The concentrations of imidacloprid and nickel that cause 50 percent reduction on offspring release were calculated also regarding each food level, and values are shown in Table S3. The EC50 values for the imidacloprid and nickel exposure increased with the increase of food (just for food levels>3×105). Although this may mean a decrease in toxicity, the values obtained for the standard errors makes us cautious when concluding on changes in toxicity.