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. 2019 Jun 12;9:8546. doi: 10.1038/s41598-019-44996-5

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© The Author(s) 2019

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as 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 images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/.

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Two hypotheses for the interaction between Kentish and White-faced Plovers: (A) shallow divergence with widespread gene flow - a genomic cline from northern to southern China, with the greatest differentiation seen at either end of the spectrum of distribution and a broad hybrid zone, and (B) deeper divergence with limited gene flow – the two taxa meet at a narrow contact zone and show limited hybridization.