A preliminary investigation of allozyme genetic variation and population geographical structure in Aphanius fasciatus from Italian brackish-water habitats
Maltagliati, F. (1998). A preliminary investigation of allozyme genetic variation and population geographical structure in Aphanius fasciatus from Italian brackish-water habitats. J. Fish Biol. 52: 1130-1140. https://dx.doi.org/10.1006/jfbi.1998.0656 In: Journal of Fish Biology. Fisheries Society of the British Isles: London,New York,. ISSN 0022-1112; e-ISSN 1095-8649, more |   |
| Keywords | Biological development > Differentiation
Characteristics > Diversity
Conservation
Differentiation
Disciplines > Biology > Genetics > Population genetics > Gene flow
Distance
Enzymes > Allozymes
Fauna > Aquatic organisms > Aquatic animals > Fish
Genetic diversity
Genetic parameters > Genetic distance
Marine
Population characteristics > Population structure
Aphanius fasciatus (Valenciennes, 1821) [WoRMS]; Cyprinodontidae Wagner, 1828 [WoRMS]; Cyprinodontiformes [WoRMS]; Teleostei [WoRMS]
MED, Italy [Marine Regions]
Brackish water | | Author keywords | aphanius fasciatus; Genetic variations; Brackish-water habitats; Fresh-water; Isolation-by-distance; Pupfish |
| Abstract | A total of 150 individuals from Aphanius fasciatus from coastal brackish-water habitats was analysed by allozyme electrophoresis to collect data on its genetic variation. From 22 enzymes, 43 putative enzyme-coding loci were resolved, 12 of which were polymorphic at P-0.99 level. Only one of the 31 probability tests showed a significant departure from the Hardy-Weinberg equilibrium. Aphanius fasciatus showed low levels of genetic polymorphism, with expected heterozygosity values ranging from 0.027 (S.E.=0.013) to 0.064 (S.E.=0.023). Nei's genetic distances between populations ranged from 0.002 to 0.042. Weir & Cockerham F-statistics showed high levels of genetic heterogeneity among populations (jackknifed theta=0.302, S.E.=0.045) and estimates of N-m were <1, indicating restricted gene flow. Significant positive correlation between genetic distance and geographical distance matrices, detected by Mantel's test (g=1.941; P<0.001), is consistent with the prediction that the species is genetically structured by isolation-by-distance. |
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