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Conference papers

Using benthic diatom life-history traits to assess stream impairment risk

Abstract : Benthic diatoms are widely used over the world to assess the quality of freshwater ecosystems. Their taxonomic diversity, life-history trait variety and ability to respond fastly to water quality degradation make them efficient ecological indicators. Even if diatom-based biotic indices are valuable tools in detecting the degradation/restoration of aquatic ecosystems, they do not clearly help to identify the nature of pressure(s) impairing in situ communities. In this context, we aimed at developing a diatom trait based tool that helps to estimate the probability that a specific pressure significantly impairs local communities. autecological information on various traits (biovolumes, life forms…) was gathered from literature and expert advices for species caught in > 1500 sampling sites of the French RCS national river survey. Most of this information was fuzzy-coded to take into account within-species variation in life-history characteristics. The responses of metrics were assessed for several pressure categories related to water chemistry (e.g. herbicides, acidification) and habitat degradation, in an ecoregional framework. For each pressure category a Condition Tree Forest model was built using the risk level as the response variable and the trait-based metrics as the predictive variables. This work contributes to the development of a multi biological-quality-element based diagnostic tool.
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Conference papers
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Contributor : Migration Irstea Publications <>
Submitted on : Saturday, May 16, 2020 - 6:43:17 AM
Last modification on : Tuesday, September 7, 2021 - 3:54:09 PM


  • HAL Id : hal-02601471, version 1
  • IRSTEA : PUB00044559



Floriane Larras, E. Gautreau, Elise Billoir, Soizic Morin, Juliette Tison-Rosebery, et al.. Using benthic diatom life-history traits to assess stream impairment risk. 9th Symposium for European Freshwater Sciences (SEFS), Jul 2015, Genève, Switzerland. ⟨hal-02601471⟩



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