Author contributions:
The study was conceived and supervised by M.D.E. Sample collection by M.D.E., B.K.L., J.M., A.G., R.L., K.M.K., C.L. & H.R. Genome and transcriptome assembly, annotation, introgression, heterozygosity and population analysis was done by S.J., PSMC and mitochondrial analysis by O.H. & Tajima’s D analysis by L.L. Guidance on genome assembly and analysis was provided by S.W.S. & S.L. Manuscript written by S.J. & O.H. All the authors commented upon the final manuscript.