کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
758759 896449 2011 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of environmental fluctuation and time delay on ratio dependent hyperparasitism model
موضوعات مرتبط
مهندسی و علوم پایه سایر رشته های مهندسی مهندسی مکانیک
پیش نمایش صفحه اول مقاله
Effects of environmental fluctuation and time delay on ratio dependent hyperparasitism model
چکیده انگلیسی

A model of host–parasitoid–hyperparasitoid is considered with ratio dependence between parasitoid and hyperparasitoid. First, the conditions for local stability and increasing host fitness due to the effect of hyperparasitism are deduced. Next, we study the effects of stochastic environmental fluctuations and discrete time delay on the system behavior and calculate the corresponding populations variances. Numerical simulations illustrate that populations densities oscillate randomly around equilibrium points. Also, in contrast to previous literature, the simulations carried out here indicate that populations variances oscillate with the increase of time delay.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Communications in Nonlinear Science and Numerical Simulation - Volume 16, Issue 6, June 2011, Pages 2609–2619
نویسندگان
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