Genetic Variation in a Gradient of Environmental Variability: Marine Bivalvia (Mollusca)

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Science  06 Apr 1973:
Vol. 180, Issue 4081, pp. 75-76
DOI: 10.1126/science.180.4081.75


Six bivalve mollusk species were sampled for genetic variability at two enzyme synthesizing loci. The effective number of alleles and absolute number of alleles decreased with depth of burial within the sediment, intertidally, and with depth of water, subtidally. It is proposed that environmental variability regulates genetic variability at these two loci.