Abstract
Abstract Enzyme variation in sheltered‐ and exposed‐marine populations and an estuarine mudflat population of the chiton Sypharochiton pelliserpentis was examined by polyacrylamide gel electrophoresis. Six loci were analysed, of which Idh‐1, Idh‐2, and Me‐1 were monomorphic and Est‐2, Mdh‐1, and Me‐2 were polymorphic. All populations shared the same alleles at all loci. A heterozygote deficiency was detected at the Est‐2 locus for the exposed‐marine population and a hetero‐zygote excess was found at the Mdh‐1 locus for the sheltered‐marine population where allele frequencies were associated with chiton age. Differences were found in allele frequencies between the sheltered‐ and exposed‐marine populations at the Est‐2 locus and between females of the marine and estuarine populations at Mdh‐1 locus. The Idh‐2 locus showed variation in enzyme activity which was neither age nor sex specific, but appeared to be associated with different habitats. Marine population subsamples from high‐shore and low‐shore level...
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