Fig. 2
From: Stable coevolutionary regimes for genetic parasites and their hosts: you must differ to coevolve
Characteristics of model (1). a Parameter-phase portrait. D1, D2 and D3 are the domains with qualitatively different model behaviors. The boundaries are: \( \boldsymbol{Q}:q=\frac{\left(1+e\right){e}_P}{\left(1+\alpha e\right){e}_R} \)(blue), \( \boldsymbol{B}:e=\frac{K-4{e}_R}{4\alpha {e}_R} \) (red). b Examples of phase portraits of model (1) with a stable trivial equilibrium O (all domains); stable semi-trivial equilibrium O2 and unstable semi-trivial equilibrium O1 (domain D2); unstable semi-trivial equilibria O1, O2 (domain D3)