Why Did Early Humans Migrate Out Of Africa
Camila Farah
To avoid competition for resources with other humans a band of humans is likely to move just far enough so that they are out of the foraging range of other bands.
The development of genetic analysis tools in the 1980s helped scientists grow attracted to the out of africa hypothesis. Out of africa was only established in the 90 s during a debate as to the age of modern humans. Early modern human expansion in sub saharan africa appears to have contributed to the end of late acheulean industries at about 130 000 years ago although very late coexistence of archaic and early modern humans until as late as 12 000 years ago has been argued for west africa in particular. These hominins may have been either australopithicines or more likely an unknown species of homo similar in appearance to homo habilis.
However an alternate theory proposes that hominins migrated out of africa before homo ergaster evolved possibly about 2 million years ago prior to the earliest dates of homo erectus in asia. About spencer wells humans have remarkably little genetic variation for a species of large apes. And while louise leakey and her family proved that through prehistoric bones and fossils spencer wells looks for the evidence of our common origins in living breathing human beings. While early expansions to eurasia appear not to have persisted expansions to southern and central africa resulted in the deepest temporal divergence in living human populations.
It s better to view the movements of early humans as dispersal or a spreading out. Experts suggest that droughts in africa led to starvation and humans were driven to near extinction before they ever had a chance to explore the world. Most likely a change in climate helped to push them out. He s using the tools of molecular genetics to figure out when human populations began to migrate from africa and spread across the globe.
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Researchers of human evolution awoke to exciting and provocative news from the journal nature on wednesday.
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