The Neolithic Revolution has long sparked debate: Did it arise from local developments or through large-scale migration? Recent research in paleogenomics, published in Nature, sheds light on this question. Scientists examined DNA from Moroccan sites, including Kaf Taht el-Ghar, which dates back over 7,400 years. The findings reveal that agriculture in the Maghreb developed through multiple routes. European farmers likely crossed the Strait of Gibraltar by sea, indigenous people adopted new farming techniques, and pastoralists from the Levant arrived later. This mix of influences formed a genetic blend that underpins modern Maghrebi populations, including the Imazighen (Berbers).
Three Distinct Ancestral Components
According to the study published in Nature, researchers uncovered a major discovery: Three distinct ancestral components came together in the Maghreb around 7,400 to 6,300 years ago. At Kaf Taht el-Ghar, scientists found individuals with ancestry closely related to early European farmers from Iberia. This finding demonstrates that farming was not merely an idea that spread but was physically brought by individuals who crossed the Mediterranean much earlier than previously thought.
Indigenous Adoption of Neolithic Practices
European migrants brought agriculture, but DNA from the Ifri n'Amr Ou Moussa site represents the Late Pleistocene/Epipaleolithic indigenous baseline. These individuals had purely local ancestry, yet they were already using pottery and farming tools. This points to a 'dual model,' where indigenous groups adopted Neolithic 'packages' while maintaining genetic isolation for several centuries before eventually merging.
How Near East Herders Reached Morocco
About 1,000 years after the first farmers appeared, a third major genetic component arrived from the Levant (Near East) via the 'Green Sahara' corridor. This DNA, found in remains at Skhirat-Rouazi, relates to the spread of pastoralism—the practice of herding sheep and goats. These groups traveled westward across what is known as the 'Green Sahara,' eventually mingling with local populations and those descended from Europeans. This blending created the mixed ancestry seen in later North African history.
The 'Green Sahara' Defined Regional Ancestry
The research shows that the unique genetic mix from the Neolithic era is key to the ancestry of today's North Africans. This mix came from indigenous foragers, Iberian farmers, and Levantine herders. When scientists compared ancient DNA with modern populations, they discovered that groups like the Imazighen (Berbers) still retain this 7,000-year-old genetic 'mosaic.' Although later events, such as Roman, Vandal, and Arab expansions, altered cultures in the region, the fundamental biological roots were mostly established during the African Humid Period (AHP).
This study underscores the complexity of human migration and cultural exchange, providing a clearer picture of how early farming societies emerged and evolved in North Africa.
