Data and code for: Relative testis size is associated with vagina length but not sperm storage traits in Galliformes

This dataset contains the data and code to replicate the analyses in “Relative testis size is associated with vagina length but not sperm storage traits in Galliformes.” The study examined relationships among sperm storage capacity, sperm storage tubule (SST) morphology, relative testis mass (a proxy for post-copulatory sexual selection), and sperm traits across 26 Galliforme species. The dataset includes four files: RepeatDF.csv (data for repeatability calculations); SummaryBothFolds.csv (raw species and fold-level data); SummarySpeciesAvgs.csv (species-level averages across both folds); and Analysis.R (code to replicate analyses). Data files contain measurements from female reproductive tracts, male testis mass, and sperm samples.

Methods
For each species, one female was dissected; from each, two utero-vaginal junction (UVJ) folds (the SST-bearing region of the vagina) were analysed. Measurements from each individual include SST area and average tubule length measurements (from each UVJ fold), body mass, testis mass, vagina length, and sperm length (from 1–3 males per species; see dataset for details). A phylogenetic tree from Stein et al. (2015) is also required and available via Dryad (https://doi.org/10.5061/dryad.p2pn8).