Data from: Dispersal evolution in the presence of Allee effects can speed up or slow down invasions

Successful invasions by sexually reproducing species depend on the ability
of individuals to mate. Finding mates can be particularly challenging at
low densities (a mate-finding Allee effect), a factor that is only
implicitly accounted for by most invasion models, which typically assume
asexual populations. Existing theory on single-sex populations suggests
that dispersal evolution in the presence of a mate-finding Allee effect
slows invasions. Here we develop a two-sex model to determine how mating
system, strength of an Allee effect, and dispersal evolution influence
invasion speed. We show that mating system differences can dramatically
alter the spread rate. We also find a broader spectrum of outcomes than
earlier work suggests. Allowing dispersal to evolve in a spreading context
can sometimes alleviate the mate-finding Allee effect and slow the rate of
spread. However, we demonstrate the opposite when resource competition
among females remains high: evolution then acts to speed up the spread
rate, despite simultaneously exacerbating the Allee effect. Our results
highlight the importance of the timing of mating relative to dispersal and
the strength of resource competition for consideration in future empirical
studies.