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Type: Journal article
Title: Evaluating molecular clock calibrations using Bayesian analyses with soft and hard bounds
Author: Sanders, K.
Lee, M.
Citation: Biology Letters, 2007; 3(3):275-279
Publisher: The Royal Society
Issue Date: 2007
ISSN: 1744-9561
Statement of
Kate L. Sanders and Michael S.Y. Lee
Abstract: A limiting factor in many molecular dating studies is shortage of reliable calibrations. Current methods for choosing calibrations (e.g. cross-validation) treat them as either correct or incorrect, whereas calibrations probably lie on a continuum from highly accurate to very poor. Bayesian relaxed clock analysis permits inclusion of numerous candidate calibrations as priors: provided most calibrations are reliable, the model appropriate and the data informative, the accuracy of each calibration prior can be evaluated. If a calibration is accurate, then the analysis will support the prior so that the posterior estimate reflects the prior; if a calibration is poor, the posterior will be forced away from the prior. We use this approach to test two fossil dates recently proposed as standard calibrations within vertebrates. The proposed bird–crocodile calibration (approx. 247Myr ago) appears to be accurate, but the proposed bird–lizard calibration (approx. 255Myr ago) is substantially too recent.
Keywords: molecular dating; Bayesian analysis; calibration; fossil; reptile
Description: Copyright © Royal Society 2008
RMID: 0020070938
DOI: 10.1098/rsbl.2007.0063
Appears in Collections:Earth and Environmental Sciences publications
Environment Institute publications

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