Please use this identifier to cite or link to this item: http://hdl.handle.net/2440/120824
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dc.contributor.authorThornhill, A.en
dc.contributor.authorCrisp, M.en
dc.contributor.authorKülheim, C.en
dc.contributor.authorLam, K.en
dc.contributor.authorNelson, L.en
dc.contributor.authorYeates, D.en
dc.contributor.authorMiller, J.en
dc.date.issued2019en
dc.identifier.citationAustralian Systematic Botany, 2019; 32(1):29-48en
dc.identifier.issn1030-1887en
dc.identifier.issn1446-5701en
dc.identifier.urihttp://hdl.handle.net/2440/120824-
dc.description.abstractThe eucalypts, which include Eucalyptus, Angophora and Corymbia, are native to Australia and Malesia and include over 800 named species in a mixture of diverse and depauperate lineages. We assessed the fit of the eucalypt taxonomic classification to a phylogeny of 711 species scored for DNA sequences of plastid matK and psbA–trnH, as well as nuclear internal transcribed spacer and external transcribed spacer. Two broadly similar topologies emerge from both maximum likelihood and Bayesian analyses, showing Angophora nested within Corymbia, or Angophora sister to Corymbia. The position of certain species-poor groups on long branches fluctuated relative to the three major Eucalyptus subgenera, and positions of several closely related species within those subgenera were unstable and lacked statistical support. Most sections and series of Eucalyptus were not recovered as monophyletic. We calibrated these phylogenies against time, using penalised likelihood and constraints obtained from fossil ages. On the basis of these trees, most major eucalypt subgenera arose in the Late Eocene and Early Oligocene. All Eucalyptus clades with taxa occurring in south-eastern Australia have crown ages <20 million years. Several eucalypt clades display a strong present-day geographic disjunction, although these clades did not have strong phylogenetic statistical support. In particular, the estimated age of the separation between the eudesmids (Eucalyptus subgenus Eudesmia) and monocalypts (Eucalyptus subgenus Eucalyptus) was consistent with extensive inland water bodies in the Eocene. Bayesian analysis of macroevolutionary mixture rates of net species diversification accelerated in five sections of Eucalyptus subgenus Symphyomyrtus, all beginning 2–3 million years ago and associated with semi-arid habitats dominated by mallee and mallet growth forms, and with open woodlands and forests in eastern Australia. This is the first time that a calibrated molecular study has shown support for the rapid diversification of eucalypts in the recent past, most likely driven by changing climate and diverse soil geochemical conditions.en
dc.description.statementofresponsibilityAndrew H. Thornhill, Michael D. Crisp D, Carsten Külheim D E, Kristy E. Lam A, Leigh A. Nelson F, David K. Yeates F and Joseph T. Milleren
dc.language.isoenen
dc.publisherCSIRO Publishingen
dc.rightsJournal compilation © CSIRO 2019en
dc.subjectBayesian analysis of macroevolutionary mixtures (BAMM); eucalypts; molecular dating; Myrtaceae; phylogeneticsen
dc.titleA dated molecular perspective of eucalypt taxonomy, evolution and diversificationen
dc.typeJournal articleen
dc.identifier.rmid0030132930en
dc.identifier.doi10.1071/SB18015en
dc.relation.granthttp://purl.org/au-research/grants/arc/DP130101141en
dc.identifier.pubid492917-
pubs.library.collectionEnvironment Institute publicationsen
pubs.library.teamDS10en
pubs.verification-statusVerifieden
pubs.publication-statusPublisheden
dc.identifier.orcidThornhill, A. [0000-0002-0325-5725]en
Appears in Collections:Environment Institute publications

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