Author Contributions
MBP, SLW, PER, SRJ, PWS and JEI conceived the ideas and designed the methodology. MBP, JEI and HSE collected the samples. MBP and HSE conducted the laboratory work. SLW conducted the larval dispersal modelling. MBP conducted the genomic analyses. CS and IS provided bioinformatic support. MBP wrote the paper and all authors contributed to critically reviewing the paper. MBP and CS produced reproducible scripts for the analyses and archived the data.
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Table 1. Number of polymorphic SNPs retained after each stage of the data filtering process in 2 RADseq datasets of the intertidal marine gastropods Steromphala umbilicalis and Nucella lapillus .