Note: For reference purposes. Table 3 shows the families or genera of bottom fauna collected 

 during the study by Spence (1975) whether or not they were found at the stations sampled during 

 the current study. 



Figure 1 illustrates the total numbers of bottom fauna. Figure 2 the number of bottom fauna per 

 square foot and Figure 3 the number of bottom fauna genera before and after failure of the 

 tailings dam. 



A newly constructed beaver dam had flooded out the Pop's Place station sampled in 1971 and 

 1972. Therefore, the 1975 sample site was moved about 100 feet upstream from the previous site 

 and on a similar substrate type. 



Species Diversity 



Species diversity indices are used to analyze the structure of a biological community through the 

 use of information theory (Newell 1976a). In analyzing community structure, information 

 theorists ask how much new knowledge or "information" about species composition can be 

 obtained by drawing individuals at random (Newell 1976a). As sample size increases, the 

 diversity of the pooled samples increases rapidly at first, then levels off. Since diversity of 

 individual scimples is highly variable, it is preferable to report the diversity of the pooled samples 

 (Newell 1977). 



