Fig. 3. Sodium content of tissue-gut-cuticle of desiccation-resistant flies (D flies) and the controls (C flies) prior to desiccation (0 h) and at time intervals during desiccation. Values are means ± S.E.M. of five populations from either the C or D treatments. Open bars represent values from the D populations; filled bars represent values from the C populations. Significant differences within each treatment (C or D) are denoted by non-matching letters above the bars.