A groundbreaking genetic study of ancient remains has uncovered evidence of a dramatic population collapse and replacement among Europe's megalith builders around 3000 BC, shedding new light on the end of this iconic Stone Age culture.
Researchers analyzed DNA from 132 individuals buried in a large megalithic tomb near Bury, north of Paris. The study, published in Nature Ecology & Evolution, revealed a clear genetic divide between people buried before and after a significant population crash. The earlier group, linked to Stone Age farming communities in northern France and Germany, was largely replaced by newcomers with genetic ties to southern France and the Iberian Peninsula.
"We see a clear genetic break between the two periods," explained Frederik Valeur Seersholm, a lead author from the University of Copenhagen. "The earlier group resembles Stone Age farming populations from northern France and Germany, while the later group shows strong genetic links to southern France and the Iberian Peninsula."
The investigation also uncovered traces of ancient diseases, including *Yersinia pestis* (plague) and *Borrelia recurrentis* (relapsing fever), in the ancient bones. However, scientists caution that disease alone likely didn't cause the collapse. "We can confirm that plague was present, but the evidence does not support it as the sole cause of the population collapse," stated Martin Sikora, a senior author. "The decline was likely driven by a combination of disease, environmental stress and other disruptive events." Evidence from the skeletons also points to unusually high mortality, especially among the young, indicating a severe societal crisis.
Beyond the population shift, the genetic data highlights significant social changes. Early burials featured multiple generations of extended families, suggesting close-knit communities. Later burials became more exclusive, dominated by a single male lineage, pointing to a different social structure. "This indicates that the population change was accompanied by a shift in how society was structured," Seersholm added.
These findings contribute to a growing picture of a Neolithic population decline across northern and western Europe. Crucially, the study suggests a direct link between the disappearance of these megalith-building populations and the cessation of monumental stone construction across the continent during the same era. "We now see that the end of these monumental constructions coincides with the disappearance of the population that built them," Seersholm concluded.
