• 



the study results are accurate and reproducible. Upon receipt of 

 the samples, station and sample information were recorded in a 

 laboratory notebook and samples were assigned a unique number 

 compatible with the Montana Diatom Database, e.g., 1056-06. The 

 first part of this number (1056) designates the sampling site 

 (North Fork Teton River at Trailhead) ; the second part of the 

 number (06) designates the number of 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 5, 6, and 7, 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 



All of the following samples were preserved with alcohol. 

 Because of the small numbers of diatoms in these samples, the 

 entire volume of each sample was processed for preparing diatom 

 slides . 



North Fork Teton River at Trailhead (#2). No diatoms were 

 observed in this sample during a 10 minute scan. Diatom slides ■ 

 were not prepared for this sample. The Calothrix in this sample 

 was colonial, lacked heterocysts, and had filaments that extended 

 beyond the sheaths, ending in fine points. This is a reference 

 site for the mountain ecoregions (Bahls et al . 1992) . 



South Fork Teton River above Trailhead (#3) . Only three 

 diatom cells were observed during a 10 minute scan. 



8 



