Dynamics under different transfer scenarios. Features of the dynamics in different transfer and clustering scenarios, as fitness cost c and exposure to the beneficial environment εare varied. The equilibrium position is shown by the shading at the relevant point in parameter space. If the equilibrium state has x
> 0.95, meaning that more than 95% of the population carries the complete pathway, the parameter space point is shown shaded in black. If instead x0 > 0.95, the shape is unshaded. If the equilibrium is more than 0.05 from each extreme, the shading is grey. A circle at a point indicates that the peak of the trajectory is below 0.05, while a triangle indicates that the peak is above 0.05. The dashed curve shows the boundary given by Equation (3). The other parameters are b = 0.1,n = 5,δ = 10−9.