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Communication Dans Un Congrès Année : 2015

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

Utilisation des traits d'histoire de vie des diatomées benthiques pour évaluer le risque de dégradation des cours d'eau

Résumé

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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Dates et versions

hal-02601471 , version 1 (16-05-2020)

Identifiants

Citer

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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