Appendix S1 Description of larval culture system.

Appendix S2 Tests of linkage dissequillibrium among the 15 microsatellite loci in five populations.

Appendix S3 Allele frequencies at 15 microsatellite loci for five populations defined by site, ecomorph, and habitat.

Appendix S4 Genotypes of admixed individuals from STRI Point and Hospital Bight based on the best fitting InStruct model.

Appendix S5 The percentage of samples with admixed genomes from outcrossing within ecomorphs (Out) and hybridization (Hyb) in three different InStruct models.

Appendix S6 Locus by locus herirchical amova excluding loci with null alleles.

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