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The threshold of survival for predator-prey Volterra system of three species in a polluted environment. (English) Zbl 0848.92020

Summary: The effects of toxicants on two kinds of Volterra systems have been studied. One is a community consisting of two competitive predators and one prey; the other of one predator and two competitive preys. The thresholds between persistence and extinction for each population have been obtained.

MSC:

92D40 Ecology
34C99 Qualitative theory for ordinary differential equations
34D99 Stability theory for ordinary differential equations
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