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Multiple periodic solutions of delayed predator-prey systems with type IV functional responses

机译:具有IV型功能反应的时滞捕食者-食饵系统的多重周期解。

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In this paper, we considered a periodic predator-prey system with a type IV functional response, which incorporates the periodicity of the environment. Sufficient conditions for the existence of multiple positive periodic solutions are established by applying the continuation theorem. This is the first time that multiple periodic solutions are obtained by using the theory of coincidence degree. Moreover, unlike other types of functional responses, a type IV functional response declines at high prey densities. Thus the existing arguments for obtaining bounds of solutions to the operator equation Lx=lambdaNx are inapplicable to our case and some new arguments are employed for the first time. (C) 2003 Elsevier Ltd. All rights reserved.
机译:在本文中,我们考虑了具有类型IV功能响应的周期性捕食者-被捕食者系统,其中包含了环境的周期性。通过应用连续定理,建立了多个正周期解存在的充分条件。这是首次使用重合度理论获得多个周期解。而且,与其他类型的功能性反应不同,IV型功能性反应在高猎物密度下会下降。因此,用于获得算子方程Lx = lambdaNx的解的范围的现有参数不适用于我们的情况,并且首次采用了一些新参数。 (C)2003 Elsevier Ltd.保留所有权利。

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