Genome‐wide single nucleotide polymorphisms (SNPs) were generated from sequencing double digested restriction‐associated (ddRAD, Peterson et al., 2012 (link)) and quadruple barcode ddRAD (quaddRAD) libraries (Franchini et al., 2017 (link)). Common minke whale and southern right whale libraries were generated from ddRAD libraries following Peterson et al. (2012 (link)). Fin whale libraries were generated from using the quaddRAD protocol as outlined by Franchini et al. (2017 (link)), which enables the removal of PCR clones. All libraries were prepared from genomic DNA digested with HindIII and MspI and insert sizes between 300 and 400 bp. Libraries were sequenced on an Illumina HiSeq™ 2500 (ver. 4) as paired‐end sequencing at 100 (ddRAD) or 125 (quaddRAD) cycles, with 10% PhiX spike‐in.
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