Vau‑Una Sambaqui (~600 BP)

Towering heaps of shell and bone—sambaquis—dot the Atlantic coast of Brazil and testify to generations who lived by the sea. The Vau‑Una mound at Vau - Sta. M. Vitória in Northeast Brazil belongs to this long‑lived coastal tradition often called the Sambaqui Culture. Archaeological data indicates that sambaqui building began millennia earlier in some regions; the Vau‑Una context for our sample dates to 1318–1409 CE, placing it among late pre‑contact coastal communities.

Environmental reconstructions suggest these sites grew where estuaries and rich intertidal zones provided abundant shellfish, fish, and birds. Shell mounds functioned as refuse deposits, habitation platforms, and sometimes cemeteries—markers of repeated, seasonal marine exploitation. Limited evidence from Vau‑Una supports a community organized around maritime resources, with material traces that include worked bone, shell ornaments, and human interments.

Because this entry rests on a single genome, conclusions about population origins remain tentative. Archaeological patterns suggest continuity in coastal foraging strategies and regional interaction across centuries; genetic data from Vau‑Una can be read as a first glimpse into the biological ancestry of one individual within these broader cultural landscapes. Further excavation and sampling are needed to track demographic continuity, migration, and social change across the sambaqui coastline.

The Vau‑Una assemblage currently includes one reported ancient genome dated to 1318–1409 CE. That individual carries Y‑chromosome haplogroup Q and mitochondrial haplogroup B—lineages widely reported among Indigenous peoples of the Americas. Y‑haplogroup Q represents a major founding paternal lineage across North and South America; mtDNA haplogroup B is one of the principal maternal branches found from Mesoamerica to southern South America.

These assignments align the Vau‑Una individual with continental patterns of Indigenous ancestry, suggesting biological continuity with broader Native American lineages rather than recent transoceanic input. However, sample count here is n=1, so any population‑level inference is highly preliminary. Archaeological context indicates local coastal adaptation, but genetic diversity within sambaqui communities could be substantial; a single genome cannot capture structure, sex‑biased mobility, or admixture dynamics.

Future work should pair increased sampling with isotopic analysis (for diet and mobility) and comparison to contemporaneous and earlier coastal genomes. Such integrated datasets could test hypotheses about long‑term continuity, gene flow along the Brazilian coast, and relationships between sambaqui builders and inland groups. For now, the genetic signal from Vau‑Una is a crucial but solitary thread in a much larger tapestry.