Sediment Trap Diagram

A. Depth profile at the sediment trap site. The non-encrusted G. truncatulinoides calcify in the surface mixed layer, the crust is added below the thermocline, and all the dead specimens fall into the sediment trap. Also plotted in red is an average temperature profile. Note: Mg/Ca increases with temperature, shown in red dots on the foraminifera.

B. Scanning electron microscope (SEM) images of non-encrusted G. truncatulinoides (top two panels) and the encrusted form (bottom two panels).

C. Schematic of the entire sediment trap mooring.