Table 3. Relative abundance of cells and rank by biovolume of 



diatoms and genera of non-diatom algae in a periphyton 

 sample collected from the mouth of Bear Creek near 

 Gardiner, Montana on July 13, 2000. 



Taxa 



Relative Abundance 



Rank 



Chlorophyta (green algae) 

 Ulothrix 



abundant^ 



Chrysophyta (golden algae) 



Bacillariophyceae (diatoms] 

 Hydrurus foetidus 



dominant 



abundant 



1 

 2 



Cyanophyta (cyanobacteria) ^ 

 Calothrix 

 Oscillatoria 



Phorrni di urn 



occasional 



common 



frequent 



6 

 5 

 4 



^ Only small patches of filamentous green algae were present in 

 Bear Creek. The amount of filamentous green algae in the sample 

 probably overestimates the amount in Bear Creek relative to other 

 algae (Patrick Newby, MDEQ, personal communication) . 



Formerly known as blue-green algae. 



