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. 2016 Nov 7;16:237. doi: 10.1186/s12862-016-0817-7

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 1 — Sampling localities and population genetic structure from mitochondrial and nuclear data. Legend: a Coloured circles indicate sample origin; circle sizes are scaled to sample size. Dashed ovals group the sampling localities according to the three main flyways (represented with arrows): western, central and eastern (WF, CF and EF, respectively). b Median joining network based on cytochrome b haplotypes (mtDNA), hatch marks on the lines connecting circles indicate mutational steps. c Principal component analysis based on SNP data (nuDNA)