• 



West Fork Ruby River. This sample was very silty an in the process of decomposing 

 (smelled of hydrogen sulfide). 



Non-Diatom Algae 



Coal Creek. Coal Creek supported a diverse mixture of diatoms, green and blue-green 

 algae (Table 3). The xanthophyte Tribonema, which indicates cool water of good quality, was 

 also present at the upstream site. The nitrogen-fixing cyanophyte Tolypothrix, another indicator 

 of cool, clean water, was the dominant alga at the upper site. Other nitrogen-fixing cyanophytes 

 {Anabaena, Nostoc, Nodularia, Rivularia) were also common in Coal Creek, indicating that 

 nitrogen may be the limiting nutrient here. Diatoms ranked first in biovolume at the mouth of 

 Coal Creek in July and the filamentous green alga Cladophora ranked first here in September. 

 Coal Creek supported more genera of non-diatom algae than any of the other streams in the study 

 area (Table 3). 



Indian Creek. The sample from the upper site on Indian Creek contained only diatoms, 

 which were common. Cladophora was most abundant in the sample from the lower site, which 

 also contained diatoms and three genera of cyanobacteria (Table 3). 



Ramshorn Creek. Diatoms were the most abundant algae at both sites on Ramshorn 

 Creek (Table 3). The upper site supported 9 genera of non-diatom algae, including the rare 

 brown alga Heribaudiella and the red alga Audouinella. Both of these genera indicate cool 

 flowing waters of good quality. Diatoms and Cladophora ranked first and second in biomass at 

 the downstream site on Ramshorn Creek, followed by Vaucheria, a xanthophyte that indicates a 

 steady supply of water at this site. 



Currant Creek. Diatoms were the most common algae in the sample from Currant 

 Creek, followed by three genera of cyanobacteria and the desmid Closterium (Table 3). 



