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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
In: Journal of Fish Biology. Fisheries Society of the British Isles: London,New York,. ISSN 0022-1112, more
Peer reviewed article  

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Keywords
    Allozymes; Conservation; Differentiation; Differentiation; Distance; Diversity; Fish; Gene flow; Genetic distance; Genetic diversity; Marine; 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

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  • Maltagliati, F., more

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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