Table 4. Relative abundance of cells and rank by biovolume of 

 diatoms and genera of non-diatom algae in periphyton 

 samples collected from E. Rosebud Cr . in August 2000, 



Taxa 



Relative Abundance^ and (Rank) 

 Station 1 Station 2 



Chlorophyta (green algae) 

 Anki s trodesmus 

 Closterium 

 Coswari um 

 Mougeotia 

 Oedogonium 

 Spirogyra 

 Staurastrum 

 Ulothrix 

 Zygnema 



Euglenophyta 



Euglena 



rare (9) 

 rare (6) 



occasional (2) 



occasional (1) 



occasional (5) 

 occasional (4) 



occasional (11] 



occasional (7) 



occasional (8) 



abundant (3) 



dominant (1) 



frequent (4) 



occasional (9) 



rare (lO; 



Chrysophyta (golden algae) 



Diatoms occasional (3) 



abundant ( 2 ) 



Cyanophyta (cyanobacteria) ^ 



Amphithrix occasional (8) 



Mer i smopedi a 



Oscillatoria occasional (7) 



common ( 6 ) 

 frequent (5) 



^ d = dominant; a = abundant; f = frequent; c = common; o 

 occasional ; r = rare 



Formerly known as blue-green algae 



