Abstract
Arising from: D. A. Fike et al. Nature 444, 744–747 (2006)10.1038/nature05345; Fike et al. reply
The link between the radiation of various lineages of eukaryotes in the latest Proterozoic and massive environmental changes—oxygenation, global ice ages and bolide impact—is the focus of much research interest. Fike et al.1 use carbon and sulphur isotope–chemostratigraphic data from Oman to propose three stages of oxidation in the Ediacaran oceans, and link the second and third stages to eukaryote diversification. The second stage, signalled by strongly 13C-depleted sedimentary carbonates (the ‘Shuram excursion’), is believed to result from oxidation of a large, deep-ocean reservoir of organic carbon1. Fike et al. use our data2,3 to assert that a correlative carbon isotope excursion in Australia coincided with the initial diversification of acanthomorphic acritarchs. Peak diversity is claimed to have coincided with subsequent deposition of 13C-enriched carbonate and the third oxidation stage. However, the authors seem to have misinterpreted our data, which instead indicate that diversification significantly preceded the Shuram excursion; this weakens their argument for a link between the inferred oxidation events and eukaryote evolution.
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References
Fike, D. A., Grotzinger, J. P., Pratt, L. M. & Summons, R. E. Oxidation of the Ediacaran Ocean. Nature 444, 744–747 (2006)
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Calver, C. R. & Lindsay, J. F. Ediacarian sequence and isotope stratigraphy of the Officer Basin, South Australia. Aust. J. Earth Sci. 45, 513–532 (1998)
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Grey, K., Calver, C. Ediacaran oxidation and biotic evolution. Nature 450, E17 (2007). https://doi.org/10.1038/nature06360
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DOI: https://doi.org/10.1038/nature06360
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