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CB-GIG 1st Intercalibration Exercise: French situation concerning diatom bio-indication in rivers

Abstract : The present meeting, set up at the request of the 2 co-coordinators of the 1st CB-GIG Intercalibration Exercise, John Murray-Blight and Roger Owen, has been organized by the Estonian University of Tartu, ES. Being the 1st Intercalibration meeting organized by the CB-GIG in application of the WFD, the national Experts of a biological element were asked : to present their national evaluation system; 2) to make the state of the national data available for the exercise ; 3) to inform the other participants, if necessary, about specificities encountered in their own country, that should require a collective methodological discussion. These presentations are done in separate worshops regrouping specialists of the same biological quality element (aquatic macrophytes, phytobenthos, macroinvertebrates...). The last day, depending on the biological element and on the data characteristics available per biological element, methodological options for doing tjhe most adequate intercalibration have to be discussed during 2 plenary sessions. In this general context, Cemagref's presentation first described the 2 national diatom indexes (IPS, IBD) and their principles of construction, then different existing tools allowing to stock the diatom inventories and to calculate the index values. No WFD-compliant assessment system being already officialized at our national level, a prototype of assessment system based on IPS on the one hand, on IBD on the other hand, has been presented. IPS is already known to perform a little better, but is based on a infinite list of taxa. It is then very difficult to normalize and to apply by private consultants. So, France will probably decide later on to use IBD for the national application of WFD.
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Contributor : Migration Irstea Publications <>
Submitted on : Saturday, May 16, 2020 - 7:39:01 PM
Last modification on : Thursday, June 3, 2021 - 5:34:03 PM


  • HAL Id : hal-02610333, version 1
  • IRSTEA : PUB00064459



François Delmas, Michel Coste. CB-GIG 1st Intercalibration Exercise: French situation concerning diatom bio-indication in rivers. CB-GIG 1st Rivers Experts Meeting, Jun 2005, Tallin, Netherlands. pp.36. ⟨hal-02610333⟩



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