Coexistence and stability of an unstirred chemostat model with Beddington-DeAngelis function

This paper deals with an unstirred chemostat model with the Beddington-DeAngelis functional response. First, a sufficient condition to the existence of positive steady state solutions is established. Second, the effect of the parameter @b"1 in the Beddington-DeAngelis functional response which models mutual interference between species u is considered. The result shows that if @b"1 is sufficiently large, the solution of this model is determined by a limiting equation. The main tool used here includes the fixed point index theory, the perturbation technique and the bifurcation theory.

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