3 r- 



^ 2 



H (diversity) 



J ( evenness ) 



Li 



4 r- 



H " ( diversity ) 



J ( evenness ) 



197 



J I 



o 



1972 



1973 



Figure 10. 



Species diversity and evenness for the worm fauna (upper 

 graph) and the total fauna (lower graph) at the control 

 station. 



36 



