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Journal of Experimental Biology 54,485-496 (1971)
Published by Company of Biologists 1971

The Effect of Calcium on Sodium Influx and Loss in Gammarus (Amphipoda)

D. W. SUTCLIFFE ¹

¹ Freshwater Biological Association, The Ferry House, Far Sawrey, Ambleside, Westmorland

1. In Gammarus pulex and G. duebeni sodium influx from sodium chloride solutions and sodium loss into de-ionized water were not affected in a consistent manner by the presence of calcium ions at concentrations up to about 2 mM/l.

2. Sodium influx in G. pulex was depressed by the addition of 2-10 mM/l. calcium.

3. Sodium influx in G. zaddachi was stimulated by the addition Of 2-4 mM/l. calcium chloride but depressed by the addition of 20-53 mM/l. calcium chloride.