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Genetic and archaeological research revealed how ancient farming communities disappeared in parts of Europe around 5,000 years ago.
Analyses of ancient DNA, abandoned tombs, and environmental changes show that epidemics, migrations, and the retreat of agriculture profoundly transformed regions like the Paris Basin and Scandinavia during the Neolithic decline.
Between around 3300 BC and 2900 BC, northern Europe experienced a significant reduction of farming populations that occupied regions like the Paris Basin and parts of Scandinavia, in a process that deeply altered ancient social structures and modes of occupation.
At the same time, recent analyses of ancient DNA, archaeological evidence, and environmental records began to indicate that epidemics, the retreat of agriculture, community reorganization, and migrations contributed to transforming these societies approximately 5,000 years ago.
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In the Paris Basin, the megalithic tomb of Bury, located about 50 kilometers north of the French capital, became one of the main vestiges used to reconstruct this phase of population transformation observed by archaeologists and geneticists.
There, researchers identified two distinct phases of funerary use, interrupted by an interval of almost 200 years without burials, a period that coincides precisely with the population retreat recorded in different areas of northwestern Europe.
Ancient DNA revealed population change in the Paris Basin
By analyzing the genetic material of individuals buried in Bury, researchers identified a profound change between the human groups associated with the two phases of occupation recorded in the funerary monument.
Before the population decline, the burials were linked to a different community from the one that returned to use the tomb centuries later, already in a context of social reorganization and more dispersed occupation of the territory.
In the second phase, the individuals showed ancestry linked to Neolithic populations coming from the south, with a strong connection to the Iberian Peninsula.
The discovery indicates that the region was not just reoccupied by the same local descendants but received new groups after the weakening of the ancient farming communities.
This replacement also appears in the funerary rituals and family relations observed at the site.
The first phase shows more concentrated kinship structures, while the later phase reveals another social organization, suggesting changes in how these populations lived, buried their dead, and maintained community ties.
Agricultural abandonment allowed forests to advance
In addition to genetic evidence, environmental records also reinforce the hypothesis of a widespread and prolonged population reduction in different regions of northwestern Europe during the end of the Neolithic period.
In various areas previously occupied by farmers and herders, studies point to the retraction of agricultural cultivation and the gradual advancement of forests over territories that were once intensely exploited by human communities.
This return of vegetation does not signify a simple local displacement, but a deeper interruption of human occupation in certain territories.
With fewer people working the land, agricultural fields were abandoned, settlements lost continuity, and cultural practices associated with the Late Neolithic went into decline.
The construction and use of megalithic tombs also decreased during this period.
These monuments, which depended on collective organization and social stability, ceased to be erected or used in various regions, suggesting a crisis that affected both demography and forms of community life.
Infectious diseases may have accelerated the Neolithic decline
In genetic analyses conducted on human remains from the period, researchers identified traces of infectious agents, including Yersinia pestis, a bacterium associated with plague, and Borrelia recurrentis, related to relapsing fever.
Thus, the hypothesis gained strength that epidemic outbreaks may have played an important role in the decline of these populations, although experts emphasize that diseases alone do not explain the entire dimension of the crisis.
Previous studies with human remains from Scandinavia also found signs of plague in Neolithic communities.
In some cases, the presence of the pathogen appeared in different generations, leading researchers to consider the possibility of successive outbreaks in populations already pressured by other factors.
Even so, specialists treat the collapse as a multifactorial phenomenon.
The combination of diseases, decline in agricultural production, environmental changes, and possible resource disputes would have increased the vulnerability of these communities, making demographic recovery more difficult.
Migrations transformed ancient European communities
After the period of demographic retraction, different population movements began to alter the human composition of various regions of the European continent over the following centuries.
In the Paris Basin, for example, groups with ancestry linked to southern Europe and the Iberian Peninsula occupied areas that were previously inhabited by ancient local farming communities.
In Scandinavia and other parts of Europe, populations related to the Pontic-Caspian steppes gained presence in the following centuries.
These migrations did not occur in isolation.
They are part of a scenario of strong social transformation, in which old kinship networks, funerary practices, and agricultural traditions have lost space to new forms of organization.
The case of Bury helps to show that the disappearance of Neolithic populations was not necessarily a single and sudden event.
The evidence points to a prolonged process, with interruptions, abandonment of territories, arrival of new groups, and gradual reconstruction of communities in previously emptied areas.
Bury Tomb Preserved Signs of an Ancient Demographic Crisis
A large part of the archaeological relevance of the Bury tomb is related to the historical sequence preserved at the funerary site throughout different phases of human occupation.
In this context, the interval without burials functions as a concrete marker of the population crisis, while the DNA of individuals buried before and after this period shows that the later population did not represent a direct continuity of the previous one.
By combining genetics, archaeology, and environmental data, researchers are able to observe a rare transition in detail.
The site shows the weakening of a group, the temporary abandonment of a funerary practice, and the arrival of people with a different ancestral origin, at a time of profound reorganization of prehistoric Europe.
The discovery also helps to explain why so many megalithic tombs ceased to be used at the end of the fourth millennium BC.
Without population stability and with reduced or displaced communities, large collective projects lost social function and continuity capacity.
The Neolithic decline, therefore, does not just represent the mysterious disappearance of ancient populations.
It reveals a demographic and cultural crisis marked by diseases, environmental changes, agricultural abandonment, and migrations, whose effects altered the human composition of entire regions of Europe.
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