Nevertheless,
critical migration rates are generally lower than for Scenario B.
Similar to the effect of dominance,
critical migration rates increase with increasing NI level (results not shown).
In other words, dominant incompatibilities persist up to higher
critical migration rates than codominant and recessive NI.
Positive selection on island alleles leads to a higher persistence against migrants, and thus
critical migration rates increase with increasing strength of selection.
In general, Wolbachia infection easily spreads on the island upon secondary contact, and
critical migration rates are either zero or close to it [34].
Then, CI and NI act in synergy and reach high
critical migration rates up to 17 % for both isolating mechanisms.
Figure 3A shows that
the critical migration rate increases with increasing dominance level.