A new study finds that neither climate change nor competition with early modern humans fully explains the Neanderthal extinction from Europe roughly 40,000 years ago. The research challenges long-held assumptions about what wiped out these ancient people.
The study was led by Ariane Burke, an anthropologist at the University of Montreal’s Department of Anthropology. Her team used habitat modeling and geographic analysis tools to map where Neanderthals and early Homo sapiens lived across Europe during a period of sharp climate swings.
The findings, published in Quaternary Science Reviews, point to a far more complicated story shaped by geography, population structure, and regional differences.
The models showed that suitable habitat for Neanderthals remained available across Europe even during the coldest periods, known as stadials. Climate stress alone was not enough to account for Neanderthal extinction.
Key refuges in southwestern Europe, particularly in the Franco-Cantabrian region and southern Iberia, held stable conditions that could have supported populations through climate downturns and allowed for recovery afterward.
Southwest Europe held firm as a crucial climate refuge
For Homo sapiens, the picture looked different. Their habitat quality improved significantly during warmer periods called interstadials. Burke and colleagues found that Sapiens populations most likely spread westward along Mediterranean coastal routes during those warmer windows.
The study also found that Neanderthal and Sapiens territories overlapped, but only slightly. The overlap never exceeded 5 percent of the available habitat for either group.
Burke explained that differences in how each group used the landscape likely reduced direct pressure between them. This finding weakens the argument that resource competition drove Neanderthals out.
A more telling vulnerability emerged in the structure of Neanderthal social networks. Their regional connections were weak, particularly between western and southeastern Europe.
Sapiens networks, by contrast, were better linked across the continent. This gap left Neanderthal populations more exposed to random events and demographic pressures, including gradual genetic absorption into the expanding Sapiens gene pool.
Neanderthal extinction neither driven by climate nor competition
The regional picture also varied considerably. In Western Europe, where the core habitats of both groups overlapped, Sapiens may have played a more direct role in the decline of local Neanderthal populations.
In southeastern Europe, weakly connected Neanderthal groups may have been undone more by internal demographic and genetic vulnerabilities than by outside pressure.
Burke and the research team concluded that the replacement of Neanderthals was not a single uniform event driven by one cause. It was the outcome of different pressures playing out in different ways across the continent.
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