DESTRUCTION OF ONE SPECIES BY ANOTHER 



127 



33. In a homogeneous microcosm the process of elementary inter- 

 action between the predator and the prey led up to the disappearance 

 of both the components. By making the microcosm heterogeneous 



»» 

 £ 



Homogeneous microcosm without immigrations 

 Bacteria ■+Pa£&*f?oa *^TsU<itunx 



Heterogeneous microcosm without immigrations 

 Bacteria* Parametia •*■ 0£ibk(t7m 



Homogeneous microcosm with immigrations 

 Bacteria -» Paramecin ■+ Pidinium 



prey 



Time — r 



Fig. 33. A schematic representation of the results of a qualitative analysis 

 of the predator-prey relations in the case of two Infusoria. 



(refuge) and thus approaching the natural conditions we began to 

 deal with a "probability" of change in various directions. The preda- 

 tor sometimes dies out and only prey populate the microcosm. By 



