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

 diatoms and genera of non-diatom algae in periphyton 

 samples collected from Cottonwood Creek on 8/21/01: 

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

 o = occasional; r = rare. 



• 



Chrysophyta (golden algae) 



Diatoms a/3 a/2 a/2 



Tribonema o 



Rhodophyta (red algae) 



Audouinella c/4 o 



Cyanophyta (cyanobacteria) ^ 



Amphithrix 0/6 



Anahaena o f/5 



Calothrix r r o 



Lyngbya f/6 



Merismopedia o 



Nostoc o 



Oscillatoria a/2 o 



Phorwidium 000 



Rivularia o/9 



Formerly known as blue-green algae 



