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Population genetics of pike, genus Esox (Actinopterygii, Esocidae), in Northern Italy: evidence for mosaic distribution of native, exotic and introgressed populations

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An Erratum to this article was published on 14 June 2017

Abstract

Esox flaviae represents the native esocid species of the Italian peninsula at present potentially highly threatened by the diffusion of exotic E. lucius. Here, we present a novel mtDNA (N = 272) and microsatellite (N = 275) dataset including 13 test and 3 reference samples, aimed to delineate the distribution of the native as well as the exotic species and to unravel potential introgressive hybridisation between the two species in Northern Italy. We highlight a complex mosaic distribution of both species, with contrasting occurrence even between neighbouring sites. Significant genetic substructure is still observed within E. flaviae, while the dispersal of the invader seems to be promoted by restocking actions. In addition, we prove the existence of introgressive hybridisation between native and exotic pikes. Here, gender-biased hybridisation is suggested, with native E. flaviae constituting the predominant ‘mother species’ in the hybridisation process. Finally, we underline the need for a revision of fisheries management regulations, for which a nation-wide and exhaustive genetic screening in the near future should build the scientific basis.

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Acknowledgements

The authors are grateful to Fisheries Offices (H. Erhard and H. Grund, Autonomous Provinces of Bolzano/Bozen; S. Filippini and R. Sala, Province of Lodi), researchers (E. Eschbach, Leibniz-Institute for Freshwater Ecology and Inland Fisheries, Department of Biology and Ecology of Fishes; T. Friedrich and G. Unfer, BOKU Vienna – University of Natural Resources and Life Sciences, Institute for Hydrobiology and Aquatic Ecosystem Management), free-lance ichthyologists (L. Betti; S. Rossi), professional fishermen (A. Andreis) and anglers (W. Arnoldo; Fisheries Association of Appiano/Eppan) who contributed to the collection of tissue samples.

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Correspondence to Andrea Gandolfi.

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Handling editor: Christian Sturmbauer

An erratum to this article is available at http://dx.doi.org/10.1007/s10750-017-3250-z.

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10750_2016_3083_MOESM1_ESM.pdf

NewHybrids analysis on a simulated dataset including individuals of E. lucius, E. flaviae and different hybrid classes (F1, F2 and backcrosses to E. lucius and E. flaviae). Supplementary material 1 (PDF 106 kb)

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Gandolfi, A., Ferrari, C., Crestanello, B. et al. Population genetics of pike, genus Esox (Actinopterygii, Esocidae), in Northern Italy: evidence for mosaic distribution of native, exotic and introgressed populations. Hydrobiologia 794, 73–92 (2017). https://doi.org/10.1007/s10750-016-3083-1

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