Cadmium concentration (g/g dry weight) in digestive gland of mussels, Mytilus galloprovincialis, under different experimental conditions. Results are expressed as mean ± SD. Horizontal segments indicate significant differences (p < 0.05) between paired means according to Mann Whitney’s U test. 18 ◦C, mussels at 18 ◦C and non exposed to Cd; 18 ◦C + Cd, mussels at 18 ◦C and Cd exposed; 26 ◦C, mussels at 26 ◦C and non exposed to Cd; 26 ◦C + Cd, mussels at 26 ◦C and Cd exposed.