Abstract
We studied the genetic structure of the Mediterranean killifish Aphanius fasciatus. Analysis of the sequence variation in a 372-bp portion of the mitochondrial control region in 623 fish from 27 sampling sites along the species’ distributional range (Tyrrhenian coast, Sardinia, Sicily, Adriatic coast, Malta, Tunisia, and Greece) yielded 120 distinct haplotypes. Most of the haplotypes are unique, and only 15 % are shared among different populations. The high F ST value (=0.80) suggests a strong population genetic structuring. The phylogenetic analysis based on Bayesian inference, maximum likelihood and maximum parsimony, and the median-joining network show a sharp separation of the Southeastern Sicilian populations (belonging to the Hyblean region) and of the fluvial Tunisian population of Rio Melah from the others. The Adriatic, the Eastern Sicilian, and the Greek populations are well differentiated, while the group of populations from the Central-Western Mediterranean does not show a clear pattern of differentiation. Our findings indicate that the current genetic structuring of A. fasciatus reflects historical geographical patterns occurring within the Mediterranean basin from the Late Miocene to the Pleistocene. The presence of divergent evolutionary entities in the Hyblean region and the Tunisian Rio Melah supports their inclusion as target areas for the conservation of A. fasciatus.
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Acknowledgments
We are grateful to Carlo Costantini (Corpo Forestale dello Stato—Tarquinia), Alan Deidun (University of Malta), Maria Pala (University of Sassari), Pasquale Trotta (CNR—Lesina) for providing a part of the specimens used in the present study. We are also grateful to Bettina Reichenbacher, Ludwig-Maximilians University Munich, for her useful suggestions.
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Ferrito, V., Pappalardo, A.M., Canapa, A. et al. Mitochondrial phylogeography of the killifish Aphanius fasciatus (Teleostei, Cyprinodontidae) reveals highly divergent Mediterranean populations. Mar Biol 160, 3193–3208 (2013). https://doi.org/10.1007/s00227-013-2307-4
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DOI: https://doi.org/10.1007/s00227-013-2307-4