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. 2016 Apr 26;16:23. doi: 10.1186/s12898-016-0079-7

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© Altermatt et al. 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided 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 Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 3 — Percentage of sites occupied by each of the five amphipod species across the 13 tributary streams of Lake Constance in 2012 (a) and 2013 (b). Percentage of sites occupied is given for each species relative to the sampling sites’ upstream distance from lake (stream outlet). Gammarus roeseli and Dikerogammarus villosus are non-native species, while the three other species are natives