Phototrophic Biofilm Activity and Dynamics of Diurnal Cd Cycling in a Freshwater Stream

Beck, Aaron J.; Janßen, Felix; Polerecký, Lùbos; Herlory, Olivier; Beer, Dirk de

doi:10.1021/es900069y

Cited by 26 publications

(24 citation statements)

References 32 publications

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“…Effluent concentrations in the DCMU treatment were slightly lower than in the control, likely resulting from the additional sorption sites associated with the microalgae. Photosynthetic control of the metal cycles is consistent with previous studies showing that pH variations driven by CO 2 uptake and release can regulate metal sorption in circumneutral-pH freshwater systems (e.g., Fuller and Davis 1989, Beck et al 2009). Given the controlled conditions of the current study, we can neglect influences of temperature, other metal sources, and photochemical or precipitation reactions of Fe and Mn (cf.…”

Section: Resultssupporting

confidence: 90%

“…It was shown previously (Beck et al 2009) that Cd diel variation can be explained by photosynthesisand respiration-driven pH cycles that encompass the Cd sorption edge. From the pH experiment, it seems likely that this explanation holds for the other metals as well, with pH in the biofilm columns decreasing sufficiently to mobilize Ni, but not Cu or Pb.…”

Section: Column Experiments 2: Biofilm Biomass Influence On Diel Cyclesmentioning

confidence: 95%

“…plus algal inoculum (11 mg dry wt.) was determined as described in Beck et al (2009). These solid substrates were equilibrated with 5 lM metal-spiked mineral water, and pH was adjusted to span the range pH 2-12 using 0.1 M solutions of HCl and NaOH.…”

Section: Ph Experimentsmentioning

confidence: 99%

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The influence of phototrophic benthic biofilms on Cd, Cu, Ni, and Pb transport in permeable sediments

2010

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The effect of phototrophic biofilm activity on advective transport of cadmium (Cd), copper (Cu), nickel (Ni), and lead (Pb) in sandy sediments was examined using percolated columns. Cd and Ni in the effluent exhibited clear diel cycles in biofilmcontaining columns, with concentrations at the end of dark periods exceeding those during illumination by up to 4.5-and 10-fold for Ni and Cd, respectively. Similar cycles were not observed for Pb or Cu. Breakthrough of the latter metals was greatly retarded and incomplete relative to Cd and Ni, and trends in biofilm treatments did not differ greatly from those in control columns. Inhibition of photosystem II by DCMU (3-(3,4-dichlorophenyl)-1,1-dimethylurea) proved that diel cycles of Cd and Ni were controlled by oxygenic photosynthesis, and microsensor measurements showed that metal cycles closely matched metabolic activity-driven pH variations. The sorption edge pH for the sand/biofilm substrate followed the order Ni [ Cd [ Cu [ Pb, and for Ni and Cd, was within the pH 7-10 range observed in the biofilmcontaining column. Adsorption dynamics over the light periods matched pH increases, but desorption during dark periods was incomplete and slower than the rate of change of pH. Over a diel cycle, desorption was less than adsorption, resulting in net binding of dissolved metals due to the biofilm metabolic activity. Extraction with selective reagents indicated that the adsorbed metals were readily exchangeable, and potentially bioavailable. Thus, phototrophic benthic biofilms can control the transport of some metals across the sand-water interface, and processes in this very thin surficial layer should be considered when evaluating chemical fluxes in permeable sediments.

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Section: Resultssupporting

confidence: 90%

Section: Column Experiments 2: Biofilm Biomass Influence On Diel Cyclesmentioning

confidence: 95%

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The influence of phototrophic benthic biofilms on Cd, Cu, Ni, and Pb transport in permeable sediments

2010

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“…Biofilms are not passive organisms solely responding to sediment metals; rather their metabolic processes actively alter biogeochemical cycles, which can modify metal speciation and exposure. Photosynthetic activity by biofilms increases pH and O 2 concentrations in overlying waters and surface sediments, which has been implicated in diel cycles of metals (i.e., water column metals decline during the day) observed in some contaminated systems (Beck et al, 2009;Morris et al, 2005). Oxidation of sediments can cleave metal-sulfide bonds and mobilize metals (De Jonge et al, 2012a;Simpson et al, 2012).…”

Section: Discussionmentioning

confidence: 99%

Response of stream ecosystem function and structure to sediment metal: Context-dependency and variation among endpoints

