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Seawater chemistry and biomineralization: did trepostome bryozoans become hypercalcified in the ‘calcite sea’ of the Ordovician?

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Abstract

Secular variations in the proportion of Mg and Ca ions in seawater during the Phanerozoic have driven alternations between calcite seas (Mg:Ca < 2) and aragonite seas (Mg:Ca > 2). There is mounting evidence that these changes in seawater chemistry have impacted the evolution of marine organisms constructing calcareous skeletons, favouring calcite as the CaCO3 biomineral during times of calcite seas but aragonite during times of aragonite seas. It has been suggested that some organisms became hypercalcified when the mineralogy of their skeletons matched seawater type. This paper tests the proposal that calcitic trepostome bryozoans (‘stony bryozoans’) became hypercalcified in the calcite sea of the Ordovician. Data on two independent hypercalcification proxies—the diameter of branches, and exozonal wall thickness—have been compiled from the literature for ramose trepostome species from the Ordovician (calcite sea), Devonian (calcite sea) and Permian (aragonite sea). No significant difference was found in branch diameter between the calcite and aragonite sea periods, whereas wall thickness was found to be greater in the Permian than in the Ordovician and Devonian, counter to expectations. Either these two parameters are inadequate as proxies for hypercalcification or, more likely, trepostomes did not become hypercalcified in the calcite sea of the Early Palaeozoic, probably because they exerted a higher degree of control over their biomineralization than some other groups such as corals.

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Acknowledgements

We are grateful to Dr. Andrej Ernst (Institut für Geowissenschaften, Kiel) and Dr. Abby Smith (University of Otago, Dunedin) for their comments on the manuscript. This study was commenced during a grant provided to PK by the Polish Ministry of Science and Higher Education (N N304 404038).

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Authors and Affiliations

  1. Department of Palaeontology, Natural History Museum, Cromwell Street, London, SW7 5BD, UK

    Paul David Taylor

  2. Institute of Oceanology PAS, ul.Powstancow Warszawy 55, Sopot, 81-712, Poland

    Piotr Kuklinski

  3. Department of Zoology, Natural History Museum, Cromwell Street, London, SW7 5BD, UK

    Piotr Kuklinski

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  1. Paul David Taylor
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Correspondence to Paul David Taylor.

Appendix

Appendix

Table 2 Average branch diameters and exozonal wall thicknesses in Ordovician dendroid trepostome species
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Table 3 Average branch diameters and exozonal wall thicknesses in Devonian dendroid trepostome species
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Table 4 Average branch diameters and exozonal wall thicknesses in Permian dendroid trepostome species
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Taylor, P.D., Kuklinski, P. Seawater chemistry and biomineralization: did trepostome bryozoans become hypercalcified in the ‘calcite sea’ of the Ordovician?. Palaeobio Palaeoenv 91, 185–195 (2011). https://doi.org/10.1007/s12549-011-0054-4

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