Disease in prey population and body size of intermediate predator reduce the prevalence of chaos-conclusion drawn from Hastings-Powell model

被引:29
作者
Das, Krishna Pada [1 ]
Chatterjee, Samrat [1 ]
Chattopadhyay, J. [1 ]
机构
[1] Indian Stat Inst, Agr & Ecol Res Unit, Kolkata 700108, W Bengal, India
关键词
Disease in prey; Body size; Intermediate predator; Chaos; Stable; Permanence; Impermanence; 3-SPECIES FOOD-CHAIN; DYNAMICS; STABILITY;
D O I
10.1016/j.ecocom.2009.03.003
中图分类号
Q14 [生态学(生物生态学)];
学科分类号
071012 ; 0713 ;
摘要
In ecology the disease in the prey population plays an important role in controlling the dynamical behaviour of the system. We modify Hastings and Powell's (HP) [Hastings, A., Powell, T., 1991. Chaos in three-species food chain. Ecology 72 (3), 896-903] model by introducing disease in the prey population. The conditions for which the modified HP model system represents extinction, permanence or impermanence of population are worked out. The modified model is analyzed to obtain different conditions for which the system exhibits stability around the biologically feasible equilibria. Through numerical simulations we display that the modified system enters into stable solutions depending upon the force of infection in prey population as well as body size of intermediate predator. Our results demonstrate that disease in prey population and body size of intermediate predator are the key parameters for controlling the chaotic dynamics observed in original HP model. (C) 2009 Elsevier B.V. All rights reserved.
引用
收藏
页码:363 / 374
页数:12
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