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Precambrian Surface Temperatures and Molecular Phylogeny

Published online by Cambridge University Press:  19 September 2017

David Schwartzman  and
Charles H. Lineweaver
David Schwartzman
Affiliation:
Department of Biology Howard University, Washington, DC 20059, U.S.A, [email protected]
Charles H. Lineweaver
Affiliation:
Department of Astrophysics and Optics, University of New South Wales, Australian Centre for Astrobiology, Sydney, 2052 Australia, [email protected]

Abstract

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The timing of emergence of major organismal groups is consistent with the climatic temperature being equal to their upper temperature limit of growth (Tmax), implying a temperature constraint on the evolution of each group, with the climatic temperature inferred from the oxygen isotope record of marine cherts. Support for this constraint comes from the correlation of Tmax with the rRNA molecular phylogenetic distance from the last common ancestor (LCA) for both thermophilic Archaea and Bacteria. In particular, this correlation for hyperthermophilic Archaea suggests a climatic temperature of about 120°C at the time of the LCA, likely in the Hadean.

Type
Archaea
Information
Symposium - International Astronomical Union , Volume 213: Bioastronomy 2002: Life Among the stars , 2004 , pp. 355 - 358
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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