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. 2019 Dec 6;9:18531. doi: 10.1038/s41598-019-54980-8

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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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Overlap of dams with freshwater megafauna species richness and share in threatened species for the Balkan area. Top: (i) Choropleth map of sub-catchments (HydroBASINS level 8) according to species richness and threat status (species presence reference scenario). (ii) “Density” of dams per 10⁵ km² in different sub-catchments according to richness-threat categories. Existing dams: bold colour; Future hydropower dams: striped colour. Bottom: Location of existing dams (iii) and future hydropower dams (iv) and their individual categorization according to species richness and proportion of threatened species. Size of the dots indicates size of the dam (existing: dam height in m; future: capacity in MW – not scaled). Colour code: Green (A): low richness (≤5 species), low share in threatened species (≤50%); Yellow (B): high richness (>5 species), low share in threatened species; Orange (C): low richness, high share in threatened species (>50%); Red (D): high richness, high share in threatened species. For more details, please see legend in subfigure (iii).