Blood calcium concentrations are elevated during a hypercapnic acidosis in the terrestrial crab Gecarcinus lateralis, but not in the aquatic Callincetes sapidus. The increase occurs concomitantly with a rise in blood HCO3- and partial restoration of resting blood pH values. It is believed that in G. lateralis that a source of CaCO3, possibly the shell, is being dissolved for buffering purposes.

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