The great flowering of human evolution over the past 2
million years may have been driven not by the African savannahs, but by
the lakes of that continent's Great Rift Valley. This novel idea,
published this week, may explain why every major advance in the
evolution of early humans, from speciation to the vast increase in brain
size, appears to have taken place in eastern Africa.
Anthropologists have surmised for several years that early humans, or hominins, might have evolved their unusually large, powerful brains to cope with an increasingly variable climate
over the past few million years. However, studies testing this
hypothesis have been equivocal, perhaps because most use global or
continental-scale measures of climate, such as studying trends in the
amount of airborne dust from dry earth that is blown into the ocean and
incorporated into deep-sea sediments.
Mark Maslin, a palaeoclimatologist at University College London, and his colleague Susanne Shultz
at the University of Manchester, UK, have taken a local approach
instead, by studying whether the presence or absence of lakes in the
Rift Valley affected the hominins living there. [...] newscientist.com/ (B&W3)
Citation: Shultz S, Maslin M (2013) Early Human Speciation, Brain Expansion and Dispersal Influenced by African Climate Pulses. PLoS ONE 8(10): e76750. doi:10.1371/journal.pone.0076750
Citation: Shultz S, Maslin M (2013) Early Human Speciation, Brain Expansion and Dispersal Influenced by African Climate Pulses. PLoS ONE 8(10): e76750. doi:10.1371/journal.pone.0076750
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