[1] In order to assess the dissolution effect on foraminiferal Mg/Ca ratios, we analyzed Mg/Ca of seven planktonic foraminiferal species and four of their varieties from Caribbean core tops from $900-4700 m water depth. Depending on the foraminiferal species and variety, Mg/Ca start to decline linearly below ], similar to decreases of $0.5-0.8 mmol/mol per kilometer below $2500-3000 m water depth. Above these speciesspecific critical levels, Mg/Ca remains stable with higher intraspecific Mg/Ca variability than below. We developed routines to correct Mg/Ca from below these critical thresholds for dissolution effects, which reduce the overall intraspecific variability by $24-64%, and provide dissolution-corrected Mg/Ca appropriate to calculate Holocene paleotemperatures. When taking into account only dissolutionunaffected Mg/Ca from <2000 m, the systematic succession of foraminiferal species according to their Mg/ Ca reflects expected calcification depths.

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