Sexual dimorphism in Australopithecus afarensis was similar to that of modern humans

Philip L. Reno, Richard S. Meindl, Melanie A. McCollum, C. Owen Lovejoy

Research output: Contribution to journalArticle

136 Citations (Scopus)

Abstract

The substantial fossil record for Australopithecus afarensis includes both an adult partial skeleton [Afar Locality (A.L.) 288-1, "Lucy"] and a large simultaneous death assemblage (A.L. 333). Here we optimize data derived from both to more accurately estimate skeletal size dimorphism. Postcranial ratios derived from A.L. 288-1 enable a significant increase in sample size compared with previous studies. Extensive simulations using modern humans, chimpanzees, and gorillas confirm that this technique is accurate and that skeletal size dimorphism in A. afarensis was most similar to that of contemporary Homo sapiens. These data eliminate some apparent discrepancies between the canine and skeletal size dimorphism in hominoids, imply that the species was not characterized by substantial sexual bimaturation, and greatly increase the probability that the reproductive strategy of A. afarensis was principally monogamy.

Original languageEnglish (US)
Pages (from-to)9404-9409
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume100
Issue number16
DOIs
StatePublished - Aug 5 2003

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Sex Characteristics
Gorilla gorilla
Fossils
Pan troglodytes
Skeleton
Sample Size
Canidae

All Science Journal Classification (ASJC) codes

  • General

Cite this

Reno, Philip L. ; Meindl, Richard S. ; McCollum, Melanie A. ; Lovejoy, C. Owen. / Sexual dimorphism in Australopithecus afarensis was similar to that of modern humans. In: Proceedings of the National Academy of Sciences of the United States of America. 2003 ; Vol. 100, No. 16. pp. 9404-9409.
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Sexual dimorphism in Australopithecus afarensis was similar to that of modern humans. / Reno, Philip L.; Meindl, Richard S.; McCollum, Melanie A.; Lovejoy, C. Owen.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 100, No. 16, 05.08.2003, p. 9404-9409.

Research output: Contribution to journalArticle

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