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Communication Dans Un Congrès Année : 2013

Multi index assessment of streams and associated uncertainties: application to macrophytes

Résumé

The European Water Framework Directive (2000) imposed chemical and biological assessments in streams. If studies of chemistry uncertainties exist for a long time, few similar studies are still recent in hydrobiology. Our aim is to study impacts of uncertainties - understood as any action that may cause a data error - on biotic metrics (diversity, abundance), biotic index and final assessment. We focus on the French index: IBMR (Indice Biologique des Macrophytes de Rivière, AFNOR, 2004) based on the macrophyte compartment. From literature, among the sources of uncertainties it appears that the operator factor had the least influence, the seasonal variation and shading had a slightly stronger effect. And the habitat change had the major impact. We chose to analyse uncertainties based on the operator effect both on field and in laboratory such as taxa omissions, identification errors and abundance changes. To study the uncertainties propagation on the IBMR, we will use reliable floristic sheets which will be artificially modified. Firstly a matrix of identification errors will be created with confusion score between taxa. Secondly, a selection module using this matrix will complete a random exchange without human bias. Thus the creation of new erroneous floristic sheets will allow us to measure the deviation from the reference.
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Dates et versions

hal-00880297 , version 1 (05-11-2013)

Identifiants

  • HAL Id : hal-00880297 , version 1

Citer

Juliane Wiederkehr, Mickaël Fabrègue, Bruno Fontan, Corinne Grac, Frédéric Labat, et al.. Multi index assessment of streams and associated uncertainties: application to macrophytes. 8th Symposium for European Freshwater Sciences, Jul 2013, Münster, Germany. ⟨hal-00880297⟩
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