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

 diatoms and genera of non-diatom algae in periphyton 

 samples collected from Spring Creek near Choteau, 

 Montana on August 1, 2 000. 



« 



Taxa 



Relative Abundance and (Rank! 

 S-2 S-3 



Chlorophyta (green algae) 



Anki s trodeswus 



Bulbochaete 



Chaetophora 



Closterium 



Cosmarium 



Mi crospora 



Mougeotia 



Oedogonium 



Pediastruin 



Protoderma 



Scenedesmus 



Spirogyra 



Zygnema 



Chrysophyta (golden algae) 



Bacillariophyceae (diatoms) 



occasional (13) 

 occasional (9) 



abundant ( 2 ) 

 occasional (11) 

 rare (15) 



common (7) 

 freqxient (4) 

 occasional (12) 

 occasional (10) 

 occasional (14) 

 frequent (5) 

 abundant (3) 



abundant ( 1 ) 



common (3^ 



occasional (7; 



common (2) 

 rare (6) 



occasional (9) 



• 



abundant ( 1 ) 



Rhodophyta (red algae) 

 Audouinella 



rare ( 8 ) 



Cyanophyta (cyanobacteria) ^ 

 Calothrix 

 Meri smopedia 

 Rivularia 



occasional (8) 



common (6! 



occasional (5) 

 common (4) 



Formerly known as blue-green algae 



