Ceramic Age Caribbean Matches

As we should have done at the beginning, we finally went back and re-read the reference study (Fernandes et al.) used by 23andMe for their indigenous Caribbean references. As expected, our Matches are to Ceramic Age samples from sites in Hispaniola (mostly eastern), Puerto Rico, and Bahamas. Our historical matches fell into the following major groups based on the above study's analysis of the genomes of ancient Antillean peoples:

Haiti Ceramic: 2 matches

Bahamas Ceramic: 2 Matches

SECoast DR Ceramic: 11 Matches

Eastern Greater Antilles Ceramic: 11 matches

The overwhelming number of matches (although mostly small) are with what the study terms Southeast Coast DR groups and Eastern Greater Antilles (which includes samples from Puerto Rico and the eastern Dominican Republic). This matching pattern is to be expected given the Ceramic Age population largely replacing Archaic lineages and the pattern of close relatives from different sites on Hispaniola or genetic matches between individuals from other islands. To what extent this pattern was also due to relatively small population sizes in Hispaniola and Puerto Rico is another mystery. We have always tended to prefer somewhat higher population numbers for Puerto Rico and Hispaniola in pre-Columbian times based on Moscoso's analysis of Puerto Rico. 

We also found it cool that some of our larger matches were to the two Individuals in the Haiti Ceramic clade. These two individuals were related and harbored significant Archaic ancestry from groups on the island before the Saladoid or Arawakan expansion to the Greater Antilles (unless we are already outdated in our terminology here). We matched the two ancient Haitians from Diale for approximately the same amount of total shared cM on 2 segments. It would be interesting if part of that shared ancestry was from the earlier, Archaic population.