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Biol Bull 167: 186-199. (August 1984)
© 1984 Marine Biological Laboratory
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GROWTH RATES OF THE SEA SCALLOP, PLACOPECTEN MAGELLANICUS, DETERMINED FROM THE 18O/16O RECORD IN SHELL CALCITE

DAVID E. KRANTZ 1, DOUGLAS S. JONES 2, and DOUGLAS F. WILLIAMS 3

1 Marine Science Program, University of South Carolina, Columbia, South Carolina 29208
2 Department of Geology, University of Florida, Gainesville, Florida 32611
3 Department of Geology and Belle W. Baruch Institute, University of South Carolina, Columbia, South Carolina 29208

Present age determination techniques for the sea scallop, Placopecten magellanicus (Gmelin), rely on the subjective interpretation of lines on the shell exterior as representing periods of annual growth. This study compares scallop age and growth estimates from the external line method with a stable isotope technique. The oxygen isotopic records from serially sampled carbonate powders taken from two scallop specimens collected alive off the Virginia coast show annual cycles which closely approximate the isotopic composition predicted as a function of observed salinity and temperature. Since these annual isotopic cycles are controlled by physical-chemical processes, they provide an independent time scale for age and growth rate determination. Growth rates determined from the isotopic records are roughly twice those estimated from the external line method and from a published average growth curve for Placopecten magellanicus.

Submitted on April 10, 1984
Accepted on May 30, 1984




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