Data from: The loss of self-incompatibility in a range expansion

It is commonly observed that plant species’ range margins are enriched for
increased selfing rates and, in otherwise self-incompatible
species, for self-compatibility (SC). This has often
been attributed to a response to selection under mate and/or
pollinator limitation. However, range expansion can also cause
reduced inbreeding depression, and this could facilitate the evolution
of selfing in the absence of mate or pollinator limitation. Here,
we explore this idea using spatially explicit individual-based
simulations of a range expansion, in which inbreeding
depression, variation in self-incompatibility (SI), and mate
availability evolve. Under a wide range of conditions, the
simulated range expansion brought about the evolution of selfing after the
loss of SI  in range-marginal populations. Under conditions of
high recombination between the self-incompatibility locus (S-locus) and
viability loci, SC remained marginal in the expanded 
metapopulation and could not invade the range core, which remained
self-incompatible. In contrast, under low recombination and
migration rates, SC was frequently able to displace SI in the
range core by maintaining its association with a genomic
background with purged genetic load. We conclude that the
evolution of inbreeding depression during a range expansion promotes
the evolution of SC at range margins, especially under high rates
of recombination.