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Did the orientation of the continents hinder ancient settlement of the Americas?
Date:9/21/2011

In an intriguing original look at the history of the first Americans, a new study finds evidence that the north-south orientation of the American continents slowed the spread of populations and technology, compared to the east-west axis of Eurasia. The research, published in the American Journal of Physical Anthropology, is part of a special section which explores who the first Americans were and how they were able to settle in the last great unexplored habitat.

The research, by Sohini Ramachandran and Noah Rosenberg, from Brown University and Stanford University respectively, uses genetic information to explore the effects of continental axes and climates on human migration and adaptation across the Americas.

"It has been proposed that the east-west orientation of the Eurasian landmass aided the rapid spread of ancient technological innovations, while the north-south orientation of the Americas led to a slower diffusion of technology there," said Ramachandran. "Our research develops this idea, arguing that continental orientation influenced migration patterns and played an important role in determining the structure of human genetic variation and the distribution and spread of cultural traits."

The research supports the idea that technological diffusion was accelerated across Eurasia because populations with the same latitude experience similar climates, making adaptation to new locations easier for domesticated animals, plants and consequently humans. Alternatively, migrating along lines of longitude involves adapting to new climates.

"The idea that technology was diffused along latitudinal lines was proposed by Jared Diamond in 1997, but if this is correct and the spread of technology was accompanied by human migrations it follows that a comparative study into genetic variation would reveal a signature of greater genetic differences between populations along lines of longitude in the Americas than that in Eurasia a
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Contact: Ben Norman
Lifesciencenews@wiley.com
44-124-377-0375
Wiley-Blackwell
Source:Eurekalert

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