共查询到20条相似文献,搜索用时 15 毫秒
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THE MATHEMATICAL BEHAVIOR OF A NONAUTONOMOUS VOLTERRA PREDATOR-PREY SYSTEM WITH UNDERCROWDING EFFECT
1IntroductionWeconsidertheVolterapredatorpreymodelwithLogisticpreygrowthrate:x=ax(K-x)-bxy,y=-cy+dxy-αy2.(1.1)Thismodelhasau... 相似文献
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A model of a predator-prey system with diffusion and predator resource is studied. Both constant and variable resources are considered. In the absence of diffusion, criteria for local stability, instability, and global stability of equilibria, as well as persistence and extinction, are obtained. It is shown that an otherwise unstable uniform equilibrium state may be stabilized by diffusion. 相似文献
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In this paper,a set of suffcient conditions which ensure the permanence of a nonlinear periodic predator-prey system with prey dispersal and predator density-independence are obtained,where the prey species can disperse among n patches,while the density-independent predator is confined to one of the patches and cannot disperse. Our results generalize some known results. 相似文献
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In this paper, we consider a predator-prey system with stage structure and harvesting (where the predator population has two stages, an immature stage and a mature stage with harvesting, and the growth of the prey population is of Lotka-Volterra nature). We obtain the conditions of the globally asymptotic stability for three nonne-gative equilibria of this system. 相似文献
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杨明朝 《高校应用数学学报(英文版)》2003,18(3)
§ 1 IntroductionA predator-prey system with undercrowding effectis studied in [1 ] ,dxdτ=x(x -l) (1 -x)m + x -xy,dydτ=ny(x -g0 ) ,(1 )where m,n,g0 and l are non-negative constants.There are singular points O(0 ,0 ) ,A(l,0 )and B(1 ,0 ) in system (1 ) .As g0 locates between 1 and l,system (1 ) has a unique positivesingular point C(g0 ,(g0 -l) (1 -g0 )m+ g0) .Without loss of generality,assume l相似文献
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Tingting Li 《应用数学年刊》2017,33(3):289-307
A predator-prey system with a constant proportion of prey refuge and stage-structure for prey species is proposed and studied in this paper. A set of conditions for the permanence of the system is obtained. The local stability of the system is discussed by the sign of eigenvalues. Furthermore, by using the iterative method, some suitable sufficient conditions for the global attractivity of the interior equilibrium is obtained. Our study shows that the constant proportion of prey refuge could lead to more complicate dynamic behaviors. Numerical simulations are also presented to illustrate the feasibility of the main results. 相似文献
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1IntroductionIfl1939,N.N.Bautill[1,2]studiedasystemofcouplednolllilleardifferelltialequations'whichhasseverall'eaturcsofinterestforthestudyofchemicaloscillations.M*-L.Sinoes[3]showedthatfurthertheBautinsystemisaveryadequatemodelforchemicaloscillations,the… 相似文献
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Bai Zijun Yang Wensheng Li Xuepeng 《Annals of Differential Equations》2007,23(4):386-390
In this paper,we study some predator-prey system with Allee effect for prey. In addition,we discuss the properties of equilibrium points and the existence and uniqueness of limit cycle. 相似文献
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In this paper, we study a predator-prey model with prey refuge and disease. We study the local asymptotic stability of the equilibriums of the system. Further, we show that the equilibria are globally asymptotically stable if the equilibria are locally asymptotically stable. Some examples are presented to verify our main results. Finally, we give a brief discussion. 相似文献
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Jinhuang Chen 《应用数学年刊》2018,34(1):32-46
A nonautonomous modified Leslie-Gower predator-prey model with nonmonotonic functional response and a prey refuge is proposed and studied in this paper. Sufficient conditions which guarantee the permanence, extinction of the prey species and the global stability of the system are obtained, respectively. Also, by constructing a suitable Lyapunov function, some sufficient conditions are obtained for the existence of a unique globally attractive positive almost periodic solution of this model. Our results indicate that the prey refuge has positive effect on the coexistence of the species. Examples together with their numeric simulation show the feasibility of our main results. 相似文献
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有食饵补充的二维捕食食饵模型的周期解与概周期解 总被引:9,自引:0,他引:9
对于有食饵补充的非定常二维捕食食饵模型,利用微分不等式,讨论了周期解的存在性及其全局吸收性,概周期解的存在性及其在壳扰动不的稳定性。 相似文献
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本文利用奇点理论与Bendixson定理对淋病扩散模型进行了定性分析,给出了可行平衡点附近,特别是高阶平衡点附近轨线的定性结构,研究了可行平衡点的全局渐近稳定性,得到了完整的结果。 相似文献
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本文中,我们考虑一类带有扩散和时滞的捕食与被捕食系统.我们分析了系统的非负不变性,边界平衡点性质,全局渐近稳定性及永久持续生存性.在这一系统中,当时滞由0变到ro时,系统在平衡点附近发生Hopf分支.即当r增加通过临界值ro时,从正平衡点分支出周期解. 相似文献
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具有扩散和比率依赖的三种群混合模型的分析 总被引:2,自引:0,他引:2
本文讨论了捕食者具有比率依赖的功能性反应,食饵与另一种群竞争且自身可以 扩散的混合模型.证明了系统一致持久与扩散有关,而且得到了系统存在全局吸引周期 解的充分条件. 相似文献
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Abstract The study of three‐species communities have become the focus of considerable attention, and because the studies of ecological communities start with their food web, we consider a tritrophic food chain model comprised of the prey, the predator, and the super‐predator. The classical assumption of the domino effect is supplemented with an adaptive parameter for the predator (in the absence of prey). Thus, the model exhibits an equilibrium with the predator‐top‐predator steady state, which is a saddle point. Dynamical behaviors such as boundedness, existence of periodic orbits, persistence, as well as stability are analyzed. The long‐term coexistence of the three interacting species is addressed, and the stability analysis of the model shows that the biologically most relevant equilibrium point is globally asymptotically stable whenever it satisfies a certain criterion. Practical implications are explored and related to real populations. 相似文献
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本文研究了一类比率依赖的捕食者-食饵模型的Hopf分支问题,运用吴建宏等人利用等变拓扑度理论建立起的一般泛函微分方程的全局分支理论,得到了由系统的正平衡点分支出来的周期解的全局存在性,最后利用数值模拟验证了理论分析的正确性. 相似文献
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本文研究了一类具有垂直传染和接触传染的传染病模型.利用常微分方程定性与稳定性方法,分析了该模型非负平衡点的存在性及其局部稳定性.同时,利用LaSalle不变性原理和通过构造适当的Lyapunov函数,获得了平凡平衡点、无病平衡点和地方病平衡点全局渐近稳定的充分条件.结果表明当基本再生数小于等于1时,所有种群趋于灭绝;当基本再生数大于1和病毒主导再生数小于1时,病毒很快被清除;当基本再生数大于1和病毒主导再生数大于1以及满足一定条件时,病毒持续流行并将成为一种地方病. 相似文献
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In this paper,a predator-prey model of three species is investigated.By introducing a delay as a bifurcation parameter,it is found that Hopf bifurcation occurs when τ crosses some critical values. 相似文献