Please use this identifier to cite or link to this item: http://hdl.handle.net/2445/127811
Title: The effects of sediment depth and oxygen concentration on the use of organic matter: An experimental study using an infiltration sediment tank
Author: Freixa Casals, Anna
Rubol, Simonetta
Carles-Brangarí, Albert
Fernàndez-Garcia, Daniel
Butturini, Andrea
Romaní i Cornet, Anna M.
Sanchez-Vila, X.
Keywords: Oxigen
Sediments (Geologia)
Enzims
Oxygen
Sediments (Geology)
Enzymes
Issue Date: 1-Jan-2016
Publisher: Elsevier B.V.
Abstract: Water flowing through hyporheic river sediments or artificial recharge facilities promotes the development of microbial communities with sediment depth. We performed an 83-day mesocosm infiltration experment, to study howmicrobial functions (e.g., extracellular enzyme activities and carbon substrate utilization) are affected by sediment depth (up to 50 cm) and different oxygen concentrations. Results indicated that surface sediment layers were mainly colonized bymicroorganisms capable of using awide range of substrates (although they preferred to degrade carbon polymeric compounds, as indicated by the higher ß-glucosidase activity). In contrast, at a depth of 50 cm, the microbial community became specialized in using fewer carbon substrates, showing decreased functional richness and diversity. At this depth, microorganisms picked nitrogenous compounds, including amino acids and carboxyl acids. After the 83-day experiment, the sediment at the bottomof the tank became anoxic, inhibiting phosphatase activity. Coexistence of aerobic and anaerobic communities, promoted by greater physicochemical heterogeneity, was also observed in deeper sediments. The presence of specific metabolic fingerprints under oxic and anoxic conditions indicated that the microbial community was adapted to use organic matter under different oxygen conditions. Overall the heterogeneity of oxygen concentrations with depth and in time would influence organic matter metabolism in the sediment tank
Note: Versió postprint del document publicat a: https://doi.org/10.1016/j.scitotenv.2015.04.007
It is part of: Science of the Total Environment, 2016, vol. 540, p. 20-31
URI: http://hdl.handle.net/2445/127811
Related resource: https://doi.org/10.1016/j.scitotenv.2015.04.007
ISSN: 0048-9697
Appears in Collections:Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)

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