HeLM: a macrophyte-based method for monitoring and assessment of Greek lakes.

For the evaluation of effectiveness of the method, the correlations between individual metrics and final HeLM values and common pressure indicators, such as total phosphorus, chlorophyll a and Secchi depth, were tested and found highly significant and relatively strong.

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In all three cases, a clear trend was observed of elodeid-dominated macrophytic communities at high ecological status lakes being replaced by helophyte-dominated macrophytic communities at lakes of lower ecological status classes.

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