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From Lucy to Kadanuumuu: balanced analyses of Australopithecus afarensis assemblages confirm only moderate skeletal dimorphism

Identifieur interne : 000088 ( Pmc/Curation ); précédent : 000087; suivant : 000089

From Lucy to Kadanuumuu: balanced analyses of Australopithecus afarensis assemblages confirm only moderate skeletal dimorphism

Auteurs : Philip L. Reno [États-Unis] ; C. Owen Lovejoy [États-Unis]

Source :

RBID : PMC:4419524

Abstract

Sexual dimorphism in body size is often used as a correlate of social and reproductive behavior in Australopithecus afarensis. In addition to a number of isolated specimens, the sample for this species includes two small associated skeletons (A.L. 288-1 or “Lucy” and A.L. 128/129) and a geologically contemporaneous death assemblage of several larger individuals (A.L. 333). These have driven both perceptions and quantitative analyses concluding that Au. afarensis was markedly dimorphic. The Template Method enables simultaneous evaluation of multiple skeletal sites, thereby greatly expanding sample size, and reveals that A. afarensis dimorphism was similar to that of modern humans. A new very large partial skeleton (KSD-VP-1/1 or “Kadanuumuu”) can now also be used, like Lucy, as a template specimen. In addition, the recently developed Geometric Mean Method has been used to argue that Au. afarensis was equally or even more dimorphic than gorillas. However, in its previous application Lucy and A.L. 128/129 accounted for 10 of 11 estimates of female size. Here we directly compare the two methods and demonstrate that including multiple measurements from the same partial skeleton that falls at the margin of the species size range dramatically inflates dimorphism estimates. Prevention of the dominance of a single specimen’s contribution to calculations of multiple dimorphism estimates confirms that Au. afarensis was only moderately dimorphic.


