Genetic structure and differentiation of the fire salamander Salamandra salamandra at the northern margin of its range in the Carpathians

in Amphibia-Reptilia
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Amphibian populations occurring at the margin of the species range exhibit lower genetic variation due to strong genetic drift and long-term isolation. Limited mobility and site fidelity together with habitat changes may accelerate genetic processes leading to local extinction. Here, we analyze genetic variation of the fire salamander subspecies Salamandra s. salamandra inhabiting the Outer Carpathian region in Poland, at the northern border of its distribution. Nuclear DNA polymorphism based on 10 microsatellite loci of 380 individuals sampled in 11 populations were analysed to measure gene flow between subpopulations and possible long-term isolation. Mitochondrial DNA control region analysis among 17 individuals representing 13 localities was used to detect the origin of populations which colonized Northern Europe after the last glaciation. Overall, pairwise FST’s and AMOVA test of ‘among group’ variation showed little differences in the allele frequencies and relatively high local gene flow. However, Bayesian clustering results revealed subtle structuring between eastern and western part of the studied region. Two extreme marginal populations from the Carpathian Piedmont revealed reduced genetic variation which may be attributed to strong influence of genetic drift. Only one mitochondrial DNA haplotype (type IIb) was found in all individuals and suggest that after the Last Glacial Maximum Salamandra salamandra migrated to the North-Western Europe from the single glacial refugium placed in the Balkan Peninsula.

Genetic structure and differentiation of the fire salamander Salamandra salamandra at the northern margin of its range in the Carpathians

in Amphibia-Reptilia

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References

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Figures

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    Top: Distribution of Salamandra salamandra according to the International Union for Conservation of Nature (left) and sampling localities in Poland (right). Black points (1-11) represent populations taken for microsatellite study; white points (12-13) represent additional localities included for mitochondrial DNA analysis. Population numbers refer to table 1. Bottom: Genetic structuring for (a) K = 2 and (b) K = 5. This figure is published in colour in the online version.

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    Nonmetric two-dimensional scaling of the FST matrix for all populations (stress value = 0.0416).

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    The neighbour joining tree of mitochondrial DNA haplotypes of the fire salamander Salamandra salamandra subspecies belonging to clade C, described and numbered as previously published in Steinfartz, Veith and Tautz (2000), including the Sudetes (described by Ogrodowczyk, 2011) and populations of Polish part of the Carpathians. Numbers at nodes represent the bootstrap values.

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