Selection over small and large spatial scales in the face of high gene flow

Local adaptation represents the balance of selection and gene flow. Increasingly, studies find that adaptation can occur on spatial scales much smaller than the scale of dispersal, resulting in balanced polymorphisms within populations. However, in many cases we lack information on how this microgeographic adaptation might facilitate or hinder larger scale environmental heterogeneity, for example across latitude. Marine systems present a special case, as many marine species have high dispersal capacity so that dispersal ‘neighborhoods’ may encompass environmental heterogeneity over both extremely small and extremely large spatial scales. Here, we leverage fine-scale sampling across the California range of the Pacific purple urchin (Strongylocentrotus purpuratus), a species with previous evidence of both local adaptation and extremely high gene flow. We find that despite complete absence of neutral population structure, satellite-based sea surface temperature and tidal zone drive genetic..., , , # Selection Over Small and Large Spatial Scales in the Face of High Gene Flow README contains necessary files for rerunning analyses discussed in this paper ## Description of the data and file structure Directories and their contents. Any NAs represent missing data. ## data ``` 6.filtered_goodinds.recode.vcf: vcf file for 114 individuals and 991,002 SNPs 6.filtered_goodinds_thin.recode.vcf: thinned to 19,081 SNPs CORRECTED_SNPS_qvalues_114ind.csv: data for Outflank * CHROM= chromosome * POS= position * FST_site= FST values associated with site * FST_tidal= FST values associated with tidal zone (intertidal v. subtidal) * FST_NS= FST values associated with northern v. southern sites * NS_qvalues= qvalues associated with northern v. southern sites * Tidal_qvalues= qvalues associated with tidal zone (intertidal v. subtidal) * Site_qvalues= qvalues associated with site. ``` ## metadata ``` sites_data.csv: site information *site= site name *site_code= 2-3 letter code for each site *l...