Spatial patterns of genetic diversity, community composition and occurrence of native and non-native amphipods in naturally replicated tributary streams.

We found a highly significant interaction between the occurrence of native versus non-native amphipods and upstream distance ( Chi 2 value = 16.03, p value <0.0001; Fig. 1 ), reflecting that non-native species were mostly present at the outlet, while the native species were mostly present at the further upstream sites.

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