A latest study utilizing advanced spatial modeling has revealed that neither climate change nor direct competition with early modern humans can fully explain the disappearance of Neanderthals from Europe. The research, which adapted models typically used in conservation biology, suggests that the structure of social networks and regional connectivity played a far more critical role in the survival of Homo sapiens and the eventual extinction of our closest ancient relatives.
The study has focused on Europe during Marine Isotope Stage 3 (MIS 3), a period spanning roughly 60,000 to 35,000 years ago. This era was characterized by dramatic climate fluctuations, alternating between intense cold stadials and warmer interstadials. It was during this volatile period that the first populations of Homo sapiens established a permanent presence in Europe, while the last Neanderthals vanished from the archaeological record.
The study, led by Ariane Burke from the Université de Montréal is published in Quaternary Science Reviews.
Neanderthal skull discovered in 1848 at Forbes' Quarry, Gibraltar. (AquilaGib / CC BY-SA 3.0)
Modeling Prehistoric Habitats and Networks
To understand the dynamics of this population replacement, the research team employed species distribution models - a technique commonly used in digital ecology to predict where a species could live based on observation data. In this case, archaeological sites served as "presence points" for both Neanderthals and Homo sapiens. By incorporating geographical data and climate variability indices, the researchers created habitat suitability models to identify "core" regions that could support stable populations.
Crucially, the study found that suitable habitat for Neanderthals persisted across Europe even during the harshest climate downturns. Key refuges in southwestern Europe, particularly in southern Iberia and the Franco-Cantabrian region, maintained stable conditions that could have allowed populations to survive and recover. This finding directly challenges the long-held hypothesis that climate change alone caused the demise of Neanderthals, as they had successfully navigated previous glacial cycles.
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Artistic reconstruction of a Neanderthal man at the Natural History Museum, London. (Werner Ustorf / CC BY-SA 2.0)
The Power of Social Connectivity
If climate stress and habitat loss were not the primary culprits, what gave Homo sapiens the evolutionary edge? The answer, according to the models, lies in the topology of their social networks. The core regions favorable to Homo sapiens were found to be highly connected, allowing different groups to form expansive interregional networks.
"These networks act as a safety net," explained Ariane Burke in a statement to UdeMnouvelles. "They allow for the exchange of information on resources and animal migrations, the forming of partnerships, and temporary access to other territories in the event of a crisis."
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While Neanderthals also maintained connections between groups, their networks were relatively tenuous, especially in Central and Eastern Europe. This lack of connectivity left isolated Neanderthal populations highly vulnerable to demographic shocks and unpredictable environmental variability. In contrast, the robust networks of Homo sapiens facilitated resilience and rapid recovery. This supports previous research suggesting that prehistoric humans are likely to have formed mating networks to avoid inbreeding, a strategy that may have been less effective among fragmented Neanderthal groups.
A Complex and Regional Extinction
The study also weakens the argument that direct competition for resources drove the Neanderthal extinction. The models indicated that the territories of the two species overlapped only slightly, never exceeding five percent of the available habitat for either group. Subtle differences in how each group utilized the landscape likely reduced direct pressure between them.
Instead, the replacement of Neanderthals by modern humans was a complex process that varied significantly by region. In Western Europe, where core habitats overlapped more closely, the arrival of Homo sapiens may have added critical stress to Neanderthal populations that were already demographically vulnerable. In Eastern Europe, weakly connected groups may have succumbed to internal demographic pressures and gradual genetic absorption into the expanding Homo sapiens gene pool, aligning with findings that geneticists show how Neanderthals never really went extinct.
Ultimately, the demise of the Neanderthals was not a single, uniform event. It was the result of an intricate interplay of climate instability, geographic isolation, demographic vulnerabilities, and complex interspecific interactions, including human-Neanderthal interbreeding. As Burke noted, these ancient dynamics serve as a reminder that human survival has always depended not just on intelligence and technology, but on our fundamental ability to forge and maintain connections.
Top image: Portrayal of Neanderthal Flintworkers, Le Moustier Cavern, Dordogne, France (cropped). Source: Charles R. Knight / Public domain
By Gary Manners
References
Burke, A., Pomeroy, E., Poisot, T., Albouy, B., & Paquin, S. 2026. Spatial resilience and population replacement in Europe during MIS 3: a comparative study of Neanderthals and H. sapiens. Quaternary Science Reviews. Elsevier. Available at: https://doi.org/10.1016/j.quascirev.2026.109850
Moeed, A. 2026. Mystery of Neanderthal Extinction Deepens as Study Finds Climate and Competition Not Sole Causes. GreekReporter.com. Available at: https://greekreporter.com/2026/04/25/mystery-neanderthal-extinction-climate-competition/
St-Cyr-Leroux, B. 2026. Why did the Neanderthals disappear?. UdeMnouvelles. Université de Montréal. Available at: https://nouvelles.umontreal.ca/en/article/2026/04/22/why-did-the-neanderthals-disappear
Unknown Author. 2026. The Network Problem: What Spatial Modeling Reveals About Neanderthal Extinction. Anthropology.net. Available at: https://www.anthropology.net/p/the-network-problem-what-spatial
