Guayabo Blanco: Marshland Ancients

Ciénaga de Zapata’s Guayabo Blanco occupies a drowned, marshy edge of western Cuba that preserved traces of human presence across the Archaic Period. Archaeological data indicates episodic coastal occupation between roughly 800 BCE and 400 CE, with shell-rich deposits and simple chipped-stone implements typical of the Caribbean Archaic tradition. The landscape — mangrove fringes, lagoons, and tidal flats — offered abundant marine resources and shaped seasonal mobility.

Limited evidence suggests these occupants were part of the wider network of preceramic and early ceramic groups that moved through the Greater Antilles, drawing on maritime skills and mainland contacts. The site’s pocket of preserved organic material and stratified midden deposits provide a local sequence for interpreting changing coastal economies and shoreline use. Radiocarbon calibrations for the Guayabo Blanco contexts fall within the given date range but span several centuries, indicating either a long-lived seasonal locus or episodic reoccupation.

Because excavation and sampling remain modest, broader models about population origins — whether direct colonists from northern South America, mainland Central America, or autochthonous island developments — remain provisional. Additional archaeological survey and expanded ancient DNA sampling will be required to clarify the directionality and tempo of early Caribbean settlement.

Ancient DNA from three individuals recovered at Guayabo Blanco provides a rare molecular window into Cuba’s Archaic inhabitants. All three individuals carry paternal haplogroups within Q — two labeled broadly as Q and one as Q1b — while maternal lineages are dominated by Native American founding clades: two D1 and one A2. These markers align with the primary founding lineages known across the Americas and are consistent with genetic affinities between early Caribbean populations and mainland South American groups.

The presence of Y haplogroup Q and mtDNA D1/A2 supports an interpretation of descent from the greater Native American gene pool that peopled the islands during late Pleistocene and Holocene migrations. Q1b is a documented sublineage in parts of the Americas, and its occurrence here may indicate paternal continuity or a localized subclade expansion. However, because the sample count is small (n = 3), conclusions about population structure, sex-biased migration, or admixture are preliminary.

Archaeogenetic comparisons with other Antillean and northern South American ancient samples could clarify whether Guayabo Blanco individuals cluster with mainland source populations or represent a distinct insular branch. Future work should prioritize increased sampling, genome-wide analyses, and direct radiocarbon dating of analyzed remains to resolve chronology, kinship, and mobility patterns more robustly.