Abstract
Genetic variation in the enzymes mannose phosphate isomerase and glucosephosphate isomerase was surveyed in the amphipod Megalorchestia californiana Brandt on the Pacific coast of the United States. In a series of samples from Washington state to southern California, both enzyme loci exhibited differences of allele frequency associated with latitude. Geographic differences among nine Oregon samples were not consistently associated with any obvious environmental variable.
Within the Oregon samples, the Mpi locus exhibited a heterozygote deficit in the smallest size class. Larger size classes did not differ from Hardy-Weinberg proportions. Possible explanations for this pattern include genotype-related differences in behavior, growth or viability.
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McDonald, J. Size-related and geographic variation at two enzyme loci in Megalorchestia californiana (Amphipoda: Talitridae). Heredity 54, 359–366 (1985). https://doi.org/10.1038/hdy.1985.49
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DOI: https://doi.org/10.1038/hdy.1985.49
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