Fig. 5. Electrolyte (Na⁺ + K⁺) outputs in the CF (concentration x CF volume) as a function of water flux. (A) Electrolyte outputs were highest for the most dilute diets, and lowest for concentrated diets without supplementary water, when birds voided minimal volumes of CF. Values are means ± 1 S.D. (N=7). (B) Electrolyte output increased significantly with increasing cloacal fluid volume (note log scale). Values are individual data (N=7) for the 14 diet trials with (solid circles) or without (open diamonds) supplementary water; the regression line is fitted to data from all diet trials (electrolyte output=0.0008[CF volume+1] + 0.0047). The volume of CF excreted per day is given as log(ml+1) since the log of values <1 yields negative values.

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