Costello

Burton

2014

Elementa: Science of the Anthropocene

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Physicochemical and ecological attributes of ecosystems (i.e., environmental context) can modify the exposure and effects of metals, which presents a challenge for ecosystem management. Furthermore, the functional and structural attributes of an ecosystem may not respond equally to metals or be uniformly responsive to environmental context. We explored how physicochemical and ecological context modified sediment metal dose-response for a suite of functional and structural measures. Two sediments with high (HB) and low (LB) acid volatile sulfide and organic carbon content (i.e., physicochemical context) were amended with copper and nickel to establish a gradient of treatments from non-toxic to potentially toxic. Sediments were deployed in each of two streams (i.e., ecological context), incubated for four weeks, and measured for sediment microbe, biofilm, and macroinvertebrate dose-response to metal. The dose-response of microbial function was affected by physicochemical context, with cotton decomposition negatively related to sediment metal only on LB sediments. The abundance of invertebrates from the orders Ephemeroptera, Plecoptera, and Trichoptera (EPT) responded negatively to sediment metal only on LB sediments; however, this dose-response was only observed in one stream, likely because of greater abundance of sensitive EPT taxa (i.e., Baetidae and Ephemerellidae). Biofilm structure was negatively affected by sediment metal in only one stream and there was no difference in dose-response between the two sediment types. Biofilm function was affected by sediment type and stream; production by biofilms exposed to HB sediment was negatively related to sediment metal in only one stream. In all, the majority of our endpoints exhibited responses that were modified by environmental context; however, each component of the ecosystem exhibited unique context dependency. For management of sediment metals, an understanding of context dependency is useful for informed decision-making, but the application of simple contextual filters are unlikely to protect all elements of an ecosystem.

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“…Thus far, these data have been mostly acquired during limited periods of time such as single storm events or a day (Beck et al, 2009;Brick and Moore, 1996;Chapman et al, 1997;Gammons et al, 2007;Kurz et al, 2013;Liu et al, 2008;Morel et al, 2009;de Montety et al, 2011;Neal et al, 2002;Nimick et al, 2011Nimick et al, , 2005Takagi, 2015;Tercier-Weaber et al, 2009). Although these studies clearly highlighted the wealth of information provided by sampling rivers at sub-hourly frequency, they underestimate the legacy of past hydrological episodes (Kirchner, 2006;Jasechko et al, 2016;Rode et al, 2016) and are of limited use when mass budgets are to be calculated for a typical hydrological cycle.…”

Section: P Floury Et Al: the Potamochemical Symphonymentioning

confidence: 99%

The potamochemical symphony: new progress in the high-frequency acquisition of stream chemical data

Floury¹,

Gaillardet²,

Gayer³

et al. 2017

Hydrol. Earth Syst. Sci.

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Abstract. Our understanding of hydrological and chemical processes at the catchment scale is limited by our capacity to record the full breadth of the information carried by river chemistry, both in terms of sampling frequency and precision. Here, we present a proof-of-concept study of a "lab in the field" called the "River Lab" (RL), based on the idea of permanently installing a suite of laboratory instruments in the field next to a river. Housed in a small shed, this set of instruments performs analyses at a frequency of one every 40 min for major dissolved species (Na + , K + , Mg 2+ , Ca 2+ , Cl − , SO 2− 4 , NO − 3 ) through continuous sampling and filtration of the river water using automated ion chromatographs. The RL was deployed in the Orgeval Critical Zone Observatory, France for over a year of continuous analyses. Results show that the RL is able to capture long-term fine chemical variations with no drift and a precision significantly better than conventionally achieved in the laboratory (up to ±0.5 % for all major species for over a day and up to 1.7 % over 2 months). The RL is able to capture the abrupt changes in dissolved species concentrations during a typical 6-day rain event, as well as daily oscillations during a hydrological low-flow period of summer drought. Using the measured signals as a benchmark, we numerically assess the effects of a lower sampling frequency (typical of conventional field sampling campaigns) and of a lower precision (typically reached in the laboratory) on the hydrochemical signal. The highresolution, high-precision measurements made possible by the RL open new perspectives for understanding critical zone hydro-bio-geochemical cycles. Finally, the RL also offers a solution for management agencies to monitor water quality in quasi-real time.

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Phototrophic Biofilm Activity and Dynamics of Diurnal Cd Cycling in a Freshwater Stream

Cited by 26 publications

References 32 publications

The influence of phototrophic benthic biofilms on Cd, Cu, Ni, and Pb transport in permeable sediments

The influence of phototrophic benthic biofilms on Cd, Cu, Ni, and Pb transport in permeable sediments

Response of stream ecosystem function and structure to sediment metal: Context-dependency and variation among endpoints

The potamochemical symphony: new progress in the high-frequency acquisition of stream chemical data

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