Fig. 4
From: Stable coevolutionary regimes for genetic parasites and their hosts: you must differ to coevolve
Characteristics of model (5). a Null - isoclines and equilibria. Left panel: positive non-trivial equilibria A1, A2 as q = 4; right panel: no positive non-trivial equilibria as q = 10. b Phase portraits. Left panel: phase portrait of model (5) as b > 0 with unstable non-trivial equilibria A1 and A2. Right panel: phase portrait of model (5) as b = 0 is similar to the phase portrait of model (1), no non-trivial equilibria