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 Tables 5 and 6, 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 



Station 1. The sample from this site was very silty and the 

 diatom assemblage was dominated by Navicula species. 



Station 2. The sample from this site was also very silty. 

 The diatom assemblage was dominated by Melosira varians 

 and extremely long "board fences" (filaments) of Fragilaria 

 species (later confirmed to be Fragilaria capucina) . 



NON- DIATOM ALGAE 



The periphyton sample from Station 1 was dominated by 

 chrysophycean algae: diatoms and Vaucheria (Table 5). Although 

 rare, the large green alga Closterium ranked third in biovolume. 

 The cyanobacterium Oscillatoria ranked fourth. 



The filamentous green alga Spirogyra dominated the sample 

 from Station 2 (Table 5) . Oedogonium, another filamentous green, 

 was abundant and ranked second, while diatoms were also abundant 

 and ranked third in biovolume. Two other filamentous green 

 algae-- CI adophora and Moug-eotia- -ranked 4th and 5th. These are 



