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Title: Mobility and bioavailability of sediment phosphorus in urban stormwater ponds
Authors: Frost, Paul C.
Prater, Clay
Scott, Andrew B.
Song, Keunyea
Xenopoulos, Marguerite A.
Keywords: Dissolved organic phosphorus
Stormwater management ponds
Sediments,
Phosphorus uptake
Retention efficiency
Urban ecosystems
Issue Date: 1-Jan-2019
Publisher: © American Geophysical Union. Published by Wiley
Citation: FROST, P.C. .... et al., 2019. Mobility and bioavailability of sediment phosphorus in urban stormwater ponds. Water Resources Research, Doi: 10.1029/2018WR023419
Abstract: © 2019. American Geophysical Union. All Rights Reserved. Stormwater ponds can serve as retention hotspots for phosphorus (P) moving out of the urban environment. This retention may be reduced by P speciation that reduces the bioavailability of P to primary producers and alters its mobility in sediments. Here we examined the mobility and fate of dissolved P in urban stormwater ponds with a set of complementary field measurements and short-term laboratory and field experiments. We measured the types and amount of P in water column and sediments of urban stormwater ponds. We further assessed the mobility of different P types in pond sediments in the field and rates of P release from sediment cores maintained under laboratory conditions. Finally, we assessed P uptake rates by pond algal communities using short-term bioassay experiments. We found that dissolved organic P was highly prevalent in urban pond water and sediments and that this type of P was mobile within sediments and could be released under high or low O 2 conditions. We also found highly variable P demand by algae among stormwater ponds and that algal growth responses to P was correlated to water column N:P ratios. Altogether, our results indicate an important role for organic phosphorus cycling in urban stormwater ponds, which likely constrains the overall retention efficiency in these aquatic ecosystems.
Description: This paper is in closed access until 18th October 2019
Sponsor: This research was funded, in part, by Environment and Climate Change Canada through the Lake Simcoe Clean-up Fund.
Version: Published
DOI: 10.1029/2018WR023419
URI: https://dspace.lboro.ac.uk/2134/37898
Publisher Link: https://doi.org/10.1029/2018WR023419
ISSN: 0043-1397
Appears in Collections:Closed Access (Geography and Environment)

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