Levels and partitioning of genetic variation of northeastern populations of diamondback terrapin (<em>Malaclemys terrapin</em>)

The diamondback terrapin (Malaclemys terrapin) is a mid-sized turtle that serves as a keystone predator in salt marsh ecosystems of eastern North America. The terrapin has historically faced population declines due to habitat loss and overharvesting, which has resulted in its listing under multiple jurisdictions across the northern part of its range. To characterize levels and partitioning of terrapin genetic variation throughout the northeast region, we used restriction site-associated DNA sequencing (RADseq). We analyzed genetic variation among 116 individuals sampled across 18 sites. Within-population genetic diversity was relatively low (He = 0.080–0.122), and we observed a strong negative correlation between diversity and latitude. Furthermore, levels of genetic differentiation were moderate (pairwise FST = 0.00–0.19), with the mean pairwise FST of each population exhibiting a strong positive correlation with latitude. Together, these results are consistent with a model of serial c..., , # Data from: Levels and partitioning of genetic variation of northeastern populations of diamondback terrapin (*Malaclemys terrapin*) Dataset DOI: [10.5061/dryad.n2z34tnbb](https://doi.org/10.5061/dryad.n2z34tnbb) ## Description of the data and file structure A genotype file containing the final SNP genotypes for all diamondback terrapin individuals analyzed in the paper. This data file is formatted as a GENEPOP file for use with the package 'graph4lg' in R after conversion from class 'genind'. The first line provides a list of loci names in the order they are listed for each genotyped individual on the lines below. Each multilocus genotype is then listed on a single line, beginning with the sample identifier and proceeding to list the alleles recorded for each locus. ### Files and variables #### File: admixture_plots_081525.R **Description:** R code used to generate figures based on the ADMIXTURE results. #### File: admixture_refiltered_23.sh **Description:** Slurm script used ...,