Abstract
A negative correlation between allozyme heterozygosity and shell shape variability in the blue mussel, Mytilus edulis L. is reported. For a population sample of 103 individuals taken from the Cape Cod Canal, Mass., U.S.A., we have estimated shell size and shape with 14 measurements and allozyme heterozygosity with four polymorphisms. Morphological measurements were treated with principal components analysis, and projections on the first four principal axes were used to measure size and shape. Mean size and mean shape were not related to enzyme heterozygosity, but shell shape variability decreased as enzyme heterozygosity increased.
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