Free Newsletters - Space - Defense - Environment - Energy - Solar - Nuclear
by Staff Writers
York, England (UPI) May 28, 2013
Rugged landscapes in East and South Africa may have helped evolve humans' earliest ancestors from tree-dwelling quadrupeds to upright bipeds, scientists say.
Researchers at Britain's York University, working with French colleagues, say humans' upright gait may have its origins in prehistoric landscapes shaped during the Pliocene epoch by volcanoes and shifting tectonic plates.
Early hominins would have been attracted to the resulting terrain of rocky outcrops and gorges because they offered shelter and opportunities to trap prey but those same landscapes would have required more upright scrambling and climbing gaits, prompting the evolution of bipedalism, the researchers said.
That theory challenges traditional hypotheses that humans' early ancestors were forced out of the trees and onto two feet when tree cover declined because of climate change.
"Our research shows that bipedalism may have developed as a response to the terrain, rather than a response to climatically-driven vegetation changes," York researcher Isabelle Winder said in a university release.
"The broken, disrupted terrain offered benefits for hominins in terms of security and food, but it also proved a motivation to improve their locomotor skills by climbing, balancing, scrambling and moving swiftly over broken ground -- types of movement encouraging a more upright gait."
That would have left the hands and arms of upright hominins free to develop increased manual dexterity and tool use, supporting a further key stage in the evolutionary story, the researchers suggested.
All About Human Beings and How We Got To Be Here
|The content herein, unless otherwise known to be public domain, are Copyright 1995-2014 - Space Media Network. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA Portal Reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. Advertising does not imply endorsement,agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. Privacy Statement|