DYNAMICAL ANALYSIS AND CONTROL IN A DELAYED DIFFERENTIAL-ALGEBRAIC BIO-ECONOMIC MODEL WITH STAGE STRUCTURE AND DIFFUSION  

作　　者：CHAO LIU QINGLING ZHANG JAMES HUANG WANSHENG TANG 

机构地区：[1]Institute of Systems Science,Northeastern University Shenyang,P.R.China [2]Department of Applied MathematicsHong Kong Polytechnic University,Hong Kong [3]Institute of Systems EngineeringTianjin University,Tianjin,P.R.China

出　　处：《International Journal of Biomathematics》2012年第2期1-31,共31页生物数学学报（英文版）

摘　　要：Nowadays, biological resource in prey-predator ecosystem is commercially harvested and sold with aim of achieving economic interest. Furthermore, harvest effort is usually influ- enced by variation of economic interest of harvesting and spatial heterogeneous environ- ment. In this paper, a delayed differential-algebraic bio-economic model is proposed, which is utilized to investigate interaction and coexistence mechanism of biological pop- ulation in the harvested ecosystem due to the variation of economic interest of harvesting as well as the change of population spatial diffusion and gestation delay. Local stability analysis of the proposed model without gestation delay and diffusion reveals that there is a phenomenon of singularity induced bifurcation due to the variation of economic interest of harvesting, and state feedback controllers are designed to stabilize the pro- posed model at the interior equilibrium. Furthermore, local stability of the proposed model with gestation delay and diffusion is studied, which reveals that the interior equi- librium loses its stability at some critical values of gestation delay and corresponding cycle occurs. It is also shown that population spatial diffusion and harvesting have a stabilizing effect on population dynamics. Finally, numerical simulations are carried out to show consistency with theoretical analysis obtained in this paper.

关 键 词：PREY-PREDATOR harvest effort economic interest BIFURCATION state feedbackcontrol. 

分 类 号：TP13[自动化与计算机技术—控制理论与控制工程] Q141[自动化与计算机技术—控制科学与工程]