IMIS | Flanders Marine Institute
 

Flanders Marine Institute

Platform for marine research

IMIS

Publications | Institutes | Persons | Datasets | Projects | Maps
[ report an error in this record ]basket (0): add | show Print this page

Mn incorporation in large benthic foraminifera: differences between species and the impact of pCO2
van Dijk, I.; de Nooijer, L.J.; Barras, C.; Reichart, G.-J. (2020). Mn incorporation in large benthic foraminifera: differences between species and the impact of pCO2. Front. Earth Sci. 8: 567701. https://doi.org/10.3389/feart.2020.567701

Additional info:
In: Frontiers in Earth Science. Frontiers Media: Lausanne. ISSN 2296-6463, more
Peer reviewed article  

Available in  Authors 
    NIOZ: NIOZ Open Repository 355125

Author keywords
    foraminifera; manganese; carbon chemistry; pCO2; proxy development

Authors  Top 
  • van Dijk, I., more
  • de Nooijer, L.J., more
  • Barras, C.
  • Reichart, G.-J., more

Abstract
    Element concentrations of calcite precipitated by foraminifera reflect chemical and physical properties of seawater and can therefore be used to reconstruct (paleo-)environmental conditions. Foraminiferal carbonate associated manganese incorporation (expressed here as Mn/Ca) is a potential proxy for seawater oxygenation, although the impacts of other environmental parameters need to be quantified before Mn/Ca can be robustly applied. Here we report the isolated impact of seawater carbonate chemistry on manganese incorporation in the shells of two large symbiont-bearing benthic foraminiferal species. Moreover, we investigated the role of biomineralization on manganese incorporation by using species withcontrasting calcification pathways: the hyaline speciesAmphistegina gibbosa and the porcelaneous species Sorites marginalis. Furthermore, analyzing shells from a wide range of species grown under identical conditions allowed assessment of species-specific Mn incorporation in other foraminiferal species. Our observations show that species specific differences in biomineralization strategies are the dominant factor determining Mn content. Shells from porcelaneous species, with relatively high Mg contents, are generally also enriched in Mn compared to low-Mg/Ca foraminifera. Superimposed on the effect of biomineralization, chemical speciation of elements in seawater as a function of pCO2 also affects their incorporation. Whereas the impact of the carbonate system is limited, the inter-specific differences call for species specific calibrations in order to use Mn uptake as a (paleo-)oxygenation proxy.

All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy Top | Authors