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Role of emergent and submerged vegetation and algal communities on nutrient retention and management in a subtropical urban stormwater treatment wetland

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Abstract

A 4.6-ha urban stormwater treatment wetland complex in southwest Florida has been investigated for several years to understand its nutrient retention dynamics. This study investigates the role of aquatic vegetation, both submerged vegetation (such as benthic macrophytic and algal communities) and emergent plant communities, on changes in nutrient fluxes through the wetlands. Gross and net primary productivity of water column communities and net primary productivity of emergent macrophytes were used to estimate nutrient fluxes through vegetation in these wetlands using biannual biomass, nutrient concentrations of plant material, and areal coverage data. Emergent macrophyte net primary productivity was estimated as the difference between the increase of productivity during the wet season and the loss during the dry season which, in turn, suggested approximately 0.11g-N m− 2 y− 1 and 0.09g-P m− 2 yr− 2 being removed, primarily from the soil, by emergent vegetation. Water column primary productivity accounted for a much larger flux of nutrients with approximately 39.6g-N m− 2 yr− 1 and 2.4g-P m− 2 yr− 1 retained in algal communities. These fluxes, combined with measurements in parallel studies, allowed us to develop preliminary nutrient budgets for these wetlands and identify gaps, or missing fluxes, in our models for these wetlands. The results further validated previous findings that suggested that there are large inputs of nitrogen (up to 62.3g-N m− 2 yr− 1) that are not accounted for by the pumped inflow. Additionally, management suggestions are provided to improve water quality by identifying vegetative species that are most effective at retaining nutrients.

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Data Availability

The datasets generated and analyzed during the current study are available from the corresponding author or the Everglades Wetland Research Park in Naples, Florida on reasonable request.

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Acknowledgements

This work was partially supported by Collier County, FL, contract 814646852. We also appreciate Collier County for permitting us to conduct this research at Freedom Park. Salary of the first author was paid in part by a generous donation to the FGCU Foundation by Dennis and Janet Vasey, Naples, Florida. Field sampling was assisted by Andrew Wilson, Bing Bing Jiang, Feng Li, Linfeng Li, and other graduate and undergraduate students and visiting scientists to FGCU’s Everglades Wetlands Research Park. Editorial and content contributions were provided by Drs. Mark C. Rains, Kai C. Rains, and Ariel E. Lugo.

Funding

Partial financial support was received from Collier County, FL, contract 814646852. Salary for the first author was partially paid for by a generous donation to the FGCU Foundation by Dennis and Janet Vasey, Naples, Florida.

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Contributions

All authors contributed to the study conception, design and data collection. Material preparation was performed by Lauren N. Griffiths and Taylor Nesbit Haupt. Data analysis was performed by Lauren N. Griffiths and Li Zhang. The first draft of the manuscript was written by Lauren N. Griffiths. William J. Mitsch secured funding for much of the project and wrote an initial final report to Collier County and provided editorial comments. All authors read and approved the final manuscript.

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Correspondence to Lauren N. Griffiths.

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Griffiths, L.N., Haupt, T.N., Zhang, L. et al. Role of emergent and submerged vegetation and algal communities on nutrient retention and management in a subtropical urban stormwater treatment wetland. Wetlands Ecol Manage 29, 245–264 (2021). https://doi.org/10.1007/s11273-020-09781-6

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  • DOI: https://doi.org/10.1007/s11273-020-09781-6

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