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Area of Science:

  • Marine Biology
  • Oceanography
  • Biogeochemistry

Background:

  • Planktonic foraminifera are crucial for the oceanic carbon cycle.
  • Their carbonate production influences ocean-atmosphere CO2 exchange and carbon export.
  • Understanding factors affecting their shell characteristics is vital for climate modeling.

Purpose of the Study:

  • To investigate the relationship between planktonic foraminifera shell traits and environmental parameters.
  • To determine the factors influencing variations in foraminifera calcification.
  • To assess the potential of foraminifera shell density as a proxy for seawater density.

Main Methods:

  • Comparison of shell traits from three planktonic foraminifera species.
  • Analysis against a suite of environmental parameters in the central Atlantic.
  • Examination of shell weight variations with habitat depth.

Main Results:

  • Foraminifera calcification is linked to seawater density and species-specific habitat depth.
  • Foraminifera bulk shell densities can serve as a seawater density proxy.
  • Shell weights increase with habitat depth, aiding buoyancy regulation.

Conclusions:

  • Calcification in planktonic foraminifera plays a role in buoyancy regulation.
  • Anthropogenically driven ocean density reduction (oceanic rarefaction) may impact foraminifera.
  • Changes in foraminifera may have significant consequences for the oceanic carbon cycle.