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. 2017 Feb 16;18:174. doi: 10.1186/s12864-017-3525-9

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© The Author(s). 2017

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. 2 — Principle component analysis of canids and linkage disequilibrium across populations. a PCA results for the first two PCs were plotted here for 1237 canids. The percentage of variances explained by the two PCs are also shown. Different symbols corresponding to different populations are shown in the legend (* marks sequenced samples in this study). b PCA analysis of group 1 dogs. The percentage of variances explained by the PCs and the symbols are shown similar to panel a. In the legend, * marks sequenced samples in this work. c Linkage disequilibrium of the gray wolves, group 1 dogs as well as other dogs are plotted as boxplots. Six wolf populations, eight group 1 dog populations as well as 66 other dog populations are shown in this figure. Chow Chow is shown as an asterisk. The Y axis (the H statistic) is the numerical measurement of linkage disequilibrium across a 500 kb window (see Methods)