Abstract
Rates of calcium carbonate removal from shell pieces of Argopecten irradians (Say) and Mercenaria mercenaria (L.) were dependent on the type of etching fluid used and not shell origin. Etching was uniform over the entire shell surface, but surface morphology differed with etching fluids. Peak radioactivity was in early eluant fractions of shells etched immediately after radioactive labeling, and in later fractions when individuals were placed in isotope-free seawater after labeling. The etching technique can measure growth during the labeling period and subsequently by estimating the amount of calcium in fractions prior to the radioactive peak. Geometry of shell layers influenced the pattern of radioactivity seen in fractions. Peak location varied inside and outside the pallial line of individual M. mercenaria. A significant portion of the inorganic carbon used in shell formation by M. mercenaria was derived from metabolic CO2.
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Communicated by S. K. Pierce, College Park
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Dillaman, R.M., Ford, S.E. Measurement of calcium carbonate deposition in molluscs by controlled etching of radioactively labeled shells. Mar. Biol. 66, 133–143 (1982). https://doi.org/10.1007/BF00397186
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DOI: https://doi.org/10.1007/BF00397186