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The major climatic oscillations during the Quaternary Ice Age heavily influenced the distribution of species and left their mark on intraspecific genetic diversity. Past range shifts can be reconstructed with the aid of species distribution modeling and phylogeographical analyses. We test the responses of the different members of the genus  Triturus  (i.e. the marbled and crested newts) as the climate shifted from the previous glacial period (the Last Glacial Maximum, ~21 Ka) to the current interglacial.    Results  We present the results of a dense mitochondrial DNA phylogeography (visualizing genetic diversity within and divergence among populations) and species distribution modeling (using two different climate simulations) for the nine  Triturus  species on composite maps.    Conclusions  The combined use of species distribution modeling and mitochondrial phylogeography provides insight in the glacial contraction and postglacial expansion of  Triturus . The combined use of the two independent techniques yields a more complete understanding of the historical biogeography of  Triturus  than both approaches would on their own.  Triturus  newts generally conform to the ‘southern richness and northern purity’ paradigm, but we also find more intricate patterns, such as the absence of genetic variation and suitable area at the Last Glacial Maximum ( T. dobrogicus ), an ‘extra-Mediterranean’ refugium in the Carpathian Basin ( T. cristatus ), and areas where species displaced one another postglacially (e.g.  T. macedonicus  and western  T. karelinii ). We provide a biogeographical scenario for  Triturus , showing the positions of glacial refugia, the regions that were postglacially colonized and the areas where species displaced one another as they shifted their ranges.

Tracing glacial refugia of Triturus newts based on mitochondrial DNA phylogeography and species distribution modeling