Permanence for a Discrete Ratio-Dependent Predator-Prey System with Holling Type III Functional Response and Feedback Controls

摘要

A new set of sufficient conditions for the permanence of a ratio-dependent predator-prey system with Holling type III functional response and feedback controls areobtained. The result shows that feedback control variables have no influence on thepersistent property of the system, thus improving and supplementing the main resultof Yang (2008).