Non-Diatom Algae 



Dog Creek. Seven genera of cyanobacteria dominated the sample from Dog Creek and 

 were the only non-diatom algae present (Table 3). Diatoms were common and ranked 4" in 

 biovolume. Green algae, including filamentous macroalgae, were conspicuously absent from 

 this sample. 



Eagle Creek. The upper site on Eagle Creek supported a diverse assortment of 13 genera 

 of yellow-green algae, green algae, cyanobacteria, and euglenoid algae (Table 3). The sample 

 was dominated by two genera of yellow-green algae (Tribonema and Vaucheria) that indicate 

 cool water temperatures and constant flows. Filamentous green algae were also abundant here. 

 As a group, diatoms were frequent and ranked fifth in biovolume among the genera. 



Six genera of non-diatom algae were found in the sample from the middle site on Eagle 

 Creek and all but one of these were green algae (Table 3). Tribonema was present here but it 

 was much less abundant than it was upstream. Diatoms were abundant and ranked 1 st in 

 biovolume. 



Chara, a plant-like green alga with erect stems, dominated the sample from the lower site 

 on Eagle Creek and was the only non-diatom alga present (Table 3). Chara prefers alkaline 

 waters and is found mostly in ponds and stream backwaters with muddy bottoms and little or no 

 current. Diatoms were common here and ranked a distant 2 n in biovolume. 



Diatoms 



Four of the major diatom species in Dog Creek and Eagle Creek are sensitive to organic 

 pollution and all four were abundant only at the upper and middle sites on Eagle Creek (Table 4). 

 Six of the major species are somewhat tolerant of organic pollution and these were present at all 

 sites. The 3 major diatom species that are most tolerant of organic pollution were present only 

 in Dog Creek and at the lower site on Eagle Creek (Table 4). Navicula vilaplanii, a new species 

 just described in 2000, is usually found in eutrophic waters with average to higher conductivity 



