In this paper we consider a three level food web subject to a diseaseaffecting the bottom prey. The resulting dynamics is much richer with respectto the purely demographic model, in that it contains more transcriticalbifurcations, gluing together the various equilibria, as well as persistentlimit cycles, which are shown to be absent in the classical case. Finally,bistability is discovered among some equilibria, leading to situations in whichthe computation of their basins of attraction is relevant for the systemoutcome in terms of its biological implications.
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