50- 



40- 



(0 

 X 



(D 



!Z30 



o 



0) 



E 

 ^ 20 



10- 



n 1978 Survey 

 ■ 1970 Survey 



I 



12 3 4 



5 6 7 8 9 10 11 12 



Stations 



Figure 8. A comparison of the number of macroinvertebrate taxa collected for the 

 1970 and 1978 South River surveys. 



3000- 



Ji 2000 

 E 



(A 



c 



(0 



o> 

 O 



H- 



o 



I 1000 



Z 



n 1978 Survey 

 ■ 1970 Survey 



1 2 3 4 5 6 7 8 9 10 11 12 



Stations 



Figure 9. Macroinvertebrate density comparison for the 1 970 and 1 978 South River 

 surveys. 



235 



