Biological quality of lakes

Indicator Fact Sheet
Prod-ID: IND-256-en
Also known as: WEC 005
This page was archived on 07 May 2015 with reason: No more updates will be done

Assessment made on  01 May 2004

Generic metadata



DPSIR: State


Indicator codes
  • WEC 005

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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