研究一类具有时滞和基于比率的三种群捕食-食铒二斑块系统,利用重合度理论的连续定理建立了这类系统的周期解的存在性判据.%In this paper, a three-species ratio-dependent predator-prey diffusion model with time delay in a two-patch environment is studied. Using the continuation theorem of conincidence degree theory, the existence of a positive periodic solution for above model is established.
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