Persistence, Attractivity, and Delay in Facultative Mutualism

Relations between persistence and ultimate boundedness of the solutions of the Lotka]Volterra system dx t. dt sx t.wr1ya11x tyt.qa22y tyt.x dy t. dt sy t.wr2qa21x tyt.ya22y tyt.x modelling ‘‘facultative mutualism’’ with delayed responses are established and sufficient conditions are obtained for the global attractivity of the positive equilibrium of the delay system