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. 2020 Apr 9;10:6122. doi: 10.1038/s41598-020-62916-w

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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 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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Current distributional range of the sea lamprey in European watersheds. Watersheds where the migrating sea lamprey is reported are displayed in green and watersheds (with an area > 1000 km²) where the lamprey co-occurs with the European catfish are displayed in dark green⁴. Sea lamprey distribution map in European watersheds was established from one compilation of the available literature (including scientific reports, books, online data and grey literature). More recent publications are detailed hereafter by watershed: (1), Oder³²; (2), Wisla³²; (3), Nemunas³²; (4), Elbe³³; (5), Weser³⁴; (6), Ems³⁴; (7), Pô³⁵; (8), Rhine³³; (9), Loire (http://www.logrami.fr/actions/stations-comptage/); (10), Rhône³⁶; (11), Seine³²; (12), Dordogne (http://www.migado.fr/category/publications/); (13), Garonne (http://www.migado.fr/category/publications/); (14), Adour³³; (15), Douro¹⁹; (16), Ebre¹⁹; (17), Minho¹⁹; (18), Guadalquivir¹⁹; (19), Tajo¹⁹; (20), Guadiana¹⁹; (21), Kemijoki³⁶; (22), Glomma³⁶; (23), Umeälven³⁶; (24), Dalälven³²; (25), Skien³²; (26), Meuse³⁶. This distribution was updated for other watersheds with information from^17,37,38, and the following web sites: http://jncc.defra.gov.uk/ProtectedSites/SACselection/species.asp?FeatureIntCode=S1095; http://www.observatoire-poissons-migrateurs-bretagne.fr/lamproies; http://normandiegrandsmigrateurs.fr/les-poissons-migrateurs-de-normandie/lamproies/comptage-geniteurs-de-lamproies/. The map was generated using QGIS 2.14.0-Essen (https://www.qgis.org/en/site/).