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. 2017 May 25;17:118. doi: 10.1186/s12862-017-0965-4

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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. 1 — Viral migration and migratory flyways in North America. Viral migration rates were inferred from the PB2 gene segment (an exemplar of the AIV data set as a whole). US states and Canadian provinces (locations) are color-coded according to their flyway assignment. No viruses were analyed from locations that have a light color. The color of each line connecting two locations corresponds to the inferred rate. The absence of a line connecting two locations suggests that the migration rate was 0