Below Daisy Creek (Y04USR03) . Most of the diatoms in this 

 sample were living (contained protoplasm) but a good many are 

 deformed. The bulk of the sample consisted of an orange floe in 

 which fine particles of inorganic sediment were trapped. The 

 matrix of the floe appears to consist of bacterial and algal 

 (including diatom) mucilage. Also present were several short 

 bacterial filaments lying loose in the sample and millions of 

 very tiny (<1 micron diameter) particles (coccoid bacteria?) 

 moving about in Brownian motion. 



Above Wilderness Bo\andary (Y04USR04) . Most diatoms appeared 

 to be alive and diatom diversity was good. The same species of 

 Oscillatoria present upstream was also found here. The species 

 of Phormidium here had very narrow filaments. 



NON- DIATOM ALGAE 



Besides diatoms, the only genus of algae present below Daisy 

 Creek was a cyanobacterium- -Oscillatoria (Table 3). Oscillatoria 

 includes many species that tolerate a wide range of environmental 

 conditions. The very low genus richness below Daisy Creek 

 suggests impairment. Living diatoms were abundant at this site, 

 suggesting that the impairment was not severe. 



Five genera of non-diatom algae were recorded at the site 

 above the Wilderness boundary, including green algae and 

 cyanobacteria (Table 3) . This increase in genetic richness 

 indicates a degree of recovery from the site upstream. The 

 filamentous green alga Mougeotia ranked second in biomass above 

 the Wilderness boundary. Some species of Mougeotia prefer waters 

 with low pH and low conductivity. Diatoms were also abundant at 

 this site and most of the diatoms were living. 



