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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. 2 — Abundance of amphipod species in 13 tributary streams of Lake Constance in 2012 (a) and 2013 (b). Abundance (log[n + 1]) 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