Data from: Scaling of morphological characters across trait type, sex and environment: a meta-analysis of static allometries
Voje, Kjetil Lysne (2015), Data from: Scaling of morphological characters across trait type, sex and environment: a meta-analysis of static allometries, Dryad, Dataset, https://doi.org/10.5061/dryad.d78c5
Biological diversity is to a large extent a matter of variation in size. Proportional (isometric) scaling where large and small individuals are magnified versions of each other is often assumed the most common way morphological traits scale relative to overall size within species. However, the many traits showing non-proportional (allometric) scaling have motivated some of the most discussed hypotheses on scaling relationships in biology, like the positive allometry hypothesis for secondary sexual traits and the negative allometry hypothesis for genitals. I evaluate more than 3200 allometric parameters from the literature and find that negative allometry, not isometry, is the expected scaling relationship of morphological traits within species. Slopes of secondary sexual traits are more often steeper compared to other traits, but slopes larger than unity is also common for traits not under sexual selection. The steepness of the allometric slope is accordingly a weak predictor of past and present patterns of selection. Scaling of genitals varies across taxonomic groups, but negative allometry of genitals in insects and spiders is a consistent pattern. Lastly, I find indications that terrestrial organisms have an overall different scaling of morphological traits compared to aquatic species.