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. 2018 Apr 16;8:5998. doi: 10.1038/s41598-018-24454-4

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© The Author(s) 2018

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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Distribution of the distances between ponds and the nearest linear anthropogenic structure (causeway, canal or weir) (a), and between ponds associated with weirs and the nearest V-shaped structure (b). White bars represent the distribution of observed distances. Black dots represent the mean values for 10,000 simulated random distributions of the same number of ponds (vertical bars representing standard deviations do not exceed the radius of the dots and are not visible).