Temporal genetic variation in a population of Aphanius fasciatus (Cyprinodontidae) from a brackish-water habitat at Elba Island (Italy)
Maltagliati, F.; Camilli, L. (2000). Temporal genetic variation in a population of Aphanius fasciatus (Cyprinodontidae) from a brackish-water habitat at Elba Island (Italy). Environ. Biol. Fish. 57(1): 107-112. https://dx.doi.org/10.1023/A:1007604831242
In: Environmental Biology of Fishes. Junk: The Hague. ISSN 0378-1909; e-ISSN 1573-5133, more
Allozyme electrophoresis was used to assess temporal genetic variation in three successive generations of the Mediterranean killifish, Aphanius fasciatus. Samplings were carried out in 1995, 1996 and 1997 in a brackish-water habitat at Elba Island, Italy and a total of 212 specimens were collected. The five loci for which polymorphism has been detected in a previous study were assayed. Mean expected heterozygosity values [H=0.397 (SE 0.077), H=0.336 (SE 0.092) and H=0.313 (SE 0.092) in 1995, 1996 and 1997, respectively] were not significantly different by ANOVA test. Deviations from Hardy-Weinberg equilibrium were minimal, with only one out of the 15 probability tests showing a significant departure from the equilibrium; whereas genotypic linkage disequilibrium was not detected. Values of Nei's genetic distance were lower than 0.04. Temporal genetic variation in the A. fasciatus population at Elba Island was observed, with F-statistics indicating significant genetic divergence among samples (theta=0.035, SE 0.027, p < 0.001). Genetic drift acting on two loci (GPD-1* and LDH-3*) is presumably the main force determining the temporal genetic heterogeneity observed; however, the occurrence of selection on individual loci and/or sampling error cannot be excluded. The observed allelic variation among generations in a single population of A. fasciatus is much less than levels observed among geographically discrete samples in previous studies.
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