Table 1. --Comparison of communities on fore and back reefs at St. Croix, 



U.S. V.I. Data are means (+ SE) and were tested with Wilcoxon rank sum tests 

 (Z statistic) for all tests except for algal lawn, where a t test was used. 



Fore Reef Back Reef Test Statistic P 



3 

 A_. palmata (m ) 



Volume 9.5(1.3) 16.79(2.52) Z = 1.75 0.04 



N 3 3 



A. palmata (m) 



Height 1.42(.03) 1.5(.05) Z = 1.03 n.s. 



N 3 3 



A. palmata (m) 



Width 1. 87( . 19) 2.63(.28) Z = 1.75 0.04 



N 3 3 



Threespot Density 



No. ind.m" 3 0.3K.04) 0.18(.01) Z = 1.75 0.04 



N 3 3 



Diadema Density 



No. ind.m" 3 5.04(1.86) 2.30(.47) Z = -1.75 0.04 



N 3 3 



Algal lawn 



(cm 2 ) 349.11(44.57) 146.11(12.89) t = -4.38 < 0.002 



N 9 9 



142 



