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J. Moll. Stud. (1987), 53, 223-228
© The Malacological Society of London 1987

research-article

PHOSPHOGLUCOMUTASE ALLOZYME EVIDENCE FOR AN OUTCROSSING MODE OF REPRODUCTION IN THE HERMAPHRODITIC BROODING BIVALVE MYSELLA TUMIDA (GALEOMMATACEA)

DIARMAID Ó FOIGHIL1,* and DOUGLAS J. EERNISSE2,**

1Biology Department, University of Victoria P.O. Box 1700 Victoria, B.C. Canada V8W 2Y2; and 2Friday Harbor Laboratories, University of Washington Friday Harbor, WA 98250, U.S.A.

Allozyme 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.

*Present Address: Friday Harbor Laboratories, University of Washington, Friday Harbor, WA 98250, U.S.A.

**Present Address: Museum of Zoology, University of Michigan, Ann Arbor, M1 48109, U.S.A.

(Received 30 December 1986;
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