DOI: 10.5061/dryad.kd51c5bhz
title: Body size divergence in the Plestiodon skiltonianus group

description: We provide the R code and morphological measurements used to compare body
 size divergence in different parts of the range of a monophyletic group of
 scincid lizards (Plestiodon skiltonianus species group) in western North
 America. Behavioral experiments have shown that successful mating among
 members of the group occurs more than 50% of the time if the body size
 difference of a male-female pair lies within 10 mm of an optimal threshold
 but quickly falls to ~5% once it reaches 15 mm. Beyond 15 mm, individuals
 tend to avoid any interaction at all. We used this information to test
 whether a greater proportion of heterotypic pairs drawn from inside two
 introgression zones fall within the ±10 mm optimum compared to pairs drawn
 from outside those areas. To test this hypothesis, we used rangewide
 specimen data from Richmond (2005) to calculate the body size difference
 (measured as snout-vent-length [SVL] in millimeters) of 500 randomly
 sampled pairs in each of four groups: (1) heterotypic pairs from the
 Diablo subrange of the inner Coast Ranges (ICR; Fig. 1) of central
 California, or introgression zone 1; (2) heterotypic pairs from the
 vicinity of the Kern River Valley (KRV), or introgression zone 2; (3)
 heterotypic pairs from areas without introgression; and (4) rangewide
 within the same morphotype. For heterotypic pairs, we sampled male P.
 gilberti and female P. skiltonianus to match the direction of
 mitochondrial introgression described in the paper. For group (4), the
 male was sampled first and then the female was randomly sampled from the
 same morphotype and mitochondrial clade to negate the effects of
 geographic variation in body size. We performed the permutation test in R
 (R_Core_Team 2021) using a custom script and plotted the distributions of
 the body size differences for each of the four groups in the paper.
description: We obtained the morphological data from whole skink specimens and
 organized it in an excel spreadsheet, which we then saved as a .cvs vile
 for analysis in R. 
description: # Body size divergence in the Plestiodon skiltonianus group
 [https://doi.org/10.5061/dryad.kd51c5bhz](https://doi.org/10.5061/dryad.kd51c5bhz) ## Description of the data and file structure These data consist of body size measurements for whole skink specimens obtained from across the range of the *Plestiodon skiltonianus* group.  ### Files and variables #### File: EVO\_24\_0432\_introg\_morphology.xlsx **Description:** Body size data from whole skink specimens ##### Variables * number = specimen ID number (institution code + number, or field tag no.) * ecomorph (0 = small-bodied; 1= large-bodied) * clade = mitochondrial clade identity * county = county or province * sex = (0 = male; 1 = female) * svl = snout-to-vent length in millimeters (mm) * logsvl = log tranformed snout-to-vent length (mm) * introgr = (0 = outside introgession zone; 1 = within introgression zone) ## Code/software This file contain the R code, with markdown, to perform the permutation tests used to compare body size divergence in different parts of the range of the* P. skiltonianus* species complex. ## Access information Other publicly accessible locations of the data: * N/A Data was derived from the following sources: * N/A