6 

 5 

 4 

 3 

 2 

 1 



Fore Reef 



u 



I ' ' ' 'I I I I I 



Back Reef 



n m n i n n im 



to. 



25 30 35 40 45 50 55 60 65 70 75 80 85 



TEST DIAMETER [mm! 



Figure 1. --Frequency distribution of size classes (mm) for Diadema occurring 

 on the fore reef (top) and back reef (bottom) of St. Croix; N = 106 for 

 each site. 



threespots and Diadema was strongest, and Diadema density varied inversely with 

 damselfish density on the back reef. 



Although the volume of A. palmata per stand differed in the two habitats, 

 the heights of A. palmata stands were not significantly different (table 1). 

 However, within A. palmata stands on the fore and back reefs, the vertical 

 distribution of Diadema was found to differ significantly (table 2). A large 



143 



