Fig. 5. Rates of water uptake in B. alvarius (A) or B. marinus (B) immersed in 1.5 mm, 6 mm or fully immersed in DI water or NaCl (50 mol l^–1). Each column represents mean ± 1 s.e.m. for 15 trials. Water uptake from DI was not different irrespective of immersion level. In NaCl, increased immersion resulted in significantly increased rates of water uptake. **P<0.01; ***P<0.001.