A: Proline (PROL) content; B: Lipid peroxidation (LPO) levels; C: Protein carbonylation (PC) levels, in clams and mussels exposed to 0 µg/L (CTL, white bars) and 10 µg/L of gadolinium (Gd, colored bars) at different salinity levels (30 and 40). Results are means with standard deviations. For each species, different lowercase letters represent significant differences (p < 0.05) between non‐exposed individuals; for each species, different uppercase letters represent significant differences (p < 0.05) between Gd‐exposed individuals; asterisks represent significant differences (p < 0.05) between Gd‐exposed and non‐exposed treatments.