Assessing the impact of different carbonate system parameters on benthic foraminifera from controlled growth experiments

M. Mojtahid, P. Depuydt, A. Mouret, S. Le Houedec, S. Fiorini, S. Chollet, F. Massol, F. Dohou, H. L. Filipsson, W. De Boer, G. J. Reichart, C. Barras

Research output: Contribution to journalArticlepeer-review

Abstract

Insights into past marine carbon cycling and water mass properties can be obtained by means of geochemical proxies calibrated through controlled laboratory experiments with accurate seawater carbonate system (C-system) manipulations. Here, we explored the use of strontium/calcium ratio (Sr/Ca) of the calcite shells of benthic foraminifera as a potential seawater C-system proxy through a controlled growth experiment with two deep-sea species (Bulimina marginata and Cassidulina laevigata) and one intertidal species (Ammonia T6). To this aim, we used two experimental set-ups to decouple as much as possible the individual components of the carbonate system, i.e., changing pH at constant dissolved inorganic carbon (DIC) and changing DIC at constant pH. Four climatic chambers were used with different controlled concentrations of atmospheric pCO2 (180 ppm, 410 ppm, 1000 ppm, 1500 ppm). Our results demonstrated that pH did not influence the survival and growth of the three species. However, low DIC conditions (879 μmol kg−1) negatively affected B. marginata and C. laevigata through reduced growth, whereas no effect was observed for Ammonia T6. Our results also showed that Sr/Ca was positively correlated with total Alkalinity (TA), DIC and bicarbonate ion concentration ([HCO3 ]) for Ammonia T6 and B. marginata; i.e., DIC and/or [HCO3 ] were the main controlling factors. For these two species, the regression models were coherent with published data (existing so far only for Ammonia T6) and showed overall similar slopes but different intercepts, implying species-specific effects. Furthermore, the Sr/Ca - C-system relationship was not impacted by ontogenetic trends between chamber stages, which is a considerable advantage for paleo-applications. This applied particularly to Ammonia T6 that calcified many chambers compared to the two other species. However, no correlation with any of the C-system parameters was observed for Sr/Ca in C. laevigata. This might imply either a strong species-specific effect and/or a low tolerance to laboratory conditions leading to a physiological stress, thereby impacting the Sr incorporation into the calcite lattice of C. laevigata.

Original languageEnglish
Article number121396
JournalChemical Geology
Volume623
DOIs
Publication statusPublished - 2023 Apr 20

Bibliographical note

Funding Information:
The study was funded by the CNRS-INSU-LEFE/IMAGO-CYBER program (STING project), the Region Pays de Loire programs (Rising Star project TANDEM) and the Ecotron Ile De France incentive research projects (ECOFOR project). Salary and research support for the PhD student (Second author) were provided by the French Ministry of Higher Education and Research . The authors warmly thank the Ecotron Ile De France team for their extraordinary commitment and for giving us access to laboratory facilities. We acknowledge the support for the Captain and the crew of R/V Skagerak and the staff at Kristineberg Marine Station. We thank A. Elofsson and K. Ljung for help with the fjord sampling. H.L. Filipsson acknowledges support from the Swedish Research Council VR (2017-04190). We thank F. Rihani and S. Quinchard (University of Angers) for their help with foraminifera picking and experimental work, C. La (University of Nantes) for her assistance with LA-ICPMS analyses, Y. Coupeau (IFREMER) for providing us with seawater from the Bay of Biscay, and Nina Keul for providing us the raw data of the publication Keul et al. (2017) . Raw data is available on SEANOE data repository ( https://doi.org/10.17882/89623 ).

Funding Information:
The study was funded by the CNRS-INSU-LEFE/IMAGO-CYBER program (STING project), the Region Pays de Loire programs (Rising Star project TANDEM) and the Ecotron Ile De France incentive research projects (ECOFOR project). Salary and research support for the PhD student (Second author) were provided by the French Ministry of Higher Education and Research. The authors warmly thank the Ecotron Ile De France team for their extraordinary commitment and for giving us access to laboratory facilities. We acknowledge the support for the Captain and the crew of R/V Skagerak and the staff at Kristineberg Marine Station. We thank A. Elofsson and K. Ljung for help with the fjord sampling. H.L. Filipsson acknowledges support from the Swedish Research Council VR (2017-04190). We thank F. Rihani and S. Quinchard (University of Angers) for their help with foraminifera picking and experimental work, C. La (University of Nantes) for her assistance with LA-ICPMS analyses, Y. Coupeau (IFREMER) for providing us with seawater from the Bay of Biscay, and Nina Keul for providing us the raw data of the publication Keul et al. (2017). Raw data is available on SEANOE data repository (https://doi.org/10.17882/89623).

Publisher Copyright:
© 2023 Elsevier B.V.

Subject classification (UKÄ)

  • Environmental Sciences
  • Climate Research
  • Geochemistry

Free keywords

  • Benthic foraminifera
  • Biomineralisation
  • Carbonate system
  • Culture experiment
  • Ocean acidification
  • Sr/ca

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