Table 5. Percent abundance of major diatom species^ and values 

 of selected diatom association metrics for periphyton 

 samples collected from Mill Creek, Pine Creek, and Tom 

 Miner Creek in the summer of 2000. 



2 



Species/Metric Percent Abundance/Metric Values 



;Pollution Tolerance Class) ^ 



Mill Cr. Pine Cr . Tom Miner Cr. 



Sta. 1 Sta. 1 Sta. 1 Sta. 2 



Achnanthes minutissirna (3) 5.36 13.38 5.76 6.26 



CyTnjbella silesiaca (2) 8.60 0.25 1.32 1.06 



Fragilaria construens (3) 6.48 2.40 2.25 



Fragilaria vaucheriae (2) 3.87 12.11 10.76 



Gomphonema angustatum (2) 0.87 11.00 0.24 0.35 



Gomphonema olivaceoid.es (3) 5.49 62.25 2.40 2.72 



Hannaea arcus (3) 28.30 3.25 1.80 0.71 



Navicula cryptotenella (2) 1.50 0.50 7.31 6.50 



Nitzschia dissipata (3) 1.75 20.98 15.37 



Nitzschia paleacea (2) 7.61 5.16 1.89 



Cells Counted 401 400 417 423 



Total Species 52 25 65 69 



Species Counted 47 25 54 62 



Species Diversity 4.12 2 .08 4.50 4.80 



Percent Dominant Species 28 .30 62.25 20.98 15.37 



Disturbance Index 5.36 13.38 5.76 6.26 



Pollution Index 2.65 2.86 2 .42 2 .41 



Siltation Index 22.44 2.25 54.93 50.50 



Percent Abnormal Cells .62 0.00 . 60 . 59 



Percent Epithemiaceae 0.00 0.00 0.00 0.00 



Similarity Index 21.84 78.86 



^ A major diatom species is here considered to be one that 



accounts for 5% or more of the cells in one or more samples of 

 a sample set. 



^ Underlined values indicate good biological integrity, minor 



impairment, and full support of aquatic life uses; bold values 

 indicate fair biological integrity, moderate impairment, and 

 partial support of aquatic life uses,- all other values 

 indicate excellent biological integrity, no impairment, and 

 full support of aquatic life uses when compared to criteria 

 for mountain streams in Table 3 . 



^ 3 = sensitive to pollution; 2 = tolerant of pollution; 

 1 = most tolerant of pollution. 



