Digit ratios predict polygyny in early apes, Ardipithecus , Neanderthals and early modern humans but not in Australopithecus



Nelson, Emma ORCID: 0000-0002-6302-3352, Rolian, Campbell, Cashmore, Lisa and Shultz, Susanne
(2011) Digit ratios predict polygyny in early apes, Ardipithecus , Neanderthals and early modern humans but not in Australopithecus. Proceedings of the Royal Society B: Biological Sciences, 278 (1711). 1556 - 1563.

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Abstract

<jats:p> Social behaviour of fossil hominoid species is notoriously difficult to predict owing to difficulties in estimating body size dimorphism from fragmentary remains and, in hominins, low canine size dimorphism. Recent studies have shown that the second-to-fourth digit ratio (2D : 4D), a putative biomarker for prenatal androgen effects (PAEs), covaries with intra-sexual competition and social systems across haplorrhines; non-pair-bonded polygynous taxa have significantly lower 2D : 4D ratios (high PAE) than pair-bonded monogamous species. Here, we use proximal phalanx ratios of extant and fossil specimens to reconstruct the social systems of extinct hominoids. <jats:italic>Pierolapithecus catalaunicus</jats:italic> , <jats:italic>Hispanopithecus laietanus</jats:italic> and <jats:italic>Ardipithecus ramidus</jats:italic> have ratios consistent with polygynous extant species, whereas the ratio of <jats:italic>Australopithecus afarensis</jats:italic> is consistent with monogamous extant species. The early anatomically modern human Qafzeh 9 and Neanderthals have lower digit ratios than most contemporary human populations, indicating increased androgenization and possibly higher incidence of polygyny. Although speculative owing to small sample sizes, these results suggest that digit ratios represent a supplementary approach for elucidating the social systems of fossil hominins. </jats:p>

Item Type: Article
Depositing User: Symplectic Admin
Date Deposited: 11 Jan 2016 11:42
Last Modified: 26 Feb 2021 08:13
DOI: 10.1098/rspb.2010.1740
URI: https://livrepository.liverpool.ac.uk/id/eprint/2045680