Journal ArticleDOI
Establishing a time-scale for plant evolution
TLDR
A post-Jurassic origin of angiosperms and a post-Cambrian origin of land plants are rejected, and it is suggested that the establishment of the major embryophyte lineages occurred at a much slower tempo than suggested in most previous studies.Abstract:
• Plants have utterly transformed the planet, but testing hypotheses of causality requires a reliable time-scale for plant evolution. While clock methods have been extensively developed, less attention has been paid to the correct interpretation and appropriate implementation of fossil data. • We constructed 17 calibrations, consisting of minimum constraints and soft maximum constraints, for divergences between model representatives of the major land plant lineages. Using a data set of seven plastid genes, we performed a cross-validation analysis to determine the consistency of the calibrations. Six molecular clock analyses were then conducted, one with the original calibrations, and others exploring the impact on divergence estimates of changing maxima at basal nodes, and prior probability densities within calibrations. • Cross-validation highlighted Tracheophyta and Euphyllophyta calibrations as inconsistent, either because their soft maxima were overly conservative or because of undetected rate variation. Molecular clock analyses yielded estimates ranging from 568-815 million yr before present (Ma) for crown embryophytes and from 175-240 Ma for crown angiosperms. • We reject both a post-Jurassic origin of angiosperms and a post-Cambrian origin of land plants. Our analyses also suggest that the establishment of the major embryophyte lineages occurred at a much slower tempo than suggested in most previous studies. These conclusions are entirely compatible with current palaeobotanical data, although not necessarily with their interpretation by palaeobotanists.read more
Citations
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Journal ArticleDOI
A metacalibrated time-tree documents the early rise of flowering plant phylogenetic diversity
TL;DR: This time-frame documents an early phylogenetic proliferation that led to the establishment of major angiosperm lineages, and the origin of over half of extant families, in the Cretaceous.
Journal Article
Accounting for calibration uncertainty in phylogenetic estimation of evolutionary divergence times
TL;DR: A variety of local and relaxed clock methods have been proposed and implemented for phylogenetic divergence dating as discussed by the authors, which allows different molecular clocks in different parts of the phylogenetic tree, thereby retaining the advantages of the classical molecular clock while casting off the restrictive assumption of a single, global rate of substitution.
Journal ArticleDOI
Best practices for justifying fossil calibrations
James F. Parham,James F. Parham,James F. Parham,Philip C. J. Donoghue,Christopher J. Bell,Tyler Calway,Jason J. Head,Patricia A. Holroyd,Jun G. Inoue,Randall B. Irmis,Walter G. Joyce,Daniel T. Ksepka,Daniel T. Ksepka,José S. L. Patané,Nathan D. Smith,Nathan D. Smith,James E. Tarver,James E. Tarver,Marcel van Tuinen,Ziheng Yang,Kenneth D. Angielczyk,Jenny M. Greenwood,Christy A. Hipsley,Christy A. Hipsley,Louis L. Jacobs,Peter J. Makovicky,Johannes Müller,Krister T. Smith,Jessica M. Theodor,Rachel C. M. Warnock,Michael J. Benton +30 more
TL;DR: A specimen-based protocol for selecting and documenting relevant fossils is presented and future directions for evaluating and utilizing phylogenetic and temporal data from the fossil record are discussed, to establish the best practices for justifying fossils used for the temporal calibration of molecular phylogenies.
Journal ArticleDOI
The timescale of early land plant evolution
Jennifer L. Morris,Mark N. Puttick,James W. Clark,Dianne Edwards,Paul Kenrick,Silvia Pressel,Charles H. Wellman,Ziheng Yang,Ziheng Yang,Harald Schneider,Philip C. J. Donoghue +10 more
TL;DR: A timescale for early land plant evolution that integrates over topological uncertainty by exploring the impact of competing hypotheses on bryophyte−tracheophyte relationships, among other variables, on divergence time estimation is established.
Journal ArticleDOI
Estimating divergence times in large molecular phylogenies
Koichiro Tamura,Fabia U. Battistuzzi,Fabia U. Battistuzzi,Paul Billing-Ross,Oscar Murillo,Alan Filipski,Sudhir Kumar +6 more
TL;DR: RelTime is presented, a method that estimates relative times of divergences for all branching points (nodes) in very large phylogenetic trees without assuming a specific model for lineage rate variation or specifying any clock calibrations.
References
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Journal ArticleDOI
Assessing concordance of fossil calibration points in molecular clock studies: an example using turtles.
TL;DR: A new cross‐validation method is presented that identifies inconsistent fossils when multiple fossil calibrations are available for a clade and it is found that despite their overall antiquity as a lineage, the most species‐rich clades of turtles diversified well within the Cenozoic.
Journal ArticleDOI
Rate heterogeneity among lineages of tracheophytes: Integration of molecular and fossil data and evidence for molecular living fossils
TL;DR: This study minimize the potential error caused by inaccurate topology and uncertain calibration times by using a well-supported tree, multiple genes, and multiple well-substantiated dates to explore the correspondence between the fossil record and molecular-based age estimates for major clades of tracheophytes.
Journal ArticleDOI
Timing of the Early Triassic carbon cycle perturbations inferred from new U–Pb ages and ammonoid biochronozones.
Thomas Galfetti,Hugo Bucher,Maria Ovtcharova,Urs Schaltegger,Arnaud Brayard,Thomas Brühwiler,Nicolas Goudemand,Helmut Weissert,Peter A. Hochuli,Fabrice Cordey,Kuang Guodun +10 more
TL;DR: Based on analyses of single, thermally annealed and chemically abraded zircons, a new high-precision U-Pb age of 251.22± 0.20 Ma is established for a volcanic ash layer within the “Kashmirites densistriatus beds” of early Smithian age (Early Triassic) from the Luolou Formation (northwestern Guangxi, South China) as discussed by the authors.
Journal ArticleDOI
The Impact of the Representation of Fossil Calibrations on Bayesian Estimation of Species Divergence Times
TL;DR: The results highlight the critical importance of fossil calibrations to molecular dating and the need for probabilistic modeling of fossil depositions, preservations, and sampling to provide statistical summaries of information in the fossil record concerning species divergence times.
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