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Controls on Nutrient Cycling in Estuarine Mangrove Lake Sediments
| Content Provider | MDPI |
|---|---|
| Author | Owens, Michael Kelly, Stephen Frankovich, Thomas Rudnick, David Fourqurean, James Cornwell, Jeffrey |
| Copyright Year | 2021 |
| Description | We estimated the net exchange of nitrogen and phosphorus species using core incubations under light and dark conditions in estuarine lakes that are the aquatic interface between the freshwater Everglades and marine Florida Bay. These lakes and adjacent shallow water Florida Bay environments are sites where the restoration of hydrological flows will likely have the largest impact on salinity. Sediment respiration, measured by oxygen uptake, averaged (±S.D.) −2400 ± 1300, −300 ± 1000, and 1900 ± 1400 μmol $m^{−2}$ $h^{−1}$ for dark incubations, light incubations, and gross photosynthesis estimates, respectively, with dark incubations consistent with oxygen uptake measured by microelectrode profiles. Although most fluxes of soluble reactive phosphorus, nitrate, and $N_{2}$–N were low under both light and dark incubation conditions, we observed a number of very high efflux events of NH_{4}$^{+}$ during dark incubations. A significant decrease in NH_{4}$^{+}$flux was observed in the light. The largest differences between light and dark effluxes of NH_{4}$^{+}$ occurred in lakes during periods of low coverage of the aquatic macrophyte Chara hornemannii Wallman, with NH_{4}$^{+}$ effluxes > 200 μmol $m^{−2}$ $h^{−1}$. Increasing freshwater flow from the Everglades is expected to expand lower salinity environments suitable for Chara, and therefore, diminish the sediment NH_{4}$^{+}$ effluxes that may fuel algal blooms. |
| Starting Page | 626 |
| e-ISSN | 20771312 |
| DOI | 10.3390/jmse9060626 |
| Journal | Journal of Marine Science and Engineering |
| Issue Number | 6 |
| Volume Number | 9 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-06-04 |
| Access Restriction | Open |
| Subject Keyword | Journal of Marine Science and Engineering Oceanography Nutrient Fluxes Everglades Sediment Chara Water Management |
| Content Type | Text |
| Resource Type | Article |
