Out of Africa: Did humans migrate quickly and all-at-once or in phases based on weather?

Map showing location of the study site and extent of bajada system in southeast Arabia, including other identified sections of the Al Ain fan (UAE—United Arab Emirates).

Considerable debate surrounds the migration of human populations out of Africa. Two predominant hypotheses concerning the timing contrast in their emphasis on the role of the Arabian interior and its changing climate. In one scenario, human populations expanded rapidly from Africa to southern Asia via the coastlines of Arabia approx. 50,000 to 60,000 years ago. Another model suggests that dispersal into the Arabian interior began much earlier (approx. 75,000 to 130,000 years ago) during multiple phases, when increased rainfall provided sufficient freshwater to support expanding populations.

Ash Parton and colleagues fall into the second camp, writing, "The dispersal of early human populations out of Africa is dynamically linked with the changing climate [...] sciencedaily.com / Link 2


Actualización 23-02-15: ¿Los antiguos seres humanos migraron fuera de África de una sola vez o lo hicieron por fases, de acuerdo con el clima?
(Traducción de G.C.C. para Terrae Antiqvae)