Url:
DOI: 10.7717/peerj.925
PubMed: 25945314
PubMed Central: 4419524

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PMC:4419524

Le document en format XML

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<p>Sexual dimorphism in body size is often used as a correlate of social and reproductive behavior in
<italic>Australopithecus afarensis</italic>
. In addition to a number of isolated specimens, the sample for this species includes two small associated skeletons (A.L. 288-1 or “Lucy” and A.L. 128/129) and a geologically contemporaneous death assemblage of several larger individuals (A.L. 333). These have driven both perceptions and quantitative analyses concluding that
<italic>Au. afarensis</italic>
was markedly dimorphic. The Template Method enables simultaneous evaluation of multiple skeletal sites, thereby greatly expanding sample size, and reveals that
<italic>A. afarensis</italic>
dimorphism was similar to that of modern humans. A new very large partial skeleton (KSD-VP-1/1 or “Kadanuumuu”) can now also be used, like Lucy, as a template specimen. In addition, the recently developed Geometric Mean Method has been used to argue that
<italic>Au. afarensis</italic>
was equally or even more dimorphic than gorillas. However, in its previous application Lucy and A.L. 128/129 accounted for 10 of 11 estimates of female size. Here we directly compare the two methods and demonstrate that including multiple measurements from the same partial skeleton that falls at the margin of the species size range dramatically inflates dimorphism estimates. Prevention of the dominance of a single specimen’s contribution to calculations of multiple dimorphism estimates confirms that
<italic>Au. afarensis</italic>
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</TEI>
<pmc article-type="research-article">
<pmc-dir>properties open_access</pmc-dir>
<front>
<journal-meta>
<journal-id journal-id-type="nlm-ta">PeerJ</journal-id>
<journal-id journal-id-type="iso-abbrev">PeerJ</journal-id>
<journal-id journal-id-type="pmc">PeerJ</journal-id>
<journal-id journal-id-type="publisher-id">PeerJ</journal-id>
<journal-title-group>
<journal-title>PeerJ</journal-title>
</journal-title-group>
<issn pub-type="epub">2167-8359</issn>
<publisher>
<publisher-name>PeerJ Inc.</publisher-name>
<publisher-loc>San Francisco, USA</publisher-loc>
</publisher>
</journal-meta>
<article-meta>
<article-id pub-id-type="pmid">25945314</article-id>
<article-id pub-id-type="pmc">4419524</article-id>
<article-id pub-id-type="publisher-id">925</article-id>
<article-id pub-id-type="doi">10.7717/peerj.925</article-id>
<article-categories>
<subj-group subj-group-type="heading">
<subject>Anthropology</subject>
</subj-group>
<subj-group subj-group-type="heading">
<subject>Paleontology</subject>
</subj-group>
</article-categories>
<title-group>
<article-title>From Lucy to Kadanuumuu: balanced analyses of
<italic>Australopithecus afarensis</italic>
assemblages confirm only moderate skeletal dimorphism</article-title>
</title-group>
<contrib-group>
<contrib id="author-1" contrib-type="author" corresp="yes">
<name>
<surname>Reno</surname>
<given-names>Philip L.</given-names>
</name>
<xref ref-type="aff" rid="aff-1">1</xref>
<email>philreno@psu.edu</email>
</contrib>
<contrib id="author-2" contrib-type="author">
<name>
<surname>Lovejoy</surname>
<given-names>C. Owen</given-names>
</name>
<xref ref-type="aff" rid="aff-2">2</xref>
</contrib>
<aff id="aff-1">
<label>1</label>
<institution>Department of Anthropology, The Pennsylvania State University</institution>
,
<addr-line>University Park, PA</addr-line>
,
<country>USA</country>
</aff>
<aff id="aff-2">
<label>2</label>
<institution>Department of Anthropology and School of Biomedical Sciences, Kent State University</institution>
,
<addr-line>Kent, OH</addr-line>
,
<country>USA</country>
</aff>
</contrib-group>
<contrib-group>
<contrib id="editor-1" contrib-type="editor">
<name>
<surname>Jungers</surname>
<given-names>William</given-names>
</name>
</contrib>
</contrib-group>
<pub-date pub-type="epub" date-type="pub" iso-8601-date="2015-04-28">
<day>28</day>
<month>4</month>
<year iso-8601-date="2015">2015</year>
</pub-date>
<pub-date pub-type="collection">
<year>2015</year>
</pub-date>
<volume>3</volume>
<elocation-id>e925</elocation-id>
<history>
<date date-type="received" iso-8601-date="2015-02-24">
<day>24</day>
<month>2</month>
<year iso-8601-date="2015">2015</year>
</date>
<date date-type="accepted" iso-8601-date="2015-04-09">
<day>9</day>
<month>4</month>
<year iso-8601-date="2015">2015</year>
</date>
</history>
<permissions>
<copyright-statement>© 2015 Reno and Lovejoy</copyright-statement>
<copyright-year>2015</copyright-year>
<copyright-holder>Reno and Lovejoy</copyright-holder>
<license license-type="open-access" xlink:href="http://creativecommons.org/licenses/by/4.0/">
<license-p>This is an open access article distributed under the terms of the
<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">Creative Commons Attribution License</ext-link>
, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.</license-p>
</license>
</permissions>
<self-uri xlink:href="https://peerj.com/articles/925"></self-uri>
<abstract>
<p>Sexual dimorphism in body size is often used as a correlate of social and reproductive behavior in
<italic>Australopithecus afarensis</italic>
. In addition to a number of isolated specimens, the sample for this species includes two small associated skeletons (A.L. 288-1 or “Lucy” and A.L. 128/129) and a geologically contemporaneous death assemblage of several larger individuals (A.L. 333). These have driven both perceptions and quantitative analyses concluding that
<italic>Au. afarensis</italic>
was markedly dimorphic. The Template Method enables simultaneous evaluation of multiple skeletal sites, thereby greatly expanding sample size, and reveals that
<italic>A. afarensis</italic>
dimorphism was similar to that of modern humans. A new very large partial skeleton (KSD-VP-1/1 or “Kadanuumuu”) can now also be used, like Lucy, as a template specimen. In addition, the recently developed Geometric Mean Method has been used to argue that
<italic>Au. afarensis</italic>
was equally or even more dimorphic than gorillas. However, in its previous application Lucy and A.L. 128/129 accounted for 10 of 11 estimates of female size. Here we directly compare the two methods and demonstrate that including multiple measurements from the same partial skeleton that falls at the margin of the species size range dramatically inflates dimorphism estimates. Prevention of the dominance of a single specimen’s contribution to calculations of multiple dimorphism estimates confirms that
<italic>Au. afarensis</italic>
was only moderately dimorphic.</p>
</abstract>
<kwd-group kwd-group-type="author">
<kwd>Sexual selection</kwd>
<kwd>Reproductive behavior</kwd>
<kwd>Homin</kwd>
<kwd>Human evolution</kwd>
<kwd>Hominid</kwd>
<kwd>Chimpanzee</kwd>
<kwd>Gorilla</kwd>
<kwd>Sexual dimorphism</kwd>
</kwd-group>
<funding-group>
<funding-statement>The authors declare there is no funding for this work.</funding-statement>
</funding-group>
</article-meta>
</front>
</pmc>
</record>

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