@article{fdi:010089584,
  title = {{I}mpact of seawater sulfate concentration on sulfur concentration and isotopic composition in calcite of two cultured benthic foraminifera},
  author = {{T}haler, {C}. and {P}aris, {G}. and {D}ellinger, {M}. and {D}issard, {D}elphine and {B}erland, {S}. and {M}arie, {A}. and {L}abat, {A}. and {B}artolini, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{M}arine sediments can be used to reconstruct the evolution of seawater [{SO}42-] and delta {S}-34 over time, two key parameters that contribute to refine our understanding of the sulfur cycle and thus of {E}arth's redox state. delta {S}-34 evolution can be measured from carbonates, barites and sulfate evaporites. [{SO}42-] variations can be reconstructed using fluid inclusions in halites, a method that only allows a low-resolution record. {R}econstruction of the past sulfur cycle could be improved if carbonates allowed to track both seawater delta {S}-34 and [{SO}42-] variations in a sole, continuous sedimentary repository. {H}owever, most primary carbonates formed in the ocean are biogenic, and organisms tend to overprint the geochemical signatures of their carbonates through a combination of processes often collectively referred to as vital effects. {H}ence, calibrations are needed to allow seawater delta {S}-34 and [{SO}42-] reconstructions based on biogenic carbonates. {B}ecause foraminifera are important marine calcifyers, we opted to focus on calcite synthesized by individuals of two benthic strains cultured in laboratory under controlled conditions, with varying seawater [{SO}42-] (ranging from 0 m{M} to 180 m{M}). {O}ur experimental design allowed us to obtain foraminiferal asexual reproduction over several generations. {W}e measured bulk carbonate associated sulfate ({CAS}) content and sulfur isotopic composition (delta(34){SCAS}) on samples of tens to hundreds of specimens for each culture medium, where [{SO}42-] varied from 5 to 60 m{M}. {I}ncreasing or decreasing [{SO}42-] with respect to modern-day seawater concentration (28 m{M}) impacted foraminiferal population size dynamics and the total amount of bioprecipitated carbonate. {F}oraminiferal {CAS} concentration increased proportionally with [{SO}42-] concentration from 5 m{M} up to a threshold value of 40 m{M}, highlighting the extent of control on the precipitation fluid chemistry that foraminifera exert on the carbonate precipitation loci. {Y}et, despite the significant effect of [{SO}42-] on foraminiferal physiology and on {CAS} incorporation, the isotopic fractionation between {CAS} and seawater remains stable through varying seawater [{SO}42-]. {A}ltogether, these results illustrate that {CAS} in biogenic calcite could constitute a good proxy for both seawater [{SO}42-] and delta {S}-34 and contributes to emphasize the role played by sulfate on foraminiferal biomineralization and biological activity.},
  keywords = {{FRANCE} ; {MEDITERRANEE} ; {ATLANTIQUE}},
  booktitle = {},
  journal = {{B}iogeosciences},
  volume = {20},
  numero = {24},
  pages = {5177--5198},
  ISSN = {1726-4170},
  year = {2023},
  DOI = {10.5194/bg-20-5177-2023},
  URL = {https://www.documentation.ird.fr/hor/fdi:010089584},
}