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Biological quality of lakes

Indicator Fact Sheet (Deprecated)expired
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This content has been archived on 07 May 2015, reason: No more updates will be done

Assessment made on  01 May 2004

Generic metadata


Water Water (Primary theme)

Coasts and seas Coasts and seas

DPSIR: State


Indicator codes
  • WEC 005
Geographic coverage:

Policy issue:  Is good surface water ecological status being achieved?


Key assessment

Cyanobacteria are dominant in the phytoplankton community in many lakes, most conspicuously in Denmark where, until recently, many lakes have been polluted with phosphorus from sewage and industrial discharges. Norwegian lakes are less impacted by pollution, and the concentration of phytoplankton, in particular cyanobacteria, is lower. The French Lac Leman and Greek Lake Trihonida are dominated by taxa of phytoplankton other than cyanobacteria, contrary to the French reservoir Cheze / Jean Descottes with complete dominance by cyanobacteria during July and August. These 3 lakes cannot be considered representative for regions or countries.


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