3 -I 



2 - 



1974 and 1975 



1975 



1974 



¥c 



I2b 



nb 



lb 



Section 



Figure 4. Comparison of diversity indices for 1974 (6 runs) and 

 1975 (3 runs) and combined fall sampling (9 runs) at each primary 

 sampling station on the Tongue River. 



3 -I 



2 - 



1974 and 1975 (r =9932) 



1975 (r = .9889) 



1974 (r = .9480) 



1^ 



I 



BZb 



Eb 



lb 



Section 



Figure 5. Comparison of the Shannon-Weaver diversity indices for 

 1974 and 1975 fall fish sampling in the Tongue River and the combined 

 fall sampling at each of the primary sections excluding fish that were 

 less than 150 mm in length. 



25 



