Table 4. Percent abundance of major diatom species^ and values 

 of selected diatom association metrics for periphyton 

 samples collected from the Stillwater River on 8/25/01. 



Species/Metric Percent Abundance/Metric Values^ 



(Autecology) ^ Below Daisy Creek Wilderness Boundary 



Achnanthidium minutissimum (tol) 27.04 



Cymhella cistula (eu) 



Encyonema winutum (tol) 



Encyonema silesiacuw (tol) 



Meridian circulars (eu) 



Staurosira construens (tol) 



Cells Counted 



Total Species 



Species Counted 



Species Diversity 



Percent Dominant Species 



Disturbance Index 



Pollution Index 



Siltation Index 



Percent Abnormal Cells 



Percent Epithemiaceae 



Similarity Index 58.27 



"■ A major diatom species is one that accounts for 3% 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 2 . 



^ Autecology 



eu: best growth in stronger mesotrophic to eutrophic waters 



tol: tolerant of a wide range of trophic status from oligo- 

 to eutrophic waters without discernible preference 



Sources: Lange-Bertalot , H. 1979. Pollution Tolerance of 



Diatoms as a Criterion for Water Quality Estimation. 

 Nova Hedwigia, Beiheft 64, pp. 285-304. 



Lange-Bertalot, H. 1996. Red List of Limnic 

 Diatoms (Bacillariophyceae) in Germany. Schr.-R. f. 

 Vegetationskde, H. 28, pp. 633-677. BfN, Bonn-Bad 

 Godesberg. 



