Incorporation of Mg and Sr in calcite of cultured benthic foraminifera (Heterostegina depressa and Ammonia tepida) and seawater carbonate chemistry, 2010 ...

• Main Authors: Raitzsch, Markus, Dueñas-Bohórquez, Adriana, Reichart, Gert-Jan, de Nooijer, Lennart Jan, Bickert, Torsten
• Format: Dataset
• Language: English
• Published: PANGAEA 2010
• Subjects: Ammonia tepida; Benthos; Biomass/Abundance/Elemental composition; Bottles or small containers/Aquaria <20 L; Chromista; Foraminifera; Heterostegina depressa; Heterotrophic prokaryotes; Laboratory experiment; Laboratory strains; North Atlantic; Single species; Experimental treatment; Identification; Salinity; Temperature, water; Alkalinity, total; Alkalinity, total, standard deviation; Carbon, inorganic, dissolved; Carbon, inorganic, dissolved, standard deviation; Calcium; Calcium, standard deviation; Carbon dioxide; Carbon dioxide, standard deviation; Calcite saturation state; Calcite saturation state, standard deviation; Carbonate system computation flag; pH; Partial pressure of carbon dioxide water at sea surface temperature wet air; Fugacity of carbon dioxide water at sea surface temperature wet air; Bicarbonate ion; Carbonate ion; Aragonite saturation state; Magnesium/Calcium ratio; Magnesium/Calcium ratio, standard deviation; Strontium/Calcium ratio; Strontium/Calcium ratio, standard deviation; Heterostegina depressa, magnesium/calcium ratio; Heterostegina depressa, magnesium/calcium ratio, standard deviation; Ammonia tepida, magnesium/calcium ratio; Ammonia tepida, magnesium/calcium ratio, standard deviation; Heterostegina depressa, incorporation, magnesium; Heterostegina depressa, incorporation, magnesium, standard deviation; Ammonia tepida, incorporation, magnesium; Ammonia tepida, incorporation, magnesium, standard deviation; Heterostegina depressa, strontium/calcium ratio; Heterostegina depressa, strontium/calcium ratio, standard deviation; Ammonia tepida, strontium/calcium ratio; Ocean acidification
• Online Access: https://dx.doi.org/10.1594/pangaea.758073; https://doi.pangaea.de/10.1594/PANGAEA.758073

We investigated the effect of the calcium concentration in seawater and thereby the calcite saturation state (omega) on the magnesium and strontium incorporation into benthic foraminiferal calcite under laboratory conditions. For this purpose individuals of the shallow-water species Heterostegina depressa (precipitating high-Mg calcite, symbiont-bearing) and Ammonia tepida (low-Mg calcite, symbiont-barren) were cultured in media under a range of [Ca2+], but similar Mg/Ca ratios. Trace element/Ca ratios of newly formed calcite were analysed with Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS) and normalized to the seawater elemental composition using the equation DTE=(TE/Cacalcite)/(TE/Caseawater). The culturing study shows that DMg of A. tepida significantly decreases with increasing omega at a gradient of -4.3x10-5 per omega unit. The DSr value of A. tepida does not change with omega, suggesting that fossil Sr/Ca in this species may be a potential tool to reconstruct past variations ... : In order to allow full comparability with other ocean acidification data sets, the R package seacarb (Lavigne and Gattuso, 2011) was used to compute a complete and consistent set of carbonate system variables, as described by Nisumaa et al. (2010). In this dataset the original values were archived in addition with the recalculated parameters (see related PI). ...