The sensitivity of aquatic microbial communities to a complex agricultural contaminant depends on previous drought conditions

Courcoul, Camille; Leflaive, Joséphine; Ferriol, Jessica; Boulêtreau, Stéphanie

doi:10.1016/j.watres.2022.118396

Cited by 7 publications

(7 citation statements)

References 58 publications

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“…As suggested in those studies, the run-off of dead cell debris (mostly from algal origin) in our biofilms could have been fuelling carbon and nutrients to bacteria and helping them to resist during droughts. In addition, our experiment show that green algae seem to be more resistant compared to cyanobacteria and diatoms to droughts as observed in other studies (i. e., Zlatanović et al 2018;Courcoul et al 2022).…”

Section: Biofilm Responses To Droughtssupporting

confidence: 87%

“…Indeed, it has been demonstrated that aquatic microbial heterotrophic communities exposed to long drought showed higher xerotolerance, characterised by higher resistance and resilience to droughts, than autotrophic communities developed under the same treatments (Acuña et al 2015). Bacterial density and cell viability did not decrease in our experiment as observed in other experiments (i. e., Timoner et al 2012 andCourcoul et al 2022). As suggested in those studies, the run-off of dead cell debris (mostly from algal origin) in our biofilms could have been fuelling carbon and nutrients to bacteria and helping them to resist during droughts.…”

Section: Biofilm Responses To Droughtssupporting

confidence: 67%

“…Hydrological variations due to climate change and/or anthropic activities (i. e., irrigation or hydropeaking) can cause different frequencies and durations of drought events in streams. Hydrological variations caused by hydropeaking, generating short and frequent droughts (daily frequency, Li and Pasternack 2021), and by agricultural practices, generating longer and less frequent droughts (weekly frequency, Courcoul et al 2022), are those mainly affecting rivers and streams in south-western Europe. Hydrological changes (i. e., drought episodes and high flow events) have been shown to be one of the most relevant stressors to biofilm structure and function (Romero et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Dissipation of pesticides by stream biofilms is influenced by hydrological histories

Bertrans-Tubau,

Menard,

Batisson

et al. 2023

FEMS Microbiology Ecology

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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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Section: Biofilm Responses To Droughtssupporting

confidence: 87%

Section: Biofilm Responses To Droughtssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dissipation of pesticides by stream biofilms is influenced by hydrological histories

Bertrans-Tubau,

Menard,

Batisson

et al. 2023

FEMS Microbiology Ecology

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“…Phosphorus quantification was performed using a spectrophotometer at 880 nm (Uvi Light XT5; SECOCAM), after a pre‐treatment as described in Courcoul et al. (2022).…”

Section: Methodsmentioning

confidence: 99%

“…Nitrogen and C contents were quantified using a CHN analyser (Flash 2000; Thermo Scientific). Phosphorus quantification was performed using a spectrophotometer at 880 nm (Uvi Light XT5; SECOCAM), after a pre-treatment as described in Courcoul et al (2022).…”

Section: Stoichiometric Compositionmentioning

confidence: 99%

Flow intermittency affects the nutritional quality of phototrophic biofilms and their capacity to support secondary production

Courcoul,

Boulêtreau,

Bec

et al. 2023

Freshwater Biology

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In streams, phototrophic biofilms are considered to be a good‐quality resource for consumers and are essential to support secondary production. However, with the increasing occurrence of flow intermittency as a consequence of global climate change, limited information exists regarding the impact of drying and rewetting events on biofilm nutritional quality indicators and their consequences for consumers. This study aims at understanding how river intermittency affects the nutritional quality of phototrophic biofilms. Specifically, we examine the effects of drying and rewetting events on their capacity to support secondary production. Our hypothesis was that the capacity of biofilms to support secondary production relies on their nutritional quality: biofilms characterised by higher contents of long‐chain fatty acids, nitrogen and phosphorus are expected to provide a better‐quality resource for consumers. We also hypothesised that the nutritional quality of biofilms undergoes changes over time during drying events, and that these changes are influenced by their initial algal composition. This is because the algal composition within biofilms may shift in response to drying events, subsequently impacting the nutritional quality of the biofilms. We grew four phototrophic biofilms in flowing water, each with a different nutritional quality, and then exposed them to a short (3 days) or a long dry period (14 days). Biofilms were sampled 3 days and 18 days after rewetting (post‐disturbance and post‐recovery) to assess alterations in nutritional indicators relative to their pre‐disturbance state through pigment, fatty acid and stoichiometric analyses. We fed these biofilms to Gammarids (Gammarus fossarum) for 29 days and measured individual growth, feeding rate and locomotor activity. We also calculated a secondary production index to assess the biofilms' capacity to support higher trophic levels. Our findings revealed that the nutritional quality of biofilms was significantly reduced during the post‐disturbance phase. The duration of the dry period had minimal effect on this decline. Subsequently, during the recovery phase, nutritional quality indicators improved for biofilms initially dominated by cyanobacteria, while they either remained unchanged or decreased for biofilms initially dominated by diatoms, in comparison to the pre‐disturbance state. As a result, biofilms that initially exhibited a high nutritional quality were disrupted by the dry period, depending on the duration. However, the overall effects of dry period on gammarid's response and on secondary production were less pronounced, which is likely to have resulted from changes in the quantity of available resources. Our study demonstrates that a disturbance can modify the expected and effective qualities of biofilms. It highlights that biochemical parameters cannot reliably predict biofilm capacity to support secondary production. Biofilm history of disturbance, among other parameters, must be taken into account.

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Spatiotemporal evolution characteristics and influencing factors of the crop water use efficiency in watersheds based on the water footprint

Yang,

Gao

2024

Environ Monit Assess

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The sensitivity of aquatic microbial communities to a complex agricultural contaminant depends on previous drought conditions

Cited by 7 publications

References 58 publications

Dissipation of pesticides by stream biofilms is influenced by hydrological histories

Dissipation of pesticides by stream biofilms is influenced by hydrological histories

Flow intermittency affects the nutritional quality of phototrophic biofilms and their capacity to support secondary production

Spatiotemporal evolution characteristics and influencing factors of the crop water use efficiency in watersheds based on the water footprint

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