Phosphoglucose isomerase and esterase phenotypes in Crassostrea angulata and C. gigas

The phenotype distributions and the allele frequencies of the phosphoglucose isomerase and esterase loci examined in the samples of Crassostrea angulata (Essex, England) and C. gigas (Brittany) do not differ significantly and the two populations as such are indistinguishable. The validity of the spe...

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Bibliographic Details
Published in:Biochemical systematics and ecology 1974, Vol.2 (2), p.93-96
Main Authors: Mathers, Nigel F., Wilkins, Noël P., Walne, Peter R.
Format: Article
Language:English
Subjects:
alleles
Bivalvia
C. gigas
Crassostrea angulata
electrophoretograms
esterase
locus
Ostriedae
phenotypes
phosphoglucose isomerase
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Summary:The phenotype distributions and the allele frequencies of the phosphoglucose isomerase and esterase loci examined in the samples of Crassostrea angulata (Essex, England) and C. gigas (Brittany) do not differ significantly and the two populations as such are indistinguishable. The validity of the species C. angulata is questioned and it is postulated that the two samples may be geographic isolates of the same species, i.e. C. gigas. The hatchery reared population of C. gigas from Conway is distinguishable from the other samples of Crassostrea examined. The lack of phenotype diversity is attributed to founder effects of the small parental stock imported in 1965. The distributions of all phenotypes are in agreement with Hardy-Weinberg expectations. Phosphoglucose isomerase (E.C. 5.3.1.9.) is a dimer governed by at least four alleles in C. angulata and five alleles in C. gigas. The slower ( Es-S) zone of the esterase electrophoretogram would appear, in both species to be governed by four alleles at a single locus. There was no esterase banding which was specific to either species of Crassostrea.
ISSN:0305-1978
1873-2925
DOI:10.1016/0305-1978(74)90010-6