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Biogeosciences An interactive open-access journal of the European Geosciences Union
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Volume 12, issue 7
Biogeosciences, 12, 2153–2162, 2015
https://doi.org/10.5194/bg-12-2153-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Biogeosciences, 12, 2153–2162, 2015
https://doi.org/10.5194/bg-12-2153-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Research article 10 Apr 2015

Research article | 10 Apr 2015

Impact of seawater [Ca2+] on the calcification and calciteMg / Ca of Amphistegina lessonii

A. Mewes et al.

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Revised manuscript accepted for BG
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Cited articles

Bentov, S. and Erez, J.: Impact of biomineralization processes on the Mg content of foraminiferal shells: A biological perspective, Geochem. Geophys. Geosy., 7, 1–11, 2006.
Bentov, S., Brownlee, C. and Erez, J.: The role of seawater endocytosis in the biomineralization process in calcareous foraminifera, P. Natl. Acad. Sci., 106, 21500–21504, 2009.
Branson, O., Redfern, S. A., Tyliszczak, T., Sadekov, A., Langer, G., Kimoto, K., and Elderfield, H.: The coordination of Mg in foraminiferal calcite, Earth Planet. Sci. Lett., 383, 134–141, 2013.
Broecker, W. and Yu, J.: What do we know about the evolution of Mg to Ca ratios in seawater?, Paleoceanography 26, PA3203, https://doi.org/10.1029/2011PA002120, 2006.
de Nooijer, L. J., Langer, G., Nehrke, G., and Bijma, J.: Physiological controls on seawater uptake and calcification in the benthic foraminifer Ammonia tepida, Biogeosciences, 6, 2669–2675, https://doi.org/10.5194/bg-6-2669-2009, 2009.
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A culture study with the benthic foraminifer Amphistegina lessonii was conducted at varying seawater [Ca2+] and constant [Mg2+]. Results showed optimum growth rates and test thickness at ambient seawater Mg/Ca and a calcite Mg/Ca which is controlled by the relative seawater ratio. Results support the conceptual biomineralization model by Nehrke et al. (2013); however, our refined flux-based model suggests transmembrane transport fractionation that is slightly weaker than expected.
A culture study with the benthic foraminifer Amphistegina lessonii was conducted at varying...
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