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Sound and independent information
on the environment

You are here: Home / Data and maps / Indicators / Biological quality of lakes

Biological quality of lakes

Topics: , ,

Assessment made on  01 May 2004

Generic metadata

Classification

Water Water (Primary theme)

Coasts and seas Coasts and seas

DPSIR: State

Identification

Indicator codes
  • WEC 005
Geographical coverage:

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Contents
 

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

Key messages

  • Many European lakes are heavily impacted by eutrophication, indicated by a high proportion of cyanobacteria in the phytoplankton communities. The situation is worst in densely populated countries.

Figures

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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European Environment Agency (EEA)
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Phone: +45 3336 7100