EFFECTS OF FLUCTUATING FLOW RATES 



147 



TABLE 1 



TOTAL GENERIC DISTRIBUTION AND 

 ABUNDANCE PER STATION* 



*Doniinance classes, based on abundance in total samples: 1, 

 dominant (1000+); 2, abundant (500 to 1000); 3, common (50 to 

 500); 4, uncommon (1 to 50). 



and 7). The upstream sites (C-1 and P-1) had lower densities than 

 those downstream (C-2 and P-2). Both density and biomass reached 

 their highest peaks in June at station C-2 (Figs. 5 and 6), where the 

 downstream flow was minimal and the stream was very broad and 

 shallow. At all times density and biomass values were relatively high 

 at C-1 and C-2. No sampling was conducted at Chouteau or Pryor 

 creeks in August because time for sorting the samples collected 

 earlier became limited. 



Another important difference among the stations was the month 

 of maximum density. Maximum density peaks occurred in May at 



