Topic: Biology

Scientists analyzed ancient DNA from a tomb in France and found that a population decline occurred around 3000 BC. The people buried before and after this decline were not related, indicating a major population replacement.

A team of researchers studied the remains of 132 individuals buried in a large megalithic tomb near Bury, about 50 kilometers north of Paris. They found that the site was used during two separate time periods, with a significant population decline occurring around 3000 BC between them.

The genetic analysis showed that the people buried before and after this decline were not related, indicating a major population replacement. The earlier group resembled Stone Age farming populations from northern France and Germany, while the later group showed strong genetic links to southern France and the Iberian Peninsula.

To better understand what caused this decline, researchers used a DNA technique that captures all genetic material preserved in bone. This approach revealed traces of ancient pathogens, including the plague bacterium Yersinia pestis and the organism responsible for louse-borne relapsing fever, Borrelia recurrentis.

The examination of skeletal remains also found unusually high death rates during the earlier burial period, especially among children and young people. The demographic pattern is a strong indicator of crisis.

The genetic findings also highlight a major shift in how these communities were organized. During the earlier phase, people buried in the tomb were often members of the same extended families, suggesting close-knit groups spanning multiple generations. In contrast, the later burials were more selective and largely centered around a single male lineage.

This indicates that the population change was accompanied by a shift in how society was structured.

Part of a broader European decline, the study adds to growing evidence that the so-called Neolithic decline affected large parts of northern and western Europe, extending beyond Scandinavia and northern Germany. It may also help explain why the construction of megalithic tombs and other large stone monuments came to an end across Europe during this period.

Story Source: Materials provided by University of Copenhagen. Note: Content may be edited for style and length.

Why It Matters

This study helps us understand how ancient societies changed over time, which can provide insights into the complexities of human history and culture. It also highlights the importance of genetic analysis in understanding population dynamics and societal changes.

Key Facts

• A significant population decline occurred around 3000 BC in a tomb near Paris, France.
• The people buried before and after this decline were not related, indicating a major population replacement.
• Ancient pathogens like the plague bacterium Yersinia pestis and Borrelia recurrentis were found in the DNA analysis.
• High death rates among children and young people during the earlier burial period suggest crisis.
• The study suggests that the Neolithic decline affected large parts of northern and western Europe.

Key Terms

Neolithic decline

A time period around 3000 BC when population sizes decreased significantly in Europe.

Implications

This study helps us understand how ancient societies changed over time, which can provide insights into the complexities of human history and culture. It also highlights the importance of genetic analysis in understanding population dynamics and societal changes.