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The fossil record and estimating divergence times between lineages: maximum divergence times and the importance of reliable phylogenies.
J Mol Evol. 1990 May; 30(5):400-8.JM

Abstract

Bounded estimates on divergence times between lineages are crucial to the calculation of absolute rates of molecular evolution. Upper (minimum) bounds on divergence times are easily estimated based on earliest fossil finds. Lower (maximum) bounds are more difficult to estimate; the age of putative ancestors may be used, though in practice it is virtually impossible to distinguish ancestors from primitive sister groups, which do not, of logical necessity, constitute lower bounds on divergence times. Two relatively new approaches to estimating lower bounds directly assess the incompleteness of the fossil record. The first uses taphonomic control groups to distinguish real absences from nonpreservation, while the second, and probably more powerful, uses the quality of the fossil record to estimate confidence intervals on the bases of stratigraphic ranges. For some groups, especially vertebrates, the inclusion or exclusion of problematic fossils can dramatically affect estimated lower bounds on divergence times, often swamping the uncertainties due to the incompleteness of the fossil record and/or correlation and dating errors. When datable paleogeographic events reflect ancient divisions of faunas, a lower bound on the divergence time of species within a fauna can be established based on the geologic, rather than fossil, record. The fossil records of hominids, eutherian mammals, echinoids, and geese are used as examples.

Authors+Show Affiliations

Department of Molecular Genetics, University of Chicago, Illinois 60637.

Pub Type(s)

Journal Article
Review

Language

eng

PubMed ID

2111853

Citation

Marshall, C R.. "The Fossil Record and Estimating Divergence Times Between Lineages: Maximum Divergence Times and the Importance of Reliable Phylogenies." Journal of Molecular Evolution, vol. 30, no. 5, 1990, pp. 400-8.
Marshall CR. The fossil record and estimating divergence times between lineages: maximum divergence times and the importance of reliable phylogenies. J Mol Evol. 1990;30(5):400-8.
Marshall, C. R. (1990). The fossil record and estimating divergence times between lineages: maximum divergence times and the importance of reliable phylogenies. Journal of Molecular Evolution, 30(5), 400-8.
Marshall CR. The Fossil Record and Estimating Divergence Times Between Lineages: Maximum Divergence Times and the Importance of Reliable Phylogenies. J Mol Evol. 1990;30(5):400-8. PubMed PMID: 2111853.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The fossil record and estimating divergence times between lineages: maximum divergence times and the importance of reliable phylogenies. A1 - Marshall,C R, PY - 1990/5/1/pubmed PY - 1990/5/1/medline PY - 1990/5/1/entrez SP - 400 EP - 8 JF - Journal of molecular evolution JO - J Mol Evol VL - 30 IS - 5 N2 - Bounded estimates on divergence times between lineages are crucial to the calculation of absolute rates of molecular evolution. Upper (minimum) bounds on divergence times are easily estimated based on earliest fossil finds. Lower (maximum) bounds are more difficult to estimate; the age of putative ancestors may be used, though in practice it is virtually impossible to distinguish ancestors from primitive sister groups, which do not, of logical necessity, constitute lower bounds on divergence times. Two relatively new approaches to estimating lower bounds directly assess the incompleteness of the fossil record. The first uses taphonomic control groups to distinguish real absences from nonpreservation, while the second, and probably more powerful, uses the quality of the fossil record to estimate confidence intervals on the bases of stratigraphic ranges. For some groups, especially vertebrates, the inclusion or exclusion of problematic fossils can dramatically affect estimated lower bounds on divergence times, often swamping the uncertainties due to the incompleteness of the fossil record and/or correlation and dating errors. When datable paleogeographic events reflect ancient divisions of faunas, a lower bound on the divergence time of species within a fauna can be established based on the geologic, rather than fossil, record. The fossil records of hominids, eutherian mammals, echinoids, and geese are used as examples. SN - 0022-2844 UR - https://www.unboundmedicine.com/medline/citation/2111853/The_fossil_record_and_estimating_divergence_times_between_lineages:_maximum_divergence_times_and_the_importance_of_reliable_phylogenies_ DB - PRIME DP - Unbound Medicine ER -
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