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. 2020 Oct 6;10:16536. doi: 10.1038/s41598-020-73739-0

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© The Author(s) 2020

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 licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence 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 licence, visit http://creativecommons.org/licenses/by/4.0/.

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Map of Gammarus fossarum sampling sites. Dots indicate sampling sites (498); white with black contour represent new original data (206 sites), grey with black contour indicate sites associated with authors' previous publications (198 sites), black with white contour indicate sites for data derived from other published papers (94 sites). To prevent overlap of very closely located sites, some positions are slightly shifted. Thin blue-grey lines correspond to first-order river, and black lines are country borders. Dashed grey line represents the simplified distribution range limits for G. fossarum, adapted from Piscart and Bollache⁹⁶. Countries (19) are indicated by their corresponding two-letter ISO codes: AL, Albania; AT, Austria; BA, Bosnia and Herzegovina; BE, Belgium; BG, Bulgaria; CH, Switzerland; CZ, Czechia; DE, Germany; FR, France; HR, Croatia; HU, Hungary; IT, Italy; NL, Netherlands; PL, Poland; RO, Romania; RS, Serbia; SI, Slovenia; SK, Slovakia; UK, United Kingdom. Top Inset represent sampling effort for each country: mean number of samples per site + S.E.. Number by the ISO code is the number of sites sampled. Map created with QGIS 3.4.5 (https://www.qgis.org/fr/site/).