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



diatoms and genera of non-diatom algae in a periphyton 

 sample collected from Mol Heron Creek near Corwin 

 Springs, Montana on July 14, 2000. 



Taxa 



Relative Abundance 



Rank 



Chlorophyta (green algae) 

 Cladophora 

 Closterium spp . 

 Ulothrix 



dominant^ 

 common 

 common^ 



1 



5 



3 



Chrysophyta (golden algae) 



Bacillariophyceae (diatoms] 

 Cyanophyta (cyanobacteria) ^ 



Anajbaena 



Oscillatoria 



Phoimidium 



abundant 



occasional 



occasional 



frequent 



7 

 6 

 4 



^ Only small patches of filamentous green algae were present in 

 Mol Heron Creek. The amount of filamentous green algae in the 

 sample probably overestimates the amount in Mol Heron Creek 

 relative to other algae that were present (Patrick Newby, MDEQ, 

 personal communication) . 



Formerly known as blue-green algae. 



