Pleistocene glaciation drove shared population coexpansion in eastern North American snakes

Glacial cycles during the Pleistocene had profound impacts on local environments and climatic conditions. In North America, some regions that currently support diverse biomes were entirely covered by ice sheets, while other regions were environmentally unsuitable for the organisms that live there now. Organisms that occupy these regions in the present day must have expanded or dispersed into these regions since the last glacial maximum, leading to the possibility that species with similar geographic distributions may show temporally concordant population size changes associated with these warming trends. We examined 17 lineages from 9 eastern North American snake species and species complexes to test for a signal of temporally concordant coexpansion using a machine learning approach. We found that the majority of lineages show population size increases towards the present, with evidence for coexpansion in five out of fourteen lineages, while expansion in others was idiosyncratic. We als..., , , # Data accompanying: Pleistocene glaciation drove shared population coexpansion in eastern North American snakes

### Harrington, Overcast, Myers, and Burbrink

All scripts used to analyze these data are available in the Github repository accompanying this paper: [https://github.com/seanharrington256/Coexp_scripts](https://github.com/seanharrington256/Coexp_scripts).

Raw sequence reads generated for this study are available on the NCBI Sequence Read Archive under BioProject ID PRJNA1189052. Note that data for L. getula and L. traingulum complexes were obtained from previous publications as described in the Methods section of the manuscript.

## Information about individual samples:

* `Appendix_1.xlsx` - Geographic coordinates, species/complex designation, population designation, and number of sequencing reads for samples in this study, excluding the previously published milk snake data. In the case of specimens of *Farancia*, museum numbers are included as a separate column, as the nu...