Table 5. Relative abundance of cells and rank by biovolume of 

 diatoms and genera of non-diatom algae in periphyton 

 samples collected from the Judith River near Lewistown, 

 Montana on August 9, 2000. 



Taxa 



Relative Abundance and (Rank) 

 J 1 J 3 



Chlorophyta (green algae) 

 Anki s trodesrnus 

 Cladophora 

 Coswarium 

 Oedogoniurn 

 Scenedeswus 

 Spirogyra 



Chrysophyta (golden algae) 

 Bacillariophyceae 



Rhodophyta 



Audouinella 



Cyanophyta (cyanobacteria) ^ 

 Calothrix 

 Gloeothece 

 Hydrocoleuiu 

 Merismopedia 

 Oscillatoria 

 Phormidium 



occasional (9) 

 occasional (4) 

 rare (11) 



occasional (10] 



frequent (2) 



common ( 5 ) 



common (3) 



abundant ( 1 ) 



occasional (8) 



occasional (7) 

 common (6) 



occasional (10) 

 frequent (1) 



occasional (7) 

 common (5) 



occasional (9) 

 frequent (3) 



frequent (4) 



rare (11) 



occasional (8) 

 abundant (2) 



occasional (12) 



frequent (6) 



^ Formerly known as blue-green algae, 



