# Periodic solutions of a discrete time three-species Lotka-Volterra food-chain system

Rui Xu, Fordyce Davidson, Mark A. J. Chaplain

Research output: Contribution to journalArticlepeer-review

## Abstract

The authors study the existence of the periodic solutions of the discrete time periodic three trophic level Lotka-Volterra food-chain system \align x_1(k+1)& = x_1(k)\exp[r_1(k)-a_{11}(k)x_1(k)-a_{12}(k)x_2(k)],\\ x_2(k+1)& = x_2(k)\exp[-r_2(k)+a_{21}(k)x_1(k)-a_{22}(k)x_2(k)-a_{23}(k)x_3(k)],\\ x_3(k+1)& = x_3(k)\exp[-r_3(k)+a_{32}(k)x_2(k)-a_{33}(k)x_3(k)]. \endalign By using {\it R. E. Gaines} and {\it J. L. Mawhin}'s continuation theorem of coincidence degree theory [Coincidence degree, and nonlinear differential equations. Lect. Notes Math. 568 (1977; Zbl 0339.47031)], some sufficient conditions are derived for the existence of positive periodic solutions of the above system.
Original language English 429-440 12 Nonlinear Functional Analysis and Applications 9 3 Published - 2004

## Keywords

• Lotka-Volterra
• Discrete time
• Positive solution
• Periodic solution
• Coincidence degree

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