A stage-structured three-species predator-prey model with Beddington-DeAngelis and Holling II functional response is introduced. Based on the comparison theorem, sufficient and necessary conditions which guarantee the predator and the prey species to be permanent are obtained. An example is also presented to illustrate our main results.
"Permanence of Periodic Predator-Prey System with Functional Responses and Stage Structure for Prey." Abstr. Appl. Anal. 2008 1 - 15, 2008. https://doi.org/10.1155/2008/371632