On completion of the project, station information, sample 

 information, and diatom proportional count data will be entered 

 into the Montana Diatom Database . 



RESULTS AND DISCUSSION 



Results are presented in Figure 1 and Tables 4 through 7, 

 which are located near the end of this report following the 

 Literature Cited section. Spreadsheets containing completed 

 diatom proportional counts, with species' pollution tolerance 

 classes (PTC) and percent abundances, are attached as Appendix A. 



SAMPLE NOTES 



Blackfoot River. Deformed diatom valves were noted in all 

 three of the periphyton samples from the upper Blackfoot River. 



Arras tra Creek. Algae were very sparse in the sample from 

 AraC-01, and the usually colonial alga Hydrurus was present only 

 as individual cells. This implies that algal colonization and 

 succession at this site were at a very early stage. 



Poorman Creek. All three of the samples from Poorman Creek 

 were dominated by moss. Spirogyra in the sample from PoorC-03 

 was senescent. 



Willow Creek. The sample collected at WilC-01 was dominated 

 by moss. Ulothrix zonata was the species of Ulothrix present at 

 WilC-02. 



Sandbar Creek. The sample from SbrC-01 was dominated by 

 moss . Algae were sparse and diatoms were very sparse in the 

 sample from SbrC-02. 



