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

 diatoms and genera of non-diatom algae in periphyton 

 samples collected from Casino Creek near Lewistown, 

 Montana on August 8, 2000. 



Taxa 



Relative Abundance and (Rank) 

 C 1 C 2 



Chlorophyta (green algae) 

 Anki s trodesmus 

 Cladophora 

 Oedogonium 



Protoderma 



common (3) 



occasional (10) 

 common ( 2 ) 



occasional (7) 

 frequent (4) 



Euglenophyta (euglenoid algae) 

 Euglena 



occasional (9) 



Chrysophyta (golden algae) 



Bacillariophyceae (diatoms) frequent (1) frequent (1) 



Rhodophyta 



Audouinella 



occasional (5) frequent (3) 



Cyanophyta (cyanobacteria) ^ 

 Lynghya 

 Oscillatoria 

 Phormi di um 

 unknown^ 



frequent (2) 



occasional [6] 



common (4) 



occasional (6) 



frequent (5) 

 occasional (8) 



^ Formerly known as blue-green algae. 



^ Thallus is filamentous with false branching; heterocysts 

 lacking; cells elongate oblong, enclosed in a firm sheath, 

 end walls not touching; starch test negative. 



