Data from: The effect of miniaturization on the evolution of sexual size dimorphism in geckos

The evolution of miniaturization can result in dramatic alterations of
morphology, physiology and behavior; however the effects of
miniaturization on sexual dimorphism remain largely unknown. Here we
investigate how miniaturization influences patterns of sexual size
dimorphism (SSD) in geckos. Measuring 1,875 individuals from 131 species,
we characterized patterns of SSD relative to body size across two
families. We found that miniaturized species were more female-biased than
nonminiaturized species. Additionally, one family, Phyllodactylidae,
contained few miniaturized species and displayed an isometric trend in SSD
with body size, where changes in female body size were accompanied by
similar changes in male body size. By contrast, Sphaerodactylidae, which
contained many miniaturized species, displayed strongly allometric
patterns, where larger species were male-biased and smaller species were
more female biased. Smaller species in this lineage also produced
proportionally larger eggs. Together, these observations are consistent
with the hypothesis that selection for increased reproductive
success in small species drives the positive SSD allometry observed in the
lineage, and that selection for increased miniaturization in the clade may
be offset by selection on maintaining a female size in smaller taxa that
ensures reproductive success.