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Journal of Experimental Biology 61,35-45 (1974)
Published by Company of Biologists 1974

Calcium Balance at the Postmoult Stage of the Freshwater Crayfish Austropotamobius Pallipes (Lereboullet)

PETER GREENAWAY ¹

¹ Department of Zoology, The University, Newcastle upon Tyne NE1 7RU; School of Zoology, University of New South Wales, P.O. Box 1, Kensington, S.W., Australia 2033

Net uptake of calcium by Austropotamobius begins 15-30 min after the moult and rapidly reaches a maximum level (2 µmoles/g/h at 10°C) which is maintained throughout stages A and B. At stage C₁ the rate of net uptake falls sharply to a lower level which is gradually reduced until equilibrium is reached at C₄. The uptake mechanism is near-saturated at 0.4 mM-Ca/l and half-saturated at 0.13 mM-Ca/l. In the absence of external HCO₃^- net uptake is reduced. Calcium uptake is against an electrochemical gradient. The concentration of ionised calcium in the haemolymph remains unchanged during the intermoult cycle.

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