Abstract
Strongly controlled calcification by bryozoans means that some species maintain complex skeletons formed of more than one mineral. Whether they are mainly intermediate-Mg calcitic with up to 50% aragonite, mainly aragonitic with small amounts of high-Mg calcite (>8 wt.% MgCO3), or formed of both high- and low-Mg calcites, preservation of sediments formed of these bimineralic bryozoan skeletons may be more at risk from ocean acidification than the majority of bryozoan sediments formed of monomineralic skeletons. An acid-bath immersion experiment on seven species reveals that three (Adeonella sp., Adeonella patagonica, and Adeonellopsis sp.) are more resistant to dissolution than the other four. Skeletal carbonate mineralogy appears to influence dissolution history very little: the most soluble aragonite and high-Mg calcite species, Adeonellopsis sp., was more highly resistant to dissolution than species dominated by low-Mg calcite. In the context of ocean acidification, it is likely that bryozoan skeletons with high surface area and small delicate morphologies are at greatest risk of dissolution, irrespective of mineralogical composition.
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Acknowledgements
We thank Albert Zhou and Bev Dickson of the Portobello Marine Laboratory for assistance with laboratory work; Liz Girvan of the Otago Centre for Electron Microscopy for assistance with SEM photomicrography; Damian Walls of the Geology Department, University of Otago for support of XRD work. Sediment samples were mainly collected by the University of Otago’s Research Vessel Polaris II, and we thank Bill Dickson and Phil Heseltine for their ongoing help in the field. This work was funded by the University of Otago Research Grant. We thank Prof. Marcus M. Key, Jr. and Prof. Priska Schäfer for their helpful reviews.
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Smith, A.M., Garden, C.J. (2013). Being a Bimineralic Bryozoan in an Acidifying Ocean. In: Ernst, A., Schäfer, P., Scholz, J. (eds) Bryozoan Studies 2010. Lecture Notes in Earth System Sciences, vol 143. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-16411-8_22
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DOI: https://doi.org/10.1007/978-3-642-16411-8_22
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