Reshaping Europe: New Insights from Ancient DNA
Recent ancient DNA studies have significantly refined the understanding of human migrations into Europe. Previously, a simplified model suggested three major waves from the east: the arrival of hunter-gatherers over 40,000 years ago, the expansion of farming populations from Anatolia after 9,000 years ago, and the movement of the Corded Ware people from the Russian steppe 5,000 years ago, which initiated the European Bronze Age.
This simplified view has been challenged by new research, which highlights more complex interactions between ancient populations, particularly in North-West Europe.
North-West European Discoveries Unveil Complexities
A recent study involving institutions from the U.S. and Europe has investigated prehistoric populations in Belgium and the Netherlands. The research also identified the source population for a late Neolithic migration into Britain, which appears to have led to a significant replacement (90%) of Britain's Neolithic farmers.
Earlier ancient DNA research indicated a more nuanced picture than previously thought. For example, while early Neolithic farmers initially had limited interaction with local hunter-gatherers, within 1,000–2,000 years, their genomes showed increased local hunter-gatherer ancestry, sometimes rising from 10% to 30–40% in certain regions.
Wetlands Research and the Female Role in Farming's Spread
Research conducted at the University of Huddersfield, in collaboration with Bournemouth University and Université de Liège, analyzed genomes from Neolithic human remains along the River Meuse in Belgium, dating back approximately 5,000 years ago. This work was part of a broader project led by Harvard University, extending the focus to the Lower Rhine–Meuse wetlands and coastal areas.
The findings revealed that people from later Neolithic times in Belgium possessed at least 50% local hunter-gatherer ancestry alongside Anatolian farmer ancestry. Similar patterns were observed in other water-rich environments across the region. Notably, some earlier Neolithic Dutch samples from the Swifterbant culture retained close to 100% hunter-gatherer ancestry, despite some adoption of agriculture.
Analysis of Y-chromosome (male) and mitochondrial DNA (female) in the Belgian remains indicated that Y chromosomes were characteristic of hunter-gatherers, while three-quarters of the mitochondrial DNA lineages originated from Neolithic farmers. This suggests that farming knowledge may have been introduced into hunter-gatherer communities by women.
This finding supports the "frontier mobility" or "availability" model for the spread of the Neolithic, which posits a contact zone between pioneer farming groups and hunter-gatherer areas, involving trade and marriage alliances. The results suggest the frontier was more permeable to women than men, with Neolithic women marrying into forager communities, potentially facilitating the adoption of farming.
The Bell Beaker Culture and Genetic Transformation in Britain
Around 4,600 years ago, a new wave of settlers—pastoralist-farmers from the Russian steppe—entered the Rhine area as the Corded Ware culture. These populations later transformed into the Bell Beaker culture. Within a few centuries, the genetic landscape of the Rhine–Meuse region was significantly altered, with over 80% of ancestry originating from the steppe.
The Bell Beaker people expanded rapidly, spreading across Central Europe, the English Channel, and throughout Britain, reaching as far north as Orkney. This expansion coincided with the near disappearance of British farmers who had built Stonehenge over prior centuries. Further archaeological and ancient DNA research is expected to provide more detailed insights into these events.