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Longevity unlikely to have factored into the extinction of Neanderthals

Date:
January 11, 2011
Source:
Washington University in St. Louis
Summary:
Life expectancy was probably the same for early modern and late archaic humans and did not factor in the extinction of Neanderthals, suggests a new study.
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Life expectancy was probably the same for early modern and late archaic humans and did not factor in the extinction of Neanderthals, suggests a new study by a Washington University in St. Louis anthropologist.

Erik Trinkaus, PhD, Professor of Anthropology in Arts & Sciences, examined the fossil record to assess adult mortality for both groups, which co-existed in different regions for roughly 150,000 years. Trinkaus found that the proportions of 20 to 40-year-old adults versus adults older than 40, were about the same for early modern humans and Neandertals.

This similar age distribution, says Trinkaus, reflects similar patterns of adult mortality and treatment of the elderly in the context of highly mobile hunting-and-gathering human populations.

The study, "Late Pleistocene Adult Mortality Patterns and Modern Human Establishment, was published the week of Jan. 10, 2011 in the Proceedings of the National Academy of Sciences.

Older individuals are rarely found among the remains of late archaic humans, which has prompted some researchers to propose that Neandertals had an inherently shorter life expectancy, contributing to their demise.

However, if early modern humans did have a demographic advantage, Trinkaus argues, it was more likely due to high fertility rates and lower infant mortality.

"If indeed there was a demographic advantage for early modern humans, at least during transitional phases of Late Pleistocene human evolution, it must have been the result of increased fertility and/or reduced immature mortality," writes Trinkaus in the paper's conclusion. "Neither adult longevity nor proposed modest shifts in developmental rates are likely to have played a role in this demographic transition.


Story Source:

The above post is reprinted from materials provided by Washington University in St. Louis. The original item was written by Neil Schoenherr. Note: Materials may be edited for content and length.


Journal Reference:

  1. E. Trinkaus. Late Pleistocene adult mortality patterns and modern human establishment. Proceedings of the National Academy of Sciences, 2011; DOI: 10.1073/pnas.1018700108

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Washington University in St. Louis. "Longevity unlikely to have factored into the extinction of Neanderthals." ScienceDaily. ScienceDaily, 11 January 2011. <www.sciencedaily.com/releases/2011/01/110111133254.htm>.
Washington University in St. Louis. (2011, January 11). Longevity unlikely to have factored into the extinction of Neanderthals. ScienceDaily. Retrieved September 4, 2015 from www.sciencedaily.com/releases/2011/01/110111133254.htm
Washington University in St. Louis. "Longevity unlikely to have factored into the extinction of Neanderthals." ScienceDaily. www.sciencedaily.com/releases/2011/01/110111133254.htm (accessed September 4, 2015).

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