Values 
Figure 19. 
Species Diversity 
0.9 On Three Beach Segments 
0.8 
-~--- Nourished Beach 
Dot! ——-— Prenourished Beach 
O.6 NN Control Beach 
Collection Dates 
Average Shannon-Weaver Species Diversity on three segments of beach 
during the nourishment period, December 1977 to March 1978. The 
nourished segment was located in the northeastern part of Fort Macon 
and the prenourishment segment was located in the southwestern part 
of Fort Macon. By March there was no longer any part of the pre- 
nourished segment left because nourishment activities had progressed 
that far. The comparison beach was located at Emerald Isle. On the 
starred date in January, no sampling was performed in the surf zone 
due to rough water. Thus values for that date probably represent 
lower estimates of organism density than were actually present. 
The '"bull's-eye" symbol represents periods when species diversity 
was undefined because no organisms were found. 
36 
