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Fig. 3


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The habitat preference of Gammarus pulex Linnaeus, 1758, Gammarus roeselii Gervais, 1835 and Gammarus lacustris G.O. Sars, 1864 clearly shows the restriction of G. lacustris to small standing water bodies and its withdrawal from lakes. Blue: running water bodies, orange: standing water bodies, light orange: extinct occurrences.

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