AI Article Synopsis
- A microcosm study was conducted to assess how different drought conditions affect the ability of stream biofilms to break down a mixture of pesticides, including tebuconazole and glyphosate.
- The biofilms were tested under three conditions: short frequent droughts, long infrequent droughts, and continuously submerged environments, while various structural and functional measures of the biofilms were taken.
- Results indicated that biofilms experiencing short and frequent droughts had higher pesticide dissipation rates, showing their ability to absorb hydrophobic pesticides even when stressed from drought conditions.
Article 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.
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| http://dx.doi.org/10.1093/femsec/fiad083 | DOI Listing |
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