Summary characteristics of environmental variables. Mean values with range (in the brackets) are displayed. Asterisks in the column “M–W test” indicate significant result of Mann–Whitney U test for comparison of variables (*p < 0.05, **p < 0.01, ***p < 0.001, ns = non-significant difference, x = categorical variable). Mann–Whitney U test was not applied for categorical variables banks, bioregion and connectivity variables.
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