Abstract

AUozyme variation of a Mysella tumida population in Patricia Bay, B.C., Canada was investigated at the phosphoglucomutase (PGM) locus. Seven alleles were detected. The observed frequency of allelic combinations did not differ significantly from random mating expectations (0.25 < P < 0.50), however, heterozygosity levels were slightly greater than expected (Selander's D = 0.022). These results, together with previous work on the M. tumida reproductive cycle, indicate that natural populations of this bivalve rarely, if ever, self-fertilize.

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