GLOBAL ATTRACTIVITY IN NICHOLSON'S BLOWFLIES

摘要

In this paper we further study the delay differential equation N(t) = -δN(t) + pN (t-τ)e~(-aN(t-τ)), t ≥ 0 used in describing the dynamics of Nicholson's blowflies. When p > δ, we establish new sufficient conditions for the positive equilibrium N~* of (*) which is a global attractor. Our criteria improve correspondent results obtained by Kulenovic, Ladas and Sficas, and So and Yu.