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Did Lucy walk, climb, or both?
Date:12/31/2012

Much has been made of our ancestors "coming down out of the trees," and many researchers view terrestrial bipedalism as the hallmark of "humanness." After all, most of our living primate relativesthe great apes, specificallystill spend their time in the trees. Humans are the only member of the family devoted to the ground, living terrestrial rather than arboreal lives, but that wasn't always the case.

The fossil record shows that our predecessors were arboreal habitus, that is, until Lucy arrived on the scene. About 3.5 million years ago in Africa, this new creature, Australopithecus afarensis, appeared; Lucy was the first specimen discovered. Anthropologists agree that A. afarensis was bipedal, but had Lucy and her legions totally forsaken the trees? The question is at the root of a controversy that still rages.

"Australopithecus afarensis possessed a rigid ankle and an arched, nongrasping foot," write Nathaniel Dominy and his co-authors in Proceedings of the National Academy of Sciences (PNAS). "These traits are widely interpreted as being functionally incompatible with climbing and thus definitive markers of terrestriality," says Dominy, an associate professor of anthropology at Dartmouth.

But not so fast; this interpretation may be a rush to judgment in light of new evidence brought to light by Dominy and his colleagues. They did what anthropologists do. They went out and looked at modern humans who, like Lucy, have feet adapted to terrestrial bipedalism, and found these people can still function as effective treeclimbers.

Co-authors Vivek Venkataraman and Thomas Kraft collaborated with Dominy on field studies in the Philippines and Africa that inform their PNAS paper. Venkataraman and Kraft are Dartmouth graduate students in the Ecology and Evolutionary Biology PhD program in the Department of Biological Sciences, and are supported by National Science Foundation graduate res
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Contact: John Cramer
John.D.Cramer@dartmouth.edu
603-646-9130
Dartmouth College
Source:Eurekalert  

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