995 Genetic variation within a dimorphic species, Cryptopecten vesiculosus (Bivalvia, Pectinidae)

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  • Genetic variation within a dimorphic species,Cryptopecten vesiculosus(Bivalvia,Pectinidae)
  • Genetic variation within a dimorphic sp

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An allozyme analysis of Cryptopecten vesiculosus was conducted to obtain biochemical evidence to determine whether the two discrete morphologic "phenotypes" represent dimorphism or two sympatric species. A total of 17 loci were extracted with polyacrylamide gel electrophoresis from specific tissues of the individuals collected from Sagami Bay, Japan. Of the 17 loci examined, seven (41.2%) were polymorphic, and avarage heterozygosity per individual was calculated at 0.20, indicating a high level of genetic variation in this species. The allozyme patterns are not statistically different between the two "phenotypes", confirming the previous interpretation based on morphologic and ecologic evidence that the two "phenotypes" represent discontinuous intrapopulational variants.

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