Most diatoms at all three sites were non-motile autotrophs that tolerate high levels of 

 organic nutrients and indicate fresh waters with low to moderate levels of BOD (Table 5). While 

 most diatoms in Jackson Creek and Granite Creek are alkaliphilous and prefer pH levels above 

 7.0, most diatoms in Jennies Fork prefer somewhat lower pH levels (around 7.0). In Granite 

 Creek, most diatoms exert only a moderate demand for dissolved oxygen, whereas most diatoms 

 in Jackson Creek and Jennies Fork exert a continuously high demand for dissolved oxygen. 

 Also, most diatoms in Granite Creek indicate eutrophic conditions, while most diatoms in 

 Jackson Creek and Jennies Fork tolerate a wide range of trophic conditions from oligotrophic to 

 eutrophic. 



References 



APHA. 1998. Standard Methods for the Examination of Water and Wastewater. 20"'' Edition. American PubHc 

 Health Association, Washington, D.C. 



Bahls, L.L. 1979. Benthic diatom diversity as a measure of water quality. Proceedings of the Montana 

 Academy of Sciences 38:1-6. 



Bahls, L.L. 1993. Periphyton Bioassessment Methods for Montana Streams (revised). Montana Department of 

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Bahls, L.L. , Bob Bukantis, and Steve Tralles. 1992. Benchmark Biology of Montana Reference Streams. Montana 

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Barbour, M.T., J. Gemtsen, B.D. Snyder, and J.B. Stribling. 1999. Rapid Bioassessment Protocols for Use 

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Johansen, J.R. 1999. Diatoms of Aerial Habitats. Chapter 12 i/i Stoermer, E.F., and J.P. Smol (eds.). The Diatoms: 

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John, D.M., B.A. Whitton, and A.J. Brook (eds.). 2002. The Freshwater Algal Flora of the British Isles: An 

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Karr, J. R., and D.R. Dudley. 1981. Ecological perspectives on water quality goals. Environmental Management 

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