PREDATION AND EFFICIENCY IN LABORATORY POPULATIONS 229 



Fig. 3. — The relation between residual population size (Pp) per unit food and the intensity of 

 predation (F) when adult animals are selectively taken as yield (D. pukx). 



YIELD AS ANIMALS+ EGGS. ADULT REMOVAL 



« 9 10 



Fig. 4. — The relation between yield per unit food per four days and F when adult animals are 



selectively taken (D. pukx). 



