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Age matters : submersion period shapes community composition of lake biofilms under glyphosate stress

Khadra Melissa, Planas Dolors, Girard Catherine et Amyot Marc. (2018). Age matters : submersion period shapes community composition of lake biofilms under glyphosate stress. FACETS, 3, (1), p. 934-951.

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The phosphonate herbicide glyphosate, which is the active ingredient in the commercial formulation Roundup®, is currently the most globally used herbicide. In aquatic ecosystems, periphytic biofilms, or periphyton, are at the base of food webs and are often the first communities to be in direct contact with runoff. Microcosm experiments were conducted to assess the effects of a pulse exposure of glyphosate on community composition and chlorophyll a concentrations of lake biofilms at different colonization stages (2 months, 1 year, and 20 years). This is the first study that uses such contrasting submersion periods. Biofilms were exposed to either environmental levels of pure analytical grade glyphosate (6 μg/L, 65 μg/L, and 600 μg/L) or to corresponding phosphorus concentrations. Community composition was determined by deep sequencing of the 18S and 16S rRNA genes to target eukaryotes and cyanobacteria, respectively. The results showed that submersion period was the only significant contributor to community structure. However, at the taxon level, the potentially toxic genus Anabaena was found to increase in relative abundance. We also observed that glyphosate releases phosphorus into the surrounding water, but not in a bioavailable form. The results of this study indicate that environmental concentrations of glyphosate do not seem to impact the community composition or metabolism of lake biofilms under pulse event conditions.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 934-951
Version évaluée par les pairs:Oui
Date:Octobre 2018
Identifiant unique:10.1139/facets-2018-0019
Sujets:Sciences naturelles et génie > Sciences appliquées > Eau et environnement
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Sciences naturelles et génie > Sciences naturelles > Chimie
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:lake biofilms, glyphosate, cyanobacteria, submersion period, community composition, biofilms lacustres, cyanobactérie, période de submersion, composition des communautés
Déposé le:26 juill. 2021 15:21
Dernière modification:26 juill. 2021 15:21
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