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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. 2 — Viral migration and migratory flyways in North America. Viral migration and migratory flyways in North America inferred from the PB1, PA, NP, and MP gene segments. US states and Canadian provinces (locations) are color-coded according to their flyway assignment. No viruses were analysed 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