Hydrogen isotope fractionation response to salinity and alkalinity in a calcifying strain of Emiliania huxleyi. (August 2019)

• Record Type: Journal Article
• Authors: Weiss, Gabriella M.; Roepert, Anne; Middelburg, Jack J.; Schouten, Stefan; Sinninghe Damsté, Jaap S.; van der Meer, Marcel T.J.
• Is Part Of: Organic geochemistry. Volume 134(2019)
• Page Start: 62
• Page End: 65
• Publication Date: 2019-08
• Subjects: Hydrogen isotopes -- Alkenones -- Calcification -- Emiliania huxleyi; Organic geochemistry -- Periodicals; Biogeochemistry -- Periodicals; Géochimie organique -- Périodiques; 553.205
• DOI: 10.1016/j.orggeochem.2019.06.001
• Languages: English
• ISSNs: 0146-6380

Abstract

Highlight: No effect of alkalinity for calcifying E. huxleyi . Hydrogen isotope ratios of alkenones more depleted in calcifying E. huxleyi . Similar d 2 HC37 -salinity response in calcifying and non-calcifying haptophytes. Abstract: Hydrogen isotope ratios of long-chain alkenones (δ 2 HC37 ) correlate with water isotope ratios and salinity, albeit with varying degrees of biological fractionation between alkenones and water. These differences in fractionation are the result of environmental and species related effects, which in some cases have consequences for the magnitude of the δ 2 HC37 response per unit increase in salinity. Earlier culture experiments have focused on constraining hydrogen isotope fractionation factor α in non-calcifying strains of Emiliania huxleyi . Here we studied isotopic fractionation in a calcifying strain of E. huxleyi and show that although absolute fractionation is different, the response to changes in salinity and alkalinity is similar to those of non-calcifying species. This suggests that calcification does not alter the δ 2 HC37 response to salinity significantly.