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Fig. 1. Time course (17 days) of the effects of exposure to brackish water (10{per thousand}, control; white bars) or seawater (30{per thousand}; grey bars) on the rate (µmol day–1 g–1 clam) of ammonia excretion in Polymesoda expansa. Values are means ± S.E.M. (N=5). *Significantly different from the corresponding brackish water value (P<0.05); asignificantly different from the day-3 value (P<0.05); bsignificantly different from the day-6 value (P<0.05); csignificantly different from the day-9 value (P<0.05); dsignificantly different from the day-12 value (P<0.05); esignificantly different from the day-15 value (P<0.05).