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Journal of Experimental Biology 54,609-620 (1971)
Published by Company of Biologists 1971

Calcium Regulation in the Freshwater Mollusc Limnaea Stagnalis (L.) (Gastropoda: Pulmonata) : II. Calcium Movements Between Internal Calcium Compartments

PETER GREENAWAY ¹

¹ Department of Zoology, University of Newcastle upon Tyne

1. Three major calcium compartments have been identified in L. stagnalis: the shell, the blood and the fresh tissues.

2. The distribution of ⁴⁵Ca, absorbed from the medium, in the tissues of L. stagnalis has been studied. Absorbed calcium appears first in the blood and then in the shell and other tissues.

3. 30% of the total fresh tissue calcium and about 20% of mantle calcium exchanges with blood calcium. A continual exchange between shell and blood calcium occurs.

4. During net calcium loss from L. stagnalis a net movement of calcium from shell to blood occurs at a rate similar to the rate of net loss. During net calcium uptake, the reverse movement from blood to shell at a rate similar to the rate of net uptake occurs.

5. A simple mechanism which might account for the control of blood calcium concentration has been proposed.