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具有Beddington—DeAngelis功能性反应的三维离散顺环捕食系统的持久性
引用本文:袁立伟,杨志春.具有Beddington—DeAngelis功能性反应的三维离散顺环捕食系统的持久性[J].重庆师范学院学报,2009(4):70-73.
作者姓名:袁立伟  杨志春
作者单位:重庆师范大学数学与计算机科学学院,重庆400047
基金项目:重庆市自然科学基金科研项目(No.CSTC2008BB2364);重庆市教委科研项目(No.KJ080806);重庆师范大学科研项目(No.08XLZ08)
摘    要:研究一类具有Beddington—DeAngelis功能性反应的三维顺环捕食系统的持久性问题。首先,建立具有B-D功能性反应的三维顺环捕食系统的半离散化数学模型,具体为{x1(n+1)=x1(n)exp{r1(n)-a1(n)x1(n)-b1(n)x2(n)/c1(n)+d1(n)x2(n)+x1(n)+k3(n)+b3(n)x3(n)/c3(n)d3(n)x1(n)+x3(n)]} x2(n+1)=x2(n)exp{r2(n)-a2(n)x2(n)-b2(n)x3(n)/c2(n)+d2(n)x3(n)+x2(n)+k1(n)+b1(n)x1(n)/c1(n)d1(n)x2(n)+x1(n)]}。x3(n+1)=x3(n)exp{r3(n)-a3(n)x3(n)-b3(n)x1(n)/c3(n)+d3(n)x1(n)+x3(n)+k2(n)+b2(n)x2(n)/c2(n)d2(n)x3(n)+x2(n)]}。然后,利用不等式技巧,得到系统永久持续生存性的一个充分条件,即:假设条件r1^Lc1^L〉b1^UM2,r2^Lc2^L〉b2^UM3,r3^Lc3^L〉b3^UM1成立,则此半离散化三维顺环捕食系统是永久持续生存的,其中M1=max{r1^U+k3^Ub3^U/a1^L,exp(r1^U-1+k3^Ub3^U)/a1^L},M2=max{r2^U+k1^Ub1^U/a2^L,exp(r2^U-1+k1^Ub1^U)/a2^L},M3=max{r3^U+k2^Ub2^U/a3^L,exp(r3^U-1+k2^Ub2^U)/a3^L}均为正常数。所获得结论将连续情形推广到了半离散化模型。

关 键 词:持续生存  捕食系统  Beddington—DeAngelis功能性反应

Permanence of a Three-Species Clockwise Chain Predator-Prey System with Beddington-DeAngelis Functional Response
YUAN Li-wei,YANG Zhi-chun.Permanence of a Three-Species Clockwise Chain Predator-Prey System with Beddington-DeAngelis Functional Response[J].Journal of Chongqing Normal University(Natural Science Edition),2009(4):70-73.
Authors:YUAN Li-wei  YANG Zhi-chun
Institution:(College of Mathematics and Computer Science, Chongqing Normal University, Chongqing 400047, China)
Abstract:This paper studies the permanence of a predator-prey system with three-species clockwise chain and Beddington-DeAngelis functional response. Firstly, A mathematical model of a predator-prey system with three-species clockwise chain and B-D functional response is formulated in the following form of semi-discretisations {x1(n+1)=x1(n)exp{r1(n)-a1(n)x1(n)-b1(n)x2(n)/c1(n)+d1(n)x2(n)+x1(n)+k3(n)+b3(n)x3(n)/c3(n)d3(n)x1(n)+x3(n)]} x2(n+1)=x2(n)exp{r2(n)-a2(n)x2(n)-b2(n)x3(n)/c2(n)+d2(n)x3(n)+x2(n)+k1(n)+b1(n)x1(n)/c1(n)d1(n)x2(n)+x1(n)]}.x3(n+1)=x3(n)exp{r3(n)-a3(n)x3(n)-b3(n)x1(n)/c3(n)+d3(n)x1(n)+x3(n)+k2(n)+b2(n)x2(n)/c2(n)d2(n)x3(n)+x2(n)]}Then, a sufficientcondition ensuring the uniform permanence of the system is obtained by using some skills of inequalities ,that is, the system with three-species clockwise chain in form of semi-discretisations is permanent provided that r1^Lc1^L〉b1^UM2,r2^Lc2^L〉b2^UM3,r3^Lc3^L〉b3^UM1,where M1=max{r1^U+k3^Ub3^U/a1^L,exp(r1^U-1+k3^Ub3^U)/a1^L},M2=max{r2^U+k1^Ub1^U/a2^L,exp(r2^U-1+k1^Ub1^U)/a2^L},M3=max{r3^U+k2^Ub2^U/a3^L,exp(r3^U-1+k2^Ub2^U)/a3^L}is positively invariant. The results of the corresponding continuous systems in some relevant references are extended to ones of the systems in form of semi-discretisations.
Keywords:permanence  predator-prey system  Beddington-DeAngelis functional response
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