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L'IPLAC : un indice phytoplancton, DCE compatible, pour les plans d’eau en France

Abstract : The Water Framework Directive (WFD, 2000) requires Member States to assess the ecological status of water bodies, including lakes, using biological indicators. Phytoplankton is one of the relevant biological elements in water bodies to contribute to this evaluation. Irstea, under the partnership agreement with ONEMA, was responsible for the development of a phytoplankton index compliant with the requirements of the WFD. The Phytoplankton Index of Lakes - IPLAC - is a multimetric index that should be applied to all water bodies of France concerned by the WFD. It is composed of two complementary metrics: the total Algal Biomass Metric (MBA) and the Specific Composition Metric (MCS). MBA is based on the average concentrations of chlorophyll-a observed during the vegetative period. MCS is based on a list of indicator species with a specific score and a stenoecy coefficient which have been assigned by statistical developments. To meet the criteria of the WFD, the final result of IPLAC is expressed as the Ecological Quality Ratio (EQR), varying between 0 and 1, compared to a reference condition. The IPLAC is correlated with concentrations of total phosphorus (r ² = 0.52) used as an indicator of anthropogenic pressures on water bodies. The first results of the IPLAC application in France indicate that, according to this index, nearly 64 % of water bodies can be classified in good or very good status and 14 % in poor or bad status.
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Contributor : Migration Irstea Publications <>
Submitted on : Friday, May 15, 2020 - 10:38:58 PM
Last modification on : Friday, June 12, 2020 - 4:18:34 PM


  • HAL Id : hal-02597490, version 1
  • IRSTEA : PUB00036328



Christophe Laplace-Treyture, T. Feret, M. Menay, J. de Bortoli. L'IPLAC : un indice phytoplancton, DCE compatible, pour les plans d’eau en France. Journées Internationales de Limnologie et d’Océanographie (JILO), Oct 2012, Clermont-Ferrand, France. pp.19. ⟨hal-02597490⟩



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