Data from: Population genomic evidence reveals subtle patterns of differentiation in the trophically polymorphic Cuatro Ciénegas cichlid, Herichthys minckleyi

In recent decades, an increased understanding of molecular ecology has led
to a reinterpretation of the role of gene flow during the evolution of
reproductive isolation and biological novelty. For example, even in the
face of ongoing gene flow strong selection may maintain divergent
polymorphisms, or gene flow may introduce novel biological diversity via
hybridization and introgression from a divergent species. Herein, we
elucidate the evolutionary history and genomic basis of a trophically
polymorphic trait in a species of cichlid fish, Herichthys minckleyi. We
explored genetic variation at three hierarchical levels; between H.
minckleyi (n=69) and a closely related species H. cyanoguttatus (n=10),
between