Figure 1

Map of the collection location for samples used in analyses. Historical (archival and archaeological) sample groups (in boldface, denoted with H) use approximate locations and the locations of archaeological sites where fish remains were recovered. Map created using ESRI ArcMap (v.10.6, https://arcgis.com). Only sample groups that were successfully genotyped and analysed are displayed. Numbers (n) represent those included in the final analysis for each sample group.