Abstract
This chapter discusses the effects of environmental pH on sodium and chloride influx in an inhabitant of acid waters. The distribution pattern could indicate that Corixa punctata tolerates extreme ranges of H concentrations because of physiological adaptations. The insufficiency in NaCl regulation that has been observed in acid-stressed fish is widely accepted as explanation for the high mortality rate at low pH. Therefore, the effect of pH on the Na and Cl influx over a wide range of external Na and Cl concentrations has been studied in these species. The relationship between the influx and the external concentration appear to follow Michaelis–Menten kinetics. The typical form of influx relationship seems to be independent of the pH except for the Cl-influx at pH 3.0. The external Na concentration, at which maximum influx rate is achieved, is much higher in acid environments than in neutral media. Moreover, the maximum affinity is reached around pH 7.
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