Abstract
Stormwater Ponds (SPs) are common throughout urbanizing environments, yet their ecological role has not been well established. SPs are primarily designed for hydrological control of stormwater, but many are also designed to attenuate the quality of runoff prior to discharge. Thus, SPs likely serve as an important land-water linkage between terrestrial and aquatic systems in urban areas. In this study, we characterized 22 SPs and 3 natural reference ponds from Durham Region, Ontario, Canada representing a gradient in emergent plant cover. There was high variability and wide ranges in water quality parameters among SPs. The percentage of impervious surface served as a measure of urbanization intensity, and was a significant driver of conductivity, chloride and total suspended solids regardless of emergent vegetation cover. In fact, only water temperature (r = −0.61) was found to significantly correlate with vegetation cover. This suggests a minimal role for emergent vegetation in mediating SP water quality. SPs had notably higher conductivity and runoff-metals (Cu, Zn, Pb, and Cr) than reference ponds, but nutrients (Total P and Total N) and algal biomass did not significantly differ between SPs and reference ponds. Dominant phytoplankton groups included blue-green and euglenid algae, both of which are indicators of eutrophic and high organic systems, respectively. The blue-green genus Microcystis was detected in all ponds, and was the dominant taxon in most SPs. This raises concern that SPs may serve as reservoirs of toxin-producing algae. Multivariate analyses of metals, water quality variables and algal species composition showed considerable dissimilarity among SPs, yet comparably high similarity among reference ponds. This indicates that SPs are dynamic and diverse systems despite their engineered origins. Such broad gradients in water quality characteristics also imply variable impacts to receiving waters in the same region.
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Acknowledgements
This work was supported by a Natural Science and Engineering Research Council (NSERC) grant to A. Kirkwood. The authors wish to thank C. Phinney for assistance in the field and laboratory, and the Central Lake Ontario Conservation Authority for impervious surface data and access to the reference ponds in this study.
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Vincent, J., Kirkwood, A.E. Variability of water quality, metals and phytoplankton community structure in urban stormwater ponds along a vegetation gradient. Urban Ecosyst 17, 839–853 (2014). https://doi.org/10.1007/s11252-014-0356-1
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DOI: https://doi.org/10.1007/s11252-014-0356-1