Cited by 40Evolution and Paleontology StudiesEvolution and Genetic DynamicsGenomics and Phylogenetic Studies

Molecular Clocks and Explosive Radiations

Bromham, Lindell·2003·Journal of Molecular Evolution

Abstract

Molecular data are ideal for exploring evolutionary history because of its universality, stochasticity, and abundance. These features provide a means of exploring the evolutionary history of all organisms (including those that do not tend to leave fossils), potentially within a statistical framework that allows testing of evolutionary hypotheses. However, the discrepancy between molecular and paleontological dates for three key "explosive" radiations inferred from the fossil record--the Cambrian explosion of animal phyla and the post-KT radiations of modern orders of mammals and birds--have led to a reexamination of the assumptions on which molecular dates are based. Could variation in the rate of molecular evolution, perhaps associated with "explosive" radiations, cause overestimation of diversification dates? Here I examine four hypothetical causes of fast molecular rates in explosive radiations--body size, morphological rate, speciation rate, and ecological diversification--using available empirical evidence on patterns of variation in rate of molecular evolution.

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Crossref · 10.1007/s00239-003-0002-7

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  • Many palaeontologists suggest that the discrepancy between molecular and palaeontological dates shows that molecular clocks can be systematically inaccurate, because some process associated with explosive radiations could speed the molecular clock.

    “Conversely, many palaeontologists suggest that the discrepancy between molecular and palaeontological dates shows that molecular clocks can be systematically inaccurate, because some process associated with explosive radiations could speed the molecular clock 69,70 (although no supporting evidence has yet been found for this hypothesis 49 ).”

    From The modern molecular clock (2003) · cites this paper as [49]

  • Compounding residual and lineage errors are operational errors in measuring the rate of molecular evolution, which include uncertainty in the relationships between taxa, errors in calibration points and uncertainties in the mechanism of evolution.

    “Compounding these residual and lineage errors in the clock are operational errors in measuring the rate of molecular evolution, which include uncertainty in the relationships between taxa (the evolutionary tree), errors in calibration points and uncertainties in the mechanism of evolution 1,49 .”

    From The modern molecular clock (2003) · cites this paper as [49]

  • In some cases, molecular dates produced by different methods contradict each other.

    “In some cases, molecular dates produced by different methods contradict each other 1,48,49 .”

    From The modern molecular clock (2003) · cites this paper as [49]

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Authors
Bromham, L.
Affiliations
University of Sussex (GB)
Corresponding author
Bromham, Lindell
Venue
Journal of Molecular Evolution
Published
2003-08-01
Volume
57
Issue
0
Pages
S13-S20
ISSN
  • 0022-2844 (ISSN-L)
  • 1432-1432
OpenAlex
W2008520170
Cited by
40
References
61
Citations by year
2025: 1 · 2024: 1 · 2020: 2 · 2018: 1 · 2017: 3 · 2016: 2 · 2014: 1 · 2013: 1 · 2012: 2
FWCI
2.89
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Molecular Evolution (publishedVersion)
  • PubMed (publishedVersion)
  • ANU Open Research (Australian National University) (submittedVersion)
Topics
  • Physical Sciences › Earth and Planetary Sciences › Paleontology › Evolution and Paleontology Studies
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Genetics › Evolution and Genetic Dynamics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Genomics and Phylogenetic Studies
Keywords
molecular clock, explosive radiation, Cambrian explosion, Cretaceous-Paleogene boundary, mammal diversification, body size, speciation rates, ecological diversification
MeSH terms
Animals, Birds, Body Constitution, Biological Evolution, Fossils, Mammals, Primates, Radiation, Species Specificity, Time, Evolution, Molecular

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