Fixation probabilities in graph-structured populations under weak selection
Fig 8
Fixation probability, ρ(r) is plotted against mutant fitness r, for the Star and the complete graph. Dotted lines show the linear approximation ρ(1+ δ) ≈ ρ∘ + δρ′, accurate for weak selection (δ ≪ 1). (A) For temperature initialization, the Star is an absolute suppressor of weak selection, ρ′ < (N − 1)/(2N), but a relative amplifier, ρ′/ρ∘ > (N − 1)/2. (B) For uniform initialization, the Star is an amplifier of weak selection, ρ′ > (N − 1)/(2N). Note that ρ(1) = ρ∘ = 1/N for both graphs, as is true for any graph under uniform initialization.