CIRCULATION AND RESPIRATION 



57 



c 

 o 



E 



O 



I 2 3 4 5' 



Oxygen concentration, m' /L 



I 2 3 4 5 6 



Oxygen concentration, mL/l 



^ 



5 - 



1 ^ 



10 



c 

 o 

 o 2 



O 



Oxygen concentration, ml/L 

 6 



I 2 3 4 5 6 



Oxygen concentration, ml/L 



2 3 4 5 6 



Oxygen concentration, ml/L 



Fig. 29. Oxygen consumption of various species of leech at 

 20°C at various oxygen concentrations. From Mann, 1956. 



