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Moderate oxygen demand was the modal category at MCVYCOl , SWMPC02, GOLDC02, 

 FOXC02, DLNOCOl and 03, CHRGCOl, CAMPC02 and 03, and at all stations in Soap Creek, 

 MacLean Creek, Grose Creek, Lost Creek, and Sawlog Creek. At site 01 on Camp Creek, most 

 cells were represented by species that have not been classified with regard to oxygen demand 

 (e.g., Achnanthidium affine). 



Beta-mesosaprobous was the usual level of saprobity at most sites. This represents a 

 dissolved oxygen saturation level of 70-85% and 2-4 mg/L of biochemical oxygen demand 

 (BODs). But saprobity levels were higher or lower than this level at some sites. Sites where 

 most of the diatoms indicated more organic loading (alpha-mesosaprobous) were GOLDC02, 

 CHRGCOl, FRANCO 1, MCLNCOl, LOSTCOl, and SWLGCOl. The alpha-mesosaprobous 

 level corresponds to 25-70% saturation of dissolved oxygen and 4-13 mg/L BOD5. Sites where 

 most of the diatoms indicated less organic loading than usual (oligosaprobous) were DOLTCOl, 

 GOLDCOl, both sites on LaMarche Creek, and CAMPCOl. The oligosaprobous category 

 corresponds to >85% oxygen saturation and <2 mg/L BOD5. 



At two sites the majority of diatoms represented species that prefer lower concentrations 

 of inorganic nutrients than indicated at most of the other sites. Site 01 on LaMarche Creek 

 (LMCHCOl) was dominated by oligotraphentic diatom species (e.g., Aulacoseira alpigeiui). 

 Oligotraphentic is the lowest (least enriched) nutrient category. Site 02 on McVey Creek 

 (MCVYC02) was dominated by meso-eutraphentic species (e.g., Staurosira construens). Meso- 

 eutraphentic is the next level below (less enriched than) eutraphentic. 



