Fig. 4. Seat patch water uptake read from the pipette in B. alvarius placed on DI water (A) or NaCl (50 mol l^–1) (B) plotted as a function of seat patch BCF during the same period. In A, 15 trials were performed and in B, only 10 trials as two of the toads often left the chamber within 10–15 min. Each point represents from 8–20 simultaneous measurements ± s.e.m. There was no correlation between BCF and water uptake from either DI or NaCl. Similar results were obtained with B. marinus.