Controls on Nutrient Cycling in Estuarine Mangrove Lake Sediments
| Autor: | Stephen P. Kelly, Michael S. Owens, David T. Rudnick, James W. Fourqurean, Thomas A. Frankovich, Jeffrey C. Cornwell |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
0106 biological sciences nutrient fluxes 010504 meteorology & atmospheric sciences Naval architecture. Shipbuilding. Marine engineering VM1-989 chemistry.chemical_element Ocean Engineering GC1-1581 Oceanography 01 natural sciences Algal bloom chemistry.chemical_compound Nitrate water management Aquatic plant 0105 earth and related environmental sciences Water Science and Technology Civil and Structural Engineering Chara geography geography.geographical_feature_category biology 010604 marine biology & hydrobiology Phosphorus Estuary Everglades biology.organism_classification Salinity sediment chemistry Environmental chemistry Environmental science Bay |
| Zdroj: | Journal of Marine Science and Engineering Volume 9 Issue 6 Journal of Marine Science and Engineering, Vol 9, Iss 626, p 626 (2021) |
| ISSN: | 2077-1312 |
| DOI: | 10.3390/jmse9060626 |
| Popis: | 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 N2–N were low under both light and dark incubation conditions, we observed a number of very high efflux events of NH4+ during dark incubations. A significant decrease in NH4+flux was observed in the light. The largest differences between light and dark effluxes of NH4+ occurred in lakes during periods of low coverage of the aquatic macrophyte Chara hornemannii Wallman, with NH4+ 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 NH4+ effluxes that may fuel algal blooms. |
| Databáze: | OpenAIRE |
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