Effects of flow intermittency and pharmaceutical exposure on the structure and metabolism of stream biofilms

Corcoll, Natàlia; Casellas, Dolors Vidal; Huerta, Belinda; Guasch, Helena; Acuña, Vicenç; Rodríguez-Mozaz, Sara; Serra-Compte, Albert; Barceló, Damià; Sabater, Sergi

doi:10.1016/j.scitotenv.2014.06.093

Cited by 80 publications

(44 citation statements)

References 63 publications

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“…Although the combined effects of drought events and toxicants on aquatic microbial communities are still largely unknown, recent studies have evidenced that drought episodes can influence benthic microorganism response to toxicants (Corcoll et al, 2015 andProia et al, 2013). As recently observed by Corcoll et al (2015), the modulation of toxicant effects by drought events differs according to microbial compartment targeted. The authors observed that bacterial and algal communities in biofilms became, respectively, less and more sensitive to pharmaceutical compounds when subjected to flow intermittency.…”

Section: Effects Of Combined Stressors On Microbial Leaf Litter Decommentioning

confidence: 92%

“…Previous studies focusing on a comparable multiple stress case (i.e., hydrological disturbance and toxicants) have investigated periphytic biofilm (Corcoll et al, 2015 andProia et al, 2013) or zooplankton (Stampfli et al, 2013) communities. To our knowledge, this is the first study to focus on microbial communities associated with decomposing leaves.…”

Section: Effects Of Combined Stressors On Microbial Leaf Litter Decommentioning

confidence: 99%

“…Hydrological disturbances, particularly drying stress, encompass multiple stresses including a physiological stress, by impeding resource acquisition through the limitation of substrate and nutrient diffusion, combined with osmotic stress when water potential declines (Schimel et al, 2007). Although the combined effects of drought events and toxicants on aquatic microbial communities are still largely unknown, recent studies have evidenced that drought episodes can influence benthic microorganism response to toxicants (Corcoll et al, 2015 andProia et al, 2013). As recently observed by Corcoll et al (2015), the modulation of toxicant effects by drought events differs according to microbial compartment targeted.…”

Section: Effects Of Combined Stressors On Microbial Leaf Litter Decommentioning

confidence: 99%

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Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

et al. 2016

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Highlights• The combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition (LLD) were assessed.• TBZ applied alone had no significant effect on LLD.• Drought strongly impacted the microbial LLD process and led to cascading effects on Gammarus feeding.• Structural and functional effects increased when drought and TBZ were applied simultaneously. AbstractLoss of biodiversity and altered ecosystem functioning are driven by the cumulative effects of multiple natural and anthropogenic stressors affecting both quantity and quality of water resources. Here we performed a 40-day laboratory microcosm experiment to assess the individual and combined effects of drought and the model fungicide tebuconazole (TBZ) on leaf litter decomposition (LLD), a fundamental biogeochemical process in freshwater ecosystems. Starting out from a worst-case scenario perspective, leaf-associated microbial communities were exposed to severe drought conditions (four 5-day drought periods alternated with 4-day immersion periods) and/or a chronic exposure to TBZ (nominal concentration of 20 µg L−1). We assessed the direct effects of drought and fungicide on the structure (biomass, diversity) and activity (extracellular enzymatic potential) of fungal and bacterial assemblages colonizing leaves. We also investigated indirect effects on the feeding rates of the amphipod Gammarus fossarum on leaves previously exposed to drought and/or TBZ contamination. Results indicate a stronger effect of drought stress than fungicide contamination under the experimental conditions applied. Indeed, the drought stress strongly impacted microbial community structure and activities, inhibiting the LLD process and leading to cascading effects on macroinvertebrate feeding. However, despite the lack of significant effect of TBZ applied alone, the effects of drought on microbial functions (i.e., decrease in LLD and in enzymatic activities) and on Gammarus feeding rates were more pronounced when drought and TBZ stresses were applied together. In a perspective of ecological risk assessment and ecosystem management for sustainability, these findings stress the need for deeper insight into how multiple stressors can affect the functioning of aquatic ecosystems and associated services.

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Section: Effects Of Combined Stressors On Microbial Leaf Litter Decommentioning

confidence: 92%

Section: Effects Of Combined Stressors On Microbial Leaf Litter Decommentioning

confidence: 99%

Section: Effects Of Combined Stressors On Microbial Leaf Litter Decommentioning

confidence: 99%

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Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

et al. 2016

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“…Biofilms can be used as warning systems for the detection of the effects of toxicants on aquatic systems due to the sensitivity and integration of a large diversity of physiological responses of the species constituting the biofilm (Sabater et al, 2007;Lear et al, 2012;Burns and Ryder, 2001). Several studies have highlighted biofilm sensitivity to a large panel of toxicants, such as metals (e.g., Serra et al, 2010;Corcoll et al, 2011;Bonet et al, 2012), herbicides (Guasch et al, 2003;Pesce et al, 2008), and pharmaceuticals (Proia et al, 2011(Proia et al, , 2013Corcoll et al, 2014). The effects of arsenic on biofilm communities and the role of biofilm in the adsorption, uptake and/or transformation of arsenic have been recently investigated (Rodriguez Castro et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Arsenic toxicity effects on microbial communities and nutrient cycling in indoor experimental channels mimicking a fluvial system

2015

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“…The F 0 is the basal fluorescence of the algal component of the biofilm and can be used as an in vivo estimate of algal biomass (Schmitt‐Jansen & Altenburger, ). This variable allows the evaluation of the algal response to environmental stressors (Corcoll et al., ). The F 0 was estimated for several ( n = 5) sediment spots with a portable pulse amplitude modulate fluorometer (Diving‐PAM; WALZ, Effeltrich, Germany), and the averaged value was provided as the F 0 of the channel.…”

Section: Methodsmentioning

confidence: 99%

Does the severity of non‐flow periods influence ecosystem structure and function of temporary streams? A mesocosm study

et al. 2018

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Global change is dramatically altering flow regimes worldwide. Among the most important consequences are the transition of many permanent waterways to temporary waterways, the increase in duration and frequency of non‐flow periods of temporary streams, and the increase in the severity (i.e. irradiance, temperature and humidity) of the non‐flow period. Nowadays, there is a lack of knowledge on how changes in duration, frequency and severity of the non‐flow period will reflect on biodiversity and biogeochemical changes in temporary streams. We designed a manipulative experiment using artificial streams to evaluate the effects of severity of the non‐flow period on stream biofilms. Sixteen artificial streams were assigned to four treatments: continuous flow, continuous intermittency and intermittency with and without rain events. Effects were assessed on selected features of stream biofilm structure (i.e. bacterial density and basal fluorescence) and function (photosynthetic efficiency and enzymatic activities), as well as CO2 emissions and dissolved organic matter quantity and quality from water column and sediments. The occurrence of rain events during the non‐flow period enhanced organic carbon processing and CO2 emissions to the atmosphere, reducing the sediment reservoir of exportable organic carbon and therefore reducing the dissolved organic carbon exports from streambeds at flow resumption. Given the ongoing reducing trends in the frequency of rain events in semi‐arid and arid regions, we expect temporary streams to process and emit less and to export more carbon to downstream systems.

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Effects of flow intermittency and pharmaceutical exposure on the structure and metabolism of stream biofilms

Cited by 80 publications

References 63 publications

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

Combined effects of drought and the fungicide tebuconazole on aquatic leaf litter decomposition

Arsenic toxicity effects on microbial communities and nutrient cycling in indoor experimental channels mimicking a fluvial system

Does the severity of non‐flow periods influence ecosystem structure and function of temporary streams? A mesocosm study

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