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We have studied phenotypic variation in six enzymes of Lasaea, a taxonomically complex genus of small brooding clams, from nine northeastern Pacific sites. Each of the individuals examined produced one of five combinations of electromorph patterns. Lasaea phenotypes could be differentiated into two main types, one containing two and the other three phenotype combinations. Samples from each population contained from one to three phenotype combinations and there was no evidence for crossbreeding among phenotypes. These results are strongly at variance with random mating expectations and indicate that the phenotype combinations represent reproductively isolated strains. This is substantiated by a more detailed study of the McNeill Bay, British Columbia, population where both main strains coexist. Electrophoretic characterization of Lasaea from individual 100 cm2 samples of barnacle cover revealed that strains are not spatially segregated. Progeny of (1) pair mating experiments, (2) brooding field individuals...

Geographically Widespread, Non-hybridizing, Sympatric Strains of the Hermaphroditic, Brooding ClamLasaeain the Northeastern Pacific Ocean