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Box-and-whisker plot showing (a) the percentage of macroalgae coverage, (b) the percentage of bryophyte coverage, (c) the percentage of elodeid coverage, (d) the percentage of nymphaeid coverage, (e) the percentage of pleustophyte coverage and (f) the percentage of helophyte coverage in the studied rivers. *An asterisk above a whisker denotes significant differences between the rivers. Abbreviations: see Figure 2.
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