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Journal of Experimental Biology 88,205-218 (1980)
Published by Company of Biologists 1980

Mechanisms of Resorption and Deposition of Calcium in the Carapace of the Crab Carcinus Maenas

ROBERT D. ROER ¹

¹ Department of Zoology, Duke University, Durham, North Carolina, U.S.A. 27706; Institute for Marine Biomedical Research, 7205 Wrightsville Avenue, Wilmington, North Carolina, U.S.A. 28403.

1. Premoult resorption of Ca from the carapace of Carcinus involves the active inward transport of Ca by the hypodermis with maximal rates occurring in stage D₂ of the moult cycle.

2. Postmoult calcification of the carapace involves the active outward transport of Ca by the hypodermis with maximal rates occurring in stages A₁ and A₂ of the moult cycle.

3. Bidirectional active transport of Ca by Carcinus hypodermis may accomplished by means of a quercitin-sensitive Ca-ATPase and a Na/Ca exchange mechanism in conjunction with observed changes in epithelial cell shape and size.

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