Late Pleistocene human population bottlenecks, volcanic winter, and differentiation of modern humans.

  title={Late Pleistocene human population bottlenecks, volcanic winter, and differentiation of modern humans.},
  author={Stanley H. Ambrose},
  journal={Journal of human evolution},
  volume={34 6},
  • S. Ambrose
  • Published 1 June 1998
  • Environmental Science, Geography
  • Journal of human evolution
The "Weak Garden of Eden" model for the origin and dispersal of modern humans (Harpending et al., 1993) posits that modern humans spread into separate regions from a restricted source, around 100 ka (thousand years ago), then passed through population bottlenecks. Around 50 ka, dramatic growth occurred within dispersed populations that were genetically isolated from each other. Population growth began earliest in Africa and later in Eurasia and is hypothesized to have been caused by the… 

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