The effects of impulsive releasing methods of natural enemies on pest control and dynamical complexity |
| |
Authors: | Wei Gao Sanyi Tang |
| |
Institution: | College of Mathematics and Information Science, Shaanxi Normal University, Xi’an, 710062, PR China |
| |
Abstract: | In the present paper the different releasing methods including constant releasing and proportional to the predator population are considered and analyzed. The effects of these releasing methods of natural enemies on dynamical behavior are investigated. We firstly take into account the model with an impulsive effect at fixed moments, and the results imply that under some conditions the pest may serve to extinction. Several types of attractors can coexist, with switch-like transitions among their attractors showing that varying dosages and frequencies of insecticide applications and the numbers of natural enemies released are crucial. Secondly, the model with unfixed moments is further investigated. Different periodic solutions also exist and the maximum amplitude of the host is always less than the economic threshold. Comparing the results obtained for the two models concludes that the proportional releasing predator has strong effects on the dynamical behavior. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|