Echoes from Toca do Enoque

Beneath the weathered roof of Toca do Enoque, a single radiocarbon‑anchored individual dated to 1681–1533 BCE offers a fragile window into the Late Holocene lifeways of Serra da Capivara. Archaeological data indicates long-term human presence across the upland sandstone escarpments of Piaui, where rock‑shelters preserve lithic scatters, hearths, and engraved stones. Limited evidence suggests this individual belonged to a local hunter‑gatherer tradition often grouped by researchers as the Hunter‑Gatherer Enoque phase, a regional label reflecting continuity in subsistence and mobility patterns rather than a sharply bounded culture. The cave context and associated tool types point to seasonal use of upland niches—strategies tuned to caatinga and gallery forest mosaics.

Genetic and archaeological lines converge to suggest deep connections with broader South American populations: the observed Y‑chromosome haplogroup Q aligns with widespread Native American paternal lineages, while mitochondrial A2e fits within a diverse set of maternal clades found across lowland and highland South America. Because inference is based on a single genome, any model of origins must remain provisional. Future sampling from neighboring sites in Serra da Capivara and stratigraphically secure contexts will be required to test scenarios of local continuity versus episodic gene flow.

Ancient DNA recovered from the Toca do Enoque individual yields a clear but singular signal: Y‑chromosome haplogroup Q and mitochondrial haplogroup A2e. Haplogroup Q is a common paternal lineage throughout the Americas and is broadly associated with the first millennia of population expansions following initial colonization. Mitochondrial A2e sits within the A2 maternal clade, which is well‑represented in South American contexts and points to deep maternal continuity in the region.

Because only one sample is available, population‑level inferences are inherently provisional. Archaeogenetic synthesis suggests that these haplogroups are consistent with longstanding regional ancestry rather than evidence of a recent external influx. Shotgun genomic data (if available) could clarify degrees of affinity to lowland Amazonian groups, Andean populations, or other eastern South American hunter‑gatherers, but such conclusions require multiple well‑dated genomes. In short: the genetic profile complements archaeological indications of local hunter‑gatherer continuity, yet the tiny sample size (<10, here =1) demands restraint in interpreting broader demographic processes.