Genetic variability and gene flow in populations of Crassostrea virginica (Gmelin) from the northern Gulf of Mexico
MetadataShow full item record
Allelic variation at 23 presumptive gene loci was assessed among 10 populations of Crassostrea virginica from the northern Gulf of Mexico, extending from Biloxi Bay, Mississippi, westward to Galveston Bay, Texas. Ten of the 23 loci surveyed proved to be monomorphic across all population samples. The percentage of polymorphic loci among populations ranged from 30.4-39.1 with a mean of 34.8. Allelic variation at 6 gene loci, Aat-1, Icdh-1, Icdh-2, Mdh-1, Mdh-2, and Iddh, was limited to the occurrence of 1 or a few rare alleles usually in the heterozygous condition. Allelic diversity was consistently highest among all populations at 5 loci, Gpi, Lap-1, Mpi, Pgdh, and Pgm-1. Estimates of average heterozygosity among populations appeared to be slightly lower than reported for eastern Gulf coastal and Atlantic populations of this species. Gene flow among populations, as measured by the average number of migrant individuals/generation (Nm), was quite high (Nm = 7.25). The allelic frequency differences observed did not represent a discernible geographic pattern; differentiation due to local selective pressures is a more likely explanation
Showing items related by title, author, creator and subject.
Population structure of spotted seatrout inhabiting the Texas Gulf Coast: An allozymic perspective King TL; Pate HO (, 1992)Spotted seatrout Cynoscion nebulosus (N = 674) from 12 geographic populations along the Texas and northern Mexico Gulf coasts were surveyed to determine population structure as indicated by the distribution of electrophoretically ...
Grady JM; Soniat TM; Rogers JS (, 1988 198)Allelic variation at 23 presumptive gene loci was assessed among 10 populations of Crassostrea virginica from the northern Gulf of Mexico, extending from Biloxi Bay, Mississippi, westward to Galveston Bay, Texas, using ...
Possible genetic influences on the growth rate and survival of two populations of Crassostrea virginica Martinez MC; DiMichele L (, 1992 199)Laguna Madre (LM), Texas, has unique populations of oysters, Crassostrea virginica , that are genetically distinct from all other Atlantic populations. The LM is also a unique environment, characterized by extreme ...