compatible with the Montana Diatom Database, e.g., 1806-01. The 

 first part of this number (1806) designates the sampling site 

 (Painted Robe Creek at Buffalo Highway) ,- the second part of the 

 number (01) designates the number of periphyton periphyton 

 samples that have been collected at this site to date for which 

 data have been entered into the Montana Diatom Database. 



Sample observations and analyses of soft (non-diatom) algae 

 were recorded in a lab notebook along with station and sample 

 information provided by MDEQ . A portion of the raw sample was 

 used to make duplicate diatom slides. 



On completion of the project, station information, sample 

 information, and diatom proportional count data will be entered 

 into the Montana Diatom Database. One set of diatom slides will 

 be deposited in the University of Montana Herbarium in Missoula. 

 The other set of slides will be retained by Hannaea in Helena. 



RESULTS AND DISCUSSION 



Results are presented in Tables 4 and 5, 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 calculated 

 percent abundances, are attached as Appendix A. 



SAMPLE NOTES 



Painted Robe Creek at Lehfeldt (PRl-3). This sample was 

 very silty. The Vaucheria was covered with diatom epiphytes. 

 About half the diatom cells were empty. 



Painted Robe Creek at L. Paulson Road (PR2-1) . The sample 

 from this site contained very little silt. The Cladophora here 

 was densely covered with the diatom Rhoicosphenia curvata. About 

 10% of the diatom cells were empty. 



Painted Robe Creek at Buffalo Highway (PR2-3) . The sample 



was very silty. About 20% of the diatom cells were empty. 



Painted Robe Creek near mouth (PR2-14) . The sample was 

 relatively free of silt. The bulk of this sample was an 

 unidentified macrophyte . About 10% of the diatom cells were 

 empty . 



