EGU24-16323, updated on 09 Mar 2024
https://doi.org/10.5194/egusphere-egu24-16323
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Temperature Influence on Proton Pumping and Mg-Incorporation in Foraminifera

Daniel Francois Do Nascimento Silva1, Lennart de Nooijer2, and Gert-Jan Reichart3
Daniel Francois Do Nascimento Silva et al.
  • 1NIOZ - Royal Netherlands Institute for Sea Research, Department of Ocean Systems, Den Hoorn, The Netherlands (danielfrancois@id.uff.br)
  • 2NIOZ - Royal Netherlands Institute for Sea Research, Department of Ocean Systems, Den Hoorn, The Netherlands (lennart.de.nooijer@nioz.nl)
  • 3Utrecht University, Department of Earth Sciences, Utrecht, The Netherlands (gert-jan.reichart@nioz.nl)

The Mg/Ca ratio in foraminiferal shells is commonly used as a proxy for reconstructing sea surface and bottom water temperatures. However, its incorporation results from complex interactions between seawater conditions and biologically regulated factors. While the former effects are well-constrained, poorly understood biological factors contribute to interspecies variations in Mg/Ca-temperature calibrations and a notable difference in Mg sensitivity compared to inorganically precipitated calcium carbonates. Here we show that temperature significantly influences cellular ion modulation in low-Mg species, leading to elevated enzymatic reaction rates that enhance H+ removal (J = 0.67 to 5.00 nmol-s) during calcification, and boost the precipitation rate. On high-Mg species, on the other hand, a similar fivefold increase in H+ local flux was observed (J = 0.08 to 0.40 nmol-s), but its impact on the calcification rate was mild. In both cases, H+ pumping rates align with Mg uptake, indicating a potential (indirect) link between temperature-sensitive behavior of transporters and Mg partitioning.

How to cite: Do Nascimento Silva, D. F., de Nooijer, L., and Reichart, G.-J.: Temperature Influence on Proton Pumping and Mg-Incorporation in Foraminifera, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-16323, https://doi.org/10.5194/egusphere-egu24-16323, 2024.