[Initiation of auto-oscillations in a distributed system with multiple equilibria]

Possible alterations in time of population numbers due to abrupt nonuniformity of environmental conditions were shown by a mathematical model. Elimination of borders between the local systems with stable uniform regimes results in the appearance of auto-oscillations of large amplitude in the whole region. The effect is interpreted in terms of the consequences of applying chemicals for pest control, and of chemotherapy influence on the immune system as well.