Data from: Inbreeding promotes female promiscuity

The widespread phenomenon of polyandry (mating by females with multiple
males) is an evolutionary puzzle, because females can sustain costs from
promiscuity, while full fertility can be provided by a single male. Using
the red flour beetle, Tribolium castaneum, we identify major fitness
benefits of polyandry to females under inbreeding, when the risks of
fertilization by incompatible male haplotypes are especially high. Fifteen
generations after inbred populations had passed through genetic
bottlenecks, we recorded increased levels of female promiscuity compared
to non-inbred controls, most likely due to selection from prospective
fitness gains through polyandry. These data illustrate how this common
mating pattern can evolve if population genetic bottlenecks increase the
risks of fitness depression due to fertilization by sperm carrying
genetically incompatible haplotypes.