title: A time delay predator-prey system with three-stage-structure.
abstract: A predator-prey system was studied that has a discrete delay, stage-structure, and Beddington-DeAngelis functional response, where predator species has three stages, immature, mature, and old age stages. By using of Mawhin's continuous theorem of coincidence degree theory, a sufficient condition is obtained for the existence of a positive periodic solution.
authors.affiliation: Department of Mathematics, Lvliang University, Lishi, Lvliang City, Shanxi 033001, China.
authors.forename: Qiaoqin
authors.initials: Q
authors.lastname: Gao
authors.affiliation: Department of Mathematics, Shanxi University, Taiyuan, Shanxi 030006, China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Jin
mesh_terms: D000818:Animals; D017753:Ecosystem; D008962:Models, Theoretical; D011235:Predatory Behavior