Dissipation of pesticides by stream biofilms is influenced by hydrological histories - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement Access content directly
Journal Articles FEMS Microbiology Ecology Year : 2023

Dissipation of pesticides by stream biofilms is influenced by hydrological histories

Abstract

Abstract To evaluate the effects of hydrological variability on pesticide dissipation capacity by stream biofilms, we conducted a microcosm study. We exposed biofilms to short and frequent droughts (daily frequency), long and less frequent droughts (weekly frequency) and permanently immersed controls, prior to test their capacities to dissipate a cocktail of pesticides composed of tebuconazole, terbuthylazine, imidacloprid, glyphosate and its metabolite aminomethylphosphonic acid. A range of structural and functional descriptors of biofilms (algal and bacterial biomass, extracellular polymeric matrix (EPS) concentration, microbial respiration, phosphorus uptake and community-level physiological profiles) were measured to assess drought effects. In addition, various parameters were measured to characterise the dynamics of pesticide dissipation by biofilms in the different hydrological treatments (% dissipation, peak asymmetry, bioconcentration factor, among others). Results showed higher pesticide dissipation rates in biofilms exposed to short and frequent droughts, despite of their lower biomass and EPS concentration, compared to biofilms in immersed controls or exposed to long and less frequent droughts. High accumulation of hydrophobic pesticides (tebuconazole and terbuthylazine) was measured in biofilms despite the short exposure time (few minutes) in our open-flow microcosm approach. This research demonstrated the stream biofilms capacity to adsorb hydrophobic pesticides even in stressed drought environments.
Fichier principal
Vignette du fichier
BertransTubauetal_researcharticle_revision_clean_copy_HAL.pdf (1.81 Mo) Télécharger le fichier
Origin Files produced by the author(s)
Licence

Dates and versions

hal-04173364 , version 1 (14-09-2023)

Licence

Identifiers

Cite

Lluís Bertrans-Tubau, Yoann Menard, Isabelle Batisson, Nicolas Creusot, Nicolas Mazzella, et al.. Dissipation of pesticides by stream biofilms is influenced by hydrological histories. FEMS Microbiology Ecology, inPress, ⟨10.1093/femsec/fiad083⟩. ⟨hal-04173364⟩
54 View
64 Download

Altmetric

Share

Gmail Mastodon Facebook X LinkedIn More