First Farmers of Spain

The arrival of farming in the Iberian Peninsula is one of the most visually striking population shifts of prehistory: fields and domesticates replace broader bands of hunter-gatherers and new pottery styles appear across the landscape. Archaeological data from sites such as Els Trocs (Huesca), El Prado de Pancorbo (Burgos), Cueva de Chaves and Fuente Celada, and coastal/near-coastal localities like Cova Bonica (Vallirana, Barcelona) document Early Neolithic settlements and burials dated between 5474 and 4367 BCE. Material culture—domesticated cereals and pulses, polished stone axes, and early pottery—signals a package of lifeways associated with farmer groups that first spread into Iberia during the 6th millennium BCE.

Genetic data from 19 sampled individuals assigned to Spain_EN fit this archaeological picture: genomes show a predominant Anatolian-derived Early Farmer ancestry common across early European farming communities. This genetic signature is consistent with a demic movement of people carrying agricultural practices into Iberia, though the archaeological pattern also suggests regional variation in timing and intensity. Limited evidence indicates that incoming farmers interacted and mixed with resident hunter-gatherer groups, a process visible in both material culture transitions and incremental genetic admixture.

Caveats and uncertainties remain. Nineteen genomes give a meaningful window but cannot capture the full diversity of a large and regionally varied peninsula. Archaeological context varies by site—some deposits are well-stratified while others are fragmentary—so interpretations of pace, routes, and social mechanisms of Neolithization should be seen as provisional and refined as more data accrue.

The genetic portrait of Spain_EN individuals complements the archaeological narrative. Genome-wide data indicate a predominance of Early Farmer ancestry derived from Anatolian Neolithic populations—this component is a hallmark of Europe's first farmers and is consistent across many sites sampled in Spain between 5474 and 4367 BCE. Overlaid on that farmer ancestry is evidence for varying degrees of admixture with local Western Hunter-Gatherer (WHG) groups; the admixture signal is heterogeneous by individual and site, implying regionally different interaction histories.

Uniparental markers give additional resolution. Maternal lineages are dominated by mtDNA haplogroups typical of early European farmers—K (7/19), J (3/19), and T (3/19)—a pattern that mirrors Neolithic assemblages elsewhere in Europe and supports a strong matrilineal continuity with incoming farmer groups. Paternal markers are more mixed: Y haplogroups G (3/19) and F (1/19) align with Neolithic male lineages seen in Anatolia and early European farmers, while I (3/19), R (1/19) and R1b (1/19) suggest incorporation of local hunter-gatherer or regionally diverse male ancestries. This contrast—farmer-dominated mtDNA and a partially mixed Y-DNA pool—may reflect sex-biased processes (e.g., patrilocality, exogamy), demographic complexities, or stochastic sampling.

Interpretation must be cautious. The sample set is 19 individuals: enough to detect broad patterns but limited for fine-grained demographic modeling. Heterogeneity among sites underlines that the Neolithic transition in Iberia was not monolithic: it involved migration, local admixture, and variable social strategies across landscapes.