Evidence for Microbial Community Effect on Sediment Equilibrium Phosphorus Concentration (EPC 0 )
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Evidence for Microbial Community Effect on Sediment Equilibrium Phosphorus Concentration (EPC0) Alicia M. DiCarlo1 · Chris. G. Weisener1 · Ken. G. Drouillard1 Received: 14 July 2020 / Accepted: 6 October 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Batch equilibrium phosphorus concentration (EPC0) methods were applied to determine phosphorus capacity of sediments from three agriculturally influenced tributaries in southern Ontario – Belle River, Big Creek, and Nissouri Creek. Aliquots of sediments were amended with soluble reactive phosphorus and incubated at four temperatures (5, 15, 25, and 35°C). Batches of sediments from each location and temperature were also subjected to a treatment; gamma (γ)-irradiated at 28 kGy over 24-h (sterilized) and compared to non-sterilized biotic samples. Treatment showed a significant effect on EPC0 in Belle River and Nissouri Creek but non-significant effect in Big Creek. Temperature showed a significant effect in Belle River, Nissouri Creek, and the biotic subset of Big Creek. While direction of shift was not consistent in all cases, the biotic subsets of all three locations showed a significant effect of temperature. Keywords Equilibrium phosphorus concentration · Nutrients · Microbial communities · Sediments · Sterilization Phosphorus (P) is an important nutrient to primary producers in aquatic environments, and contributes to eutrophication and harmful algal blooms in receiving lakes when added in excess (Pant and Reddy 2001; Lucci et al. 2010; Cooper et al. 2015; Emelko et al. 2016). For agricultural streams, a major source of P is from soil loss and fertilizer applications collectively, referred to as non-point sources (Pant and Reddy 2001; Lucci et al. 2010). Once P enters water it can settle as particulate forms, be carried downstream in solubilized form and/or undergo several biogeochemical reactions that further alter its fate, mobility, and sequestration in the environment (Sharpley et al. 2007). The dynamic interaction of P in its various forms between sediments and soluble reactive phosphorus (SRP) in overlying water is referred to as the P buffering system (Novak et al. 2004; Weigelhofer et al. 2018). The P buffering system is directly related to the sorption and desorption capacity of Electronic supplementary material The online version of this article (https://doi.org/10.1007/s00128-020-03019-0) contains supplementary material, which is available to authorized users. * Alicia M. DiCarlo [email protected] 1
Great Lakes Institute for Environmental Research (GLIER), University of Windsor, 401 Sunset Ave, Windsor, ON N9B3P4, Canada
sediments for SRP and has historically been considered to be influenced by geochemical and physical characteristics of the sediments (Novak et al. 2004; Emelko et al. 2016; Weigelhofer et al. 2018). However, the role that microbial organisms play in mediating sediment sorption capacity and the sediment buffering system is not fully established (Gibbons et al. 2014). A common tool for
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