Appendix B-2. Percent abundance of major diatom species^ and 

 values of selected diatom association metrics for a periphyton 

 sample collected from the Redwater River below the Circle STP in 

 May 1999. Diatom counts performed on replicate diatom slides by 

 Loren Bahls, Hannaea, and Erich Weber, PhycoLogic. Underlined 

 values indicate full support of aquatic life uses with minor 

 impairment; bold values indicate partial support of aquatic life 

 uses with moderate impairment ; vmderlined and bold values 

 indicate nonsupport of aquatic life uses and severe impairment 

 based on criteria for wadeable prairie streams in Table 3 . 



Species /Me trie 



Hannaea 



PhycoLogic 



Diatoma tenue 



69.71 



75.83 



Number of Cells Counted 

 Shannon Species Diversity 

 Pollution Index 

 Siltation Index 

 Disturbance Index 

 Number of Species Counted 

 Percent Dominant Species 

 Percent Abnormal Cells 

 Percent Epithemiaceae 

 Similarity Index 



411 

 2.32 



2 .03 

 10.44 



2.19 

 46 

 69.71 



1.58 

 , 0.24 



!3 .29 



422 

 1.95 

 2.02 

 9.01 

 1.30 



45 



75.83 



0.24 



^ A major diatom species is here defined as one that 

 accounts for 10.0 percent or more of the diatom cells that were 

 counted at one or more stations in a sample set . 



^ PhycoLogic did not count abnormal diatom cells, but did 

 observe deformed valves of Diatoma tenue in the sample (Erich 

 Weber, personal communication) . 



