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Garton, D.W., A.M. Stoeckmann, and W.R Haag, 1991. PGI Genotype-Dependent Metabolism in the Zebra Mussel, Dreissena polymorpha, Ohio Sea Grant College Program, The Ohio State University Reprinted from American Zoologist 31:134A (1991) PGI Genotype-Dependent Metabolism in the Zebra Mussel, Dreissena polymorphaThe phosphoglucose isomerase (PGI) locus is highly variable, with four common and three rare alleles. Weight-standardized oxygen consumption was measured at ambient lake temperature, 23.8°C, and following transfer to 31.2°C, using a differential respirometer. Pooled PGI homozygotes had significantly higher average metabolic rates than pooled heterozygotes. Metabolic rates also varied significantly with genotype. Although there were no significant differences among common genotypes, average metabolic rates of homozygotes of one rare allele (e/e) were significantly greater than all other genotypes. Patterns of genotype-dependent metabolism were similar at 23.8 and 31.2°C. PGI e/e homozygotes occur at higher frequencies in larvae than in one-two month old juvenile and adult populations. Genotype-dependent metabolism provides a possible mechanism for selection maintaining variability at the PGI locus in Dreissena polymorpha. Contact: D.W. Garton, Ohio Sea Grant College Program, The Ohio State
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