Bipedality and hair loss in human evolution revisited: The impact of altitude and activity scheduling

dc.contributorAalto-yliopistofi
dc.contributorAalto Universityen
dc.contributor.authorDavid-Barrett, Tamasen_US
dc.contributor.authorDunbar, Robin I. M.en_US
dc.contributor.departmentDepartment of Computer Scienceen
dc.contributor.organizationUniversity of Oxforden_US
dc.date.accessioned2017-03-28T12:12:48Z
dc.date.available2017-03-28T12:12:48Z
dc.date.issued2016-05en_US
dc.description.abstractBipedality evolved early in hominin evolution, and at some point was associated with hair loss over most of the body. One classic explanation (Wheeler 1984: J. Hum. Evol. 13, 91-98) was that these traits evolved to reduce heat overload when australopiths were foraging in more open tropical habitats where they were exposed to the direct effects of sunlight at midday. A recent critique of this model (Ruxton & Wilkinson 2011a: Proc. Natl. Acad. Sci. USA 108, 20965-20969) argued that it ignored the endogenous costs of heat generated by locomotion, and concluded that only hair loss provided a significant reduction in heat load. We add two crucial corrections to this model (the altitude. at which australopiths actually lived and activity scheduling) and show that when these are included there are substantial reductions in heat load for bipedal locomotion even for furred animals. In addition, we add one further consideration to the model: we extend the analysis across the full 24 h day, and show that fur loss could not have evolved until much later because of the thermoregulatory costs this would have incurred at the altitudes where australopiths actually lived. Fur loss is most likely associated with the exploitation of open habitats at much lower altitudes at a much later date by the genus Homo. (C) 2016 The Authors. Published by Elsevier Ltd.en
dc.description.versionPeer revieweden
dc.format.extent11
dc.format.extent72-82
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationDavid-Barrett, T & Dunbar, R I M 2016, ' Bipedality and hair loss in human evolution revisited : The impact of altitude and activity scheduling ', JOURNAL OF HUMAN EVOLUTION, vol. 94, pp. 72-82 . https://doi.org/10.1016/j.jhevol.2016.02.006en
dc.identifier.doi10.1016/j.jhevol.2016.02.006en_US
dc.identifier.issn0047-2484
dc.identifier.otherPURE UUID: 858f57f2-2a85-44a9-8a4d-a12290e02049en_US
dc.identifier.otherPURE ITEMURL: https://research.aalto.fi/en/publications/858f57f2-2a85-44a9-8a4d-a12290e02049en_US
dc.identifier.otherPURE FILEURL: https://research.aalto.fi/files/11424352/1_s2.0_S0047248416000300_main.pdfen_US
dc.identifier.urihttps://aaltodoc.aalto.fi/handle/123456789/25011
dc.identifier.urnURN:NBN:fi:aalto-201703283250
dc.language.isoenen
dc.relation.ispartofseriesJOURNAL OF HUMAN EVOLUTIONen
dc.relation.ispartofseriesVolume 94en
dc.rightsopenAccessen
dc.subject.keywordAustralopithsen_US
dc.subject.keywordThermoregulationen_US
dc.subject.keywordIncident radiationen_US
dc.subject.keywordAmbient temperatureen_US
dc.subject.keywordActivity patternsen_US
dc.subject.keywordEARLY HOMININSen_US
dc.subject.keywordHOMO-ERECTUSen_US
dc.subject.keywordTHERMOREGULATORY ADVANTAGESen_US
dc.subject.keywordARDIPITHECUS-RAMIDUSen_US
dc.subject.keywordBEHAVIORAL ECOLOGYen_US
dc.subject.keywordMODELING APPROACHen_US
dc.subject.keywordENERGETICSen_US
dc.subject.keywordPLIOCENEen_US
dc.subject.keywordORIGINen_US
dc.subject.keywordFIREen_US
dc.titleBipedality and hair loss in human evolution revisited: The impact of altitude and activity schedulingen
dc.typeA1 Alkuperäisartikkeli tieteellisessä aikakauslehdessäfi
dc.type.versionpublishedVersion
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