Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/62362
Citations
Scopus Web of Science® Altmetric
?
?
Full metadata record
DC FieldValueLanguage
dc.contributor.authorSkinner, A.en
dc.date.issued2010en
dc.identifier.citationSystematic Biology, 2010; 59(6):723-740en
dc.identifier.issn1063-5157en
dc.identifier.issn1076-836Xen
dc.identifier.urihttp://hdl.handle.net/2440/62362-
dc.description.abstractRates of phenotypic evolution derive from numerous interrelated processes acting at varying spatial and temporal scales and frequently differ substantially among lineages. Although current models employed in reconstructing ancestral character states permit independent rates for distinct types of transition (forward and reverse transitions and transitions between different states), these rates are typically assumed to be identical for all branches in a phylogeny. In this paper, I present a general model of character evolution enabling rate heterogeneity among branches. This model is employed in assessing the extent to which the assumption of uniform transition rates affects reconstructions of ancestral limb morphology in the scincid lizard clade Lerista and, accordingly, the potential for rate variability to mislead inferences of evolutionary patterns. Permitting rate variation among branches significantly improves model fit for both the manus and the pes. A constrained model in which the rate of digit acquisition is assumed to be effectively zero is strongly supported in each case; when compared with a model assuming unconstrained transition rates, this model provides a substantially better fit for the manus and a nearly identical fit for the pes. Ancestral states reconstructed assuming the constrained model imply patterns of limb evolution differing significantly from those implied by reconstructions for uniform-rate models, particularly for the pes; whereas ancestral states for the uniform-rate models consistently entail the reacquisition of pedal digits, those for the model incorporating among-lineage rate heterogeneity imply repeated, unreversed digit loss. These results indicate that the assumption of identical transition rates for all branches in a phylogeny may be inappropriate in modeling the evolution of phenotypic traits and emphasize the need for careful evaluation of phylogenetic tests of Dollo's law.en
dc.description.statementofresponsibilityAdam Skinneren
dc.language.isoenen
dc.publisherTaylor & Francis Ltden
dc.rights© The Author(s) 2010. Published by Oxford University Press, on behalf of the Society of Systematic Biologists. All rights reserved.en
dc.subjectCharacter evolution; Dollo's law; likelihood; limb reduction; lizard; model; skinken
dc.titleRate heterogeneity, ancestral character state reconstruction, and the evolution of limb morphology in Lerista (Scincidae, squamata)en
dc.typeJournal articleen
dc.identifier.rmid0020101421en
dc.identifier.doi10.1093/sysbio/syq055en
dc.identifier.pubid32964-
pubs.library.collectionEarth and Environmental Sciences publicationsen
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

Files in This Item:
There are no files associated with this item.


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.