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Réponse des diatomées aux nutriments : Élaboration d'un nouveau référentiel autoécologique et de métriques de diagnostic d'altération pour la flore diatomique de France métropolitaine. Rapport Final (V0)

Abstract : The Biological Diatom Index (BDI) is routinely used in water quality surveillance networks to evaluate ecological quality of French rivers. It allows measuring ecological status, as well as general degree of alteration caused by anthropogenic impacts, but is still perfectible for particular alterations that the WFD asks to evaluate for operational diagnosis and for environmental restoration. Recent work compiling most up-to-date life history traits references led to a first version of a diagnostic tool for benthic diatoms, similar to the one created for benthic invertebrates. However, this study was based on phytocenotic indices (such as BDI) that allow a general evaluation of water ecological status, but also show weak responses to particular types of pollutions, such as nitrate-dominated agricultural pollutions. It was also based, among others, on an ordinal autoecological classification developed by van Dam et al. more than 20 years ago in a radically different biogeographical context (the Netherlands). However, many studies recently showed that applying in a particular region an autoecological system that was developed elsewhere usually leads to unsatisfactory results. Diatom taxa autoecological indicator values estimated on the exclusive basis of French surveys seems to be an interesting approach for the elaboration of new diagnostic metrics. Consequently, an autoecological classification similar to van Dam et al. has been elaborated, indicating ecological affinity of 809 diatom taxa to 7 physico-chemical parameters. The end of this work consisted in using the autoecological attributes previously defined for the production of diagnostic metrics, more specifically related to different nutrient enrichment categories. Specific attention was given to the diagnosis of nitrate pollution.
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https://hal.inrae.fr/hal-02609492
Contributor : Migration Irstea Publications <>
Submitted on : Saturday, May 16, 2020 - 5:57:23 PM
Last modification on : Tuesday, September 7, 2021 - 3:54:10 PM

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  • HAL Id : hal-02609492, version 1
  • IRSTEA : PUB00061711

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D. Carayon, François Delmas. Réponse des diatomées aux nutriments : Élaboration d'un nouveau référentiel autoécologique et de métriques de diagnostic d'altération pour la flore diatomique de France métropolitaine. Rapport Final (V0). [Rapport de recherche] irstea. 2019, pp.80. ⟨hal-02609492⟩

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