Figure 7.1. Shell concentrations in the sediments vs. mean annual chlorophyll a at 10 m (chlorophyll data from Conkright et al. 1998a, b, c).  7.2. Shell concentrations in the sediments vs. mean annual Si concentration at the surface (10 m) (Si data from García et al. 2006).  7.3. Shell concentrations in the sediments vs. mean annual Si concentration at depth (1500 m) (Si data from García et al. 2006).