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Trends in element incorporation in hyaline and porcelaneous foraminifera as a function of pCO2
van Dijk, I.; de Nooijer, L.J.; Reichart, G.-J. (2017). Trends in element incorporation in hyaline and porcelaneous foraminifera as a function of pCO2. Biogeosciences 14(3): 497-510. dx.doi.org/10.5194/bg-14-497-2017
In: Gattuso, J.P.; Kesselmeier, J. (Ed.) Biogeosciences. Copernicus Publications: Göttingen. ISSN 1726-4170; e-ISSN 1726-4189, more
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  • van Dijk, I., more
  • de Nooijer, L.J., more
  • Reichart, G.-J., more

Abstract
    In this study we analyzed the impact of seawatercarbonate chemistry on the incorporation of elements in bothhyaline and porcelaneous larger benthic foraminifera.We observeda higher incorporation of Zn and Ba when pCO2 increasesfrom 350 to 1200 ppm. Modeling the activity of freeions as a function of pCO2 shows that speciation of someelements (like Zn and Ba) is mainly influenced by the formationof carbonate complexes in seawater. Hence, differencesin foraminiferal uptake of these might be related primarilyby the speciation of these elements in seawater. Weinvestigated differences in trends in element incorporationbetween hyaline (perforate) and porcelaneous (imperforate)foraminifera in order to unravel processes involved in elementuptake and subsequent foraminiferal calcification. Inhyaline foraminifera we observed a correlation of element incorporationof different elements between species, reflectedby a general higher incorporation of elements in species withhigher Mg content. Between porcelaneous species, interelementdifferences are much smaller. Besides these contrastingtrends in element incorporation, however, similar trendsare observed in element incorporation as a function of seawatercarbonate chemistry in both hyaline and porcelaneousspecies. This suggests similar mechanisms responsible forthe transportation of ions to the site of calcification for thesegroups of foraminifera, although the contribution of theseprocesses might differ across species.

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