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dc.contributor.authorJ. Clemente, Christofer
dc.contributor.authorC. Withers, Philip
dc.contributor.authorThompson, Graham
dc.contributor.authorLloyd, David
dc.date.accessioned2017-05-03T15:56:59Z
dc.date.available2017-05-03T15:56:59Z
dc.date.issued2008
dc.date.modified2011-08-24T07:13:51Z
dc.identifier.issn00220949
dc.identifier.urihttp://hdl.handle.net/10072/40255
dc.description.abstractBipedal locomotion by lizards has previously been considered to provide a locomotory advantage. We examined this premise for a group of quadrupedal Australian agamid lizards, which vary in the extent to which they will become bipedal. The percentage of strides that each species ran bipedally, recorded using high speed video cameras, was positively related to body size and the proximity of the body centre of mass to the hip, and negatively related to running endurance. Speed was not higher for bipedal strides, compared with quadrupedal strides, in any of the four species, but acceleration during bipedal strides was significantly higher in three of four species. Furthermore, a distinct threshold between quadrupedal and bipedal strides, was more evident for acceleration than speed, with a threshold in acceleration above which strides became bipedal. We calculated these thresholds using probit analysis, and compared these to the predicted threshold based on the model of Aerts et al. Although there was a general agreement in order, the acceleration thresholds for lizards were often lower than that predicted by the model. We suggest that bipedalism, in Australian agamid lizards, may have evolved as a simple consequence of acceleration, and does not confer any locomotory advantage for increasing speed or endurance. However, both behavioural and threshold data suggest that some lizards actively attempt to run bipedally, implying some unknown advantage to bipedal locomotion.
dc.description.peerreviewedYes
dc.description.publicationstatusYes
dc.languageEnglish
dc.language.isoeng
dc.publisherCompany of Biologists Ltd.
dc.publisher.placeUnited Kingdom
dc.publisher.urihttp://jeb.biologists.org/content/211/13/2058.short
dc.relation.ispartofstudentpublicationN
dc.relation.ispartofpagefrom2058
dc.relation.ispartofpageto2065
dc.relation.ispartofissue13
dc.relation.ispartofjournalJournal of Experimental Biology
dc.relation.ispartofvolume211
dc.rights.retentionY
dc.subject.fieldofresearchBiological Sciences
dc.subject.fieldofresearchMedical and Health Sciences
dc.subject.fieldofresearchcode06
dc.subject.fieldofresearchcode11
dc.titleWhy go bipedal? Locomotion and morphology in Australian agamid lizards
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.rights.copyrightSelf-archiving of the author-manuscript version is not yet supported by this journal. Please refer to the journal link for access to the definitive, published version or contact the author[s] for more information.
gro.date.issued2008
gro.hasfulltextNo Full Text
gro.griffith.authorLloyd, David


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