2023 Early Hearing Detection & Intervention Conference

March 5-7, 2023 • Cincinnati, OH

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6/05/2017 | 9:45 AM - 10:00 AM | CONTROLLING THE EXPORT OF URBAN PHOSPHORUS: DO STORMWATER MANAGEMENT PONDS RETAIN DISSOLVED ORGANIC PHOSPHORUS? | 302A

CONTROLLING THE EXPORT OF URBAN PHOSPHORUS: DO STORMWATER MANAGEMENT PONDS RETAIN DISSOLVED ORGANIC PHOSPHORUS?

Urban stormwater ponds are commonly used for mitigating non-point source phosphorus (P) loading into aquatic ecosystems. While stormwater ponds are often designed to reduce export of particulate P through sedimentation, their ability to retain other forms of P such as dissolved organic P (DOP) remains largely unassessed. To this end, we characterized sediment and water P fractions in 6 stormwater ponds in southern Ontario, examined soluble reactive P (SRP) and DOP sediment fluxes, and compared their effects on in situ algal production and P-uptake. Sediment P was mostly bound to inorganic calcium and organic P fractions. Water column P was largely in dissolved forms, consisting mostly of DOP in the form of phosphodiesters. Sediment SRP fluxes increased sharply under low oxygen whereas DOP fluxes were relatively steady regardless of oxygen conditions. While SRP and DOP additions did not strongly affect algal production in several ponds, SRP was more readily incorporated into algal biomass. Our results help to explain high DOP concentrations in urban stormwater ponds and indicate that this P fraction is likely to be poorly retained in these systems.

C08 Urban Ecology
C27 Landuse and Non-Point source Impacts
S02 Urban streams, aquatic ecology, and stormwater engineering: How do we encourage integration, opportunities and collaboration in an era of green infrastructure innovation?

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Presenters/Authors

Clay Prater (), Trent University, prater.clay@gmail.com;