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Biogeographic calibrations for the molecular clock.

Simon Y W Ho1, K Jun Tong2, Charles S P Foster2

  • 1School of Biological Sciences, University of Sydney, Sydney, NSW 2006, Australia simon.ho@sydney.edu.au.

Biology Letters
|September 4, 2015
PubMed
Summary

Biogeographic calibrations, using geological and climatic data, offer alternative methods for molecular clock dating. However, their reliability varies due to underlying assumptions, requiring careful consideration in evolutionary timescale estimations.

Keywords:
Bayesian phylogeneticsbiogeographycalibrationdivergence datingmolecular clock

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Area of Science:

  • Evolutionary Biology
  • Paleontology
  • Molecular Evolution

Background:

  • Molecular clock methods are crucial for estimating evolutionary timescales.
  • Existing methods often rely on fossil calibrations.
  • Rate variation across lineages can be accommodated by advanced molecular clock models.

Purpose of the Study:

  • To review the nature and assumptions of biogeographic calibrations for molecular clocks.
  • To explore geological and climatic data as sources for molecular clock calibration.
  • To explain the incorporation of biogeographic calibration data into dating analyses.

Main Methods:

  • Review of existing literature on molecular clock calibration techniques.
  • Analysis of assumptions inherent in using geological and climatic data for calibration.
  • Description of methods for integrating biogeographic calibration information into phylogenetic dating.

Main Results:

  • Biogeographic data (geological and climatic) can serve as valuable calibrations for molecular clocks.
  • The application of biogeographic calibrations involves significant assumptions, impacting their precision and reliability.
  • A range of geological and climatic events can provide informative calibration points.

Conclusions:

  • Biogeographic calibrations offer a complementary approach to fossil calibrations in molecular dating.
  • Understanding and critically evaluating the assumptions of biogeographic calibrations is essential for accurate evolutionary timescale estimates.
  • Further methodological development is needed to enhance the reliability and precision of biogeographic calibrations.