Fig 5. Subsample of data showing PC analysis, admixture and F_ST results for only individuals identified as the proposed Northern Coastal Roach subspecies.

Initial analyses (A–C) show results which include a northern group (NAV/GRN) and a southern group (EEL/RUS). Subsequent analyses (C–E) include only those locations within the southern group and illustrate the population structure within the Russian River and absence of structure in the Eel River. Colors are consistent between subfigures and nomenclature consistent with abbreviations in S1 Table.