模糊随机时滞Lotka-Volterra模型的持久性和渐近性

给出模糊随机时滞Lotka-Volterra模型,通过Ito公式,在一定条件下研究模型(1.2)的随机持久性,利用指数鞅不等式进一步给出了解的渐近估计.最后,通过两个数值算例对主要结果进行验证.     

Global attractivity of positive periodic solution to periodic Lotka-Volterra competition systems with pure delay

We consider a periodic Lotka-Volterra competition system without instantaneous negative feedbacks (i.e., pure-delay systems)

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New results on the global asymptotic stability of?a?Lotka-Volterra system

In this paper, we revisit the famous Lotka-Volterra competitive system. By combining spectral matrix theory with Lyapunov function, some new sufficient conditions are obtained to guarantee the global asymptotic stability of a unique equilibrium for Lotka-Volterra competitive system. Our new results generalize and significantly improve the known results in the previous literature. The main purpose of this paper is to propose a new methodology to study the high-dimensional Lotka-Volterra system. And this method can be extensively used to study the global asymptotic stability of the equilibrium. Finally, some examples and their simulations show the feasibility and effectiveness of our results.     

n阶Lotka-Volterra系统永久持续生存的新判据(英文)

本文首先研究了n阶Lotka Volterra系统的非负平衡点之间的关系 .然后在此基础上研究了该系统的永久持续生存问题 ,得到了若干判别n阶Lotka Volterra系统永久持续生存的充要条件 .     

Lotka—Volterra生态系统的耗散性

本文考虑Lotka-Volterra生态系统x=diag(x)(a Ax)的耗散性。当系统为食饵-捕食者型时给出了判定耗散性的图论方法,并用所给方法详细讨论了4物种Lotka-Volterra系统.     

Competitive Lotka-Volterra population dynamics with jumps

This paper considers competitive Lotka-Volterra population dynamics with jumps. The contributions of this paper are as follows. (a) We show that a stochastic differential equation (SDE) with jumps associated with the model has a unique global positive solution; (b) we discuss the uniform boundedness of the pth moment with p>0 and reveal the sample Lyapunov exponents; (c) using a variation-of-constants formula for a class of SDEs with jumps, we provide an explicit solution for one-dimensional competitive Lotka-Volterra population dynamics with jumps, and investigate the sample Lyapunov exponent for each component and the extinction of our n-dimensional model.     

A remark on the period of the periodic solution in the Lotka-Volterra system

An important consideration in the nonlinear predator-prey problem of Lotka—Volterra type is the determination of the period. This paper gives a general expression for the period in terms of the given parameters in the Lotka-Volterra system. We also discuss the qualitative behavior of the period related to the energy level of the Lotka-Volterra system.     

三维Lotka-Volterra 系统正拟周期解的存在性和稳定性

This work focuses on the existence and stability of positive quasi-periodic solutions for the 3-dimensional Lotka-Volterra system. Using KAM （Kolmogorov-Arnold-Moser） theory and Newton iteration, it is shown that there exists a positive quasi-periodic solution in a Cantor family for the 3-dimensional Lotka-Volterra system. On the above basis, we can show the stability of the solution with the help of Lyapunov function.     

Bifurcation of Limit Cycles for 3D Lotka-Volterra Competitive Systems

Bifurcation of limit cycles is discussed for three-dimensional Lotka-Volterra competitive systems. A recursion formula for computation of the singular point quantities is given for the corresponding Hopf bifurcation equation. Some new results are obtained for 6 classes 26–31 in Zeeman’s classification, especially, an example with four limit cycles in class 29 is given for the first time. The algorithm applied here is effective for solving the above general cyclicity.     

Stationary probability distributions of some lotka-volterra types of stochastic predation systems

This paper provides exact solutions to the stationary probability distributions in some stochastic predation systems. These are derived by solving the Fokker-Planck equations for:

(i) a generalized stochastic Lotka-Volterra predator-prey system, and

(ii) a generalised stochastic Lotka-Volterra food chain.

In all these systems the growth dynamics of all levels of species are subject to stochastic shocks. Since stationary probability distributions provide the most comprehensive characterization of a stochastic system in a steady state, system stability can be analysed accordingly     

Asymptotic behaviour of the stochastic Gilpin-Ayala competition models

In this paper, we investigate a stochastic Gilpin-Ayala competition system, which is more general and more realistic than the classical Lotka-Volterra competition system.We discuss the asymptotic behaviour in detail of the stochastic Gilpin-Ayala competition system, and comparing the classical Lotka-Volterra with Gilpin-Ayala competition system, we find that the latter has better properties.     

具有无穷时滞的Lotka-Volterra食物链模型的全局吸引性

研究一类具有无穷时滞的n种群Lotka Volterra食物链系统 .通过构造适当的Lya punov泛函 ,得到了保证该系统正平衡点全局吸引的充分条件 .     

The criteria of ultimate boundedness for nonautonomous Lotka-Volterra tree systems

In this paper, by introducing a concept called the degree of species, we obtain a set of sufficient conditions for the ultimate boundedness of nonautonomous n-species Lotka-Volterra tree systems. As a consequence, we also obtain the criteria of the existence of a globally stable equilibrium point for the autonomous Lotka-Volterra tree system. The criteria in this paper are in explicit forms of the parameters, and thus, are easily verifiable.     

Population dynamical behavior of Lotka-Volterra system under regime switching

In this paper, we investigate a Lotka-Volterra system under regime switching

     

非线性三种群空间周期解的存在性

本文考虑以下系统: ,用Darboux方 法彻底解决了该系统空间周期解的存在性问题.     

Existence and global attractivity of positive periodic solutions for delay Lotka-Volterra competition patch systems with stocking

By means of Mawhin's continuation theorem of coincidence degree and Lyapunov functional, a set of easily verifiable criteria are established for the existence and global attractivity of positive periodic solutions for delay Lotka-Volterra competition patch system with stocking

     

Regularized Lotka-Volterra Dynamical System as Continuous Proximal-Like Method in Optimization

We introduce and study a new type of dynamical system which combines the continuous gradient method with a nonlinear Lotka-Volterra (LV) type of differential system within a logarithmic-quadratic proximal scheme. We prove a global existence and viability result for the resulting trajectory which holds for a general smooth function. The asymptotic behavior of the produced trajectory is analyzed and global convergence of the trajectory to a minimizer of the convex minimization problem over the nonnegative orthant is established. The implicit discretization which is at the origin of the proposed continuous dynamical system is an interior proximal scheme for minimizing a closed proper convex function, and convergence results and properties of the resulting discrete scheme are also established. We show finally that the trajectories of the family of regularized Lotka-Volterra systems, parametrized by the positive parameter associated with the quadratic proximal term, are uniformly convergent to the solution of the classical LV-dynamical system, as the parameter associated with the proximal term approaches zero.     

Symplectic realizations and symmetries of a Lotka-Volterra type system

In this paper a Lotka-Volterra type system is considered. For such a system, bi-Hamiltonian formulation, symplectic realizations and symmetries are presented.     

ON CRITERIA FOR GLOBAL STABILITY OF N-DIMENSIONAL LOTKA-VOLTERRA SYSTEMS

This paper gives the conditions for the existence of a globally stable equi-librium of rz-dimensional Lotka-Volterra systems in the following cases: Lotka-Volterra chain systems and Lotka-Volterra modei between one and multispecies. The conditions obtained in this paper are much weaker than those in [6] and more easily verifiable in application. So the results can be applied to more general Lotka-Volterra models. At the same time, the existence and stability conditions of positive equilibrium points of the above systems are given.