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Spatial mixing of mitochondrial lineages and greater genetic diversity in some invasive populations of the American mink (Neovison vison) compared to native populations

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Abstract

The genetic characteristics of introduced populations have a relevant impact on their ability to establish and spread. The American mink (Neovison vison), native to North America, is an important invasive species in the Iberian Peninsula. Here, we used mitochondrial DNA sequences data to investigate the genetic diversity and phylogeographic structure of invasive versus native populations of this species. We also evaluated whether genetic diversity in invasive populations could be explained by the genetic characteristics of the native sources from which they derived. Phylogenetic analysis revealed two major lineages in the native range, which indicated a clear separation between western and eastern populations. On the contrary, we found no evidence of genetic structure in the invasive range. This was probably the result of the diverse origins of the released specimens and the rapid expansion and encounters of the introduced populations. We detected spatial mixing of both North American lineages in several sampling localities of the north central area of the Iberian Peninsula, giving rise to high levels of genetic diversity in some areas compared to North American populations. This could potentially lead to higher fitness of these individuals and thus increase the population viability and invasiveness of this species. These results point to the need to better study the populations in which lineages mix and, if necessary, intensify control efforts in them.

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Acknowledgements

This work was financially supported by the research Project CGL2014-53968-P of the “Plan Nacional I+D+I del Ministerio de Economía y Competitividad” (Spain) to J.C., cofinanced with FEDER funds. K.G. was funded by a “Becas Chile-CONICYT” PhD studentship. We acknowledge the following institutions and administrations for samples: University of Alaska Museum (Mammal Collection), Museum of Southwestern Biology (Division of Mammals), Cornell University Museum of Vertebrates (Mammal Collection), Generalitat de Catalunya, Gobierno de La Rioja, Junta de Castilla y León, Xunta de Galicia (Dirección Xeral de Conservación da Natureza), Generalitat Valenciana (Centro de Recuperación de Fauna La Granja de El Saler) and Gobierno de Navarra. We wish to thank to all technicians of administrations involved in sample collection and management, in particular: Asun Gómez, Rafael Romero, Juan del Nido, Olga Alarcia, Gabriel de Pedro, Iñigo Zuberogoitia, Gloria Giralda and José María Gil. We also thank Oliver Hawlitschek and Marina Querejeta for helpful comments on the manuscript.

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Correspondence to Karla García.

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García, K., Melero, Y., Palazón, S. et al. Spatial mixing of mitochondrial lineages and greater genetic diversity in some invasive populations of the American mink (Neovison vison) compared to native populations. Biol Invasions 19, 2663–2673 (2017). https://doi.org/10.1007/s10530-017-1475-4

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  • DOI: https://doi.org/10.1007/s10530-017-1475-4

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