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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 orientation of V-shaped structures (from the widest part to the point of the V) (a) and of ponds (both those associated with linear structures and those that are isolated) from the lowest point in the centre to the highest point of the berm (b), in the two sub-basins. (c) Size distribution of the angle of the arc formed by woody plant presence around ponds. (d) Distribution of the orientation of rim arcs covered with woody plants, cumulated over all ponds. Solid lines represent the mean azimuth for each distribution. Dotted lines represent the extreme values of the putative direction of water flow during the high-water season for each sub-basin.