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Tuesday, January 3, 2012

Cultural Diversification Also Drives Human Evolution

Cultural Diversification Also Drives Human Evolution
ScienceDaily (Dec. 22, 2011) — Changes in social structure and cultural practices can also contribute to human evolution, according to a study that has recently been published in the journal Proceedings of the National Academy of Sciences (PNAS), contributed to by the lecturer Mireia Esparza and assistant Neus Martínez-Abadías, from the Anthropology Unit of the UB's Department of Animal Biology.

Indigenous peoples of the Americas
The study, coordinated by the expert Rolando González-José from the Patagonian National Research Center (CENPAT-CONICET, Argentina), examines physical, genetic, geographical and climatic patterns affecting over 1,200 people from the Baniwa, Ticuna, Yanomami, Kaingang, Xavánte and Kayapó indigenous groups of the Brazilian Amazon and Central Plateau.
According to the experts behind the study, one of the most interesting results is the rapid rate of morphological change in the Xavánte, which is up to 3.8 times faster than in the other groups studied. The changes observed in the Xavánte -- who have larger heads, narrower faces and broader noses -- follow an integration pattern of human skull shape recently described in the literature. "This study demonstrates that when selection acts in the same direction as integration patterns, evolution is favoured," explain the researchers Mireia Esparza and Neus Martínez-Abadías, who co-authored another recent study on morphometric patterns and the evolutionary potential of the human skull ( see
The study suggests that this divergence is also independent of the Xavánte's geographical separation from other population groups and differences in climate. According to the team of experts, the combination of cultural isolation and sexual selection could be the driving force behind the changes observed. To conclude their study, the authors hypothesize that gene-culture co-evolution could in fact be the dominant model throughout the history of the human evolutionary lineage.
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The above story is reprinted from materials provided by Universidad de Barcelona, via AlphaGalileo.
Note: Materials may be edited for content and length. For further information, please contact the source cited above.
Journal Reference:
T. Hunemeier, J. Gomez-Valdes, M. Ballesteros-Romero, S. de Azevedo, N. Martinez-Abadias, M. Esparza, T. Sjovold, S. L. Bonatto, F. M. Salzano, M. C. Bortolini, R. Gonzalez-Jose. Cultural diversification promotes rapid phenotypic evolution in Xavante Indians. Proceedings of the National Academy of Sciences, 2011; DOI: 10.1073/pnas.1118967109
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Universidad de Barcelona (2011, December 22). Cultural diversification also drives human evolution. ScienceDaily. Retrieved January 3, 2012, from­ /releases/2011/12/111222161213.htm
Note: If no author is given, the source is cited instead.
Disclaimer: This article is not intended to provide medical advice, diagnosis or treatment. Views expressed here do not necessarily reflect those of ScienceDaily or its staff.

Father and son in the wai’a ceremony at the Xavánte village of Etéñitepa. (Credit: Francisco M. Salzano)
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See Also:
Mind & Brain
Social Psychology
Fossils & Ruins
Science & Society
Resource Shortage
Scientific Conduct
Genetic drift
The Genographic Project
Homo rudolfensis

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