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Wetland-water column exchanges of carbon, nitrogen, and phosphorus in a southern Everglades dwarf mangrove

Estuaries volume 24, pages 610–622 (2001)Cite this article

Abstract

We used enclosures to quantify wetland-water column nutrient exchanges in a dwarf red mangrove, (Rhizophora mangle L.) system near Taylor River, an important hydraulic linkage between the southern Everglades and eastern Florida Bay, Florida, USA. Circular enclosures were constructed around small (2.5–4 m diam) mangrove islands (n=3) and sampled quarterly from August 1996 to May 1998 to quantify net exchanges of carbon, nitrogen, and phosphorus. The dwarf mangrove wetland was a net nitrifying environment with consistent uptake of ammonium (6.6–31.4 μmol m−2 h−1) and release of nitrite +nitrate (7.1–139.5 μmol m−2 h−1) to the water column. Significant flux of soluble reactive phosphorus was rarely detected in this nutrient-poor, P-limited environment. We did observe recurrent uptake of total phosphorus and nitrogen (2.1–8.3 and 98–502 μmol m−2 h−1, respectively), as well as dissolved organic carbon (1.8–6.9 μmol m−2 h−1) from the water column. Total organic carbon flux shifted unexplainably from uptake, during Year 1, to export, during Year 2. The use of unvegetated (control) enclosures during the second year allowed us to distinguish the influence of mangrove vegetation from soil-water column processes on these fluxes. Nutrient fluxes in control chambers typically paralleled the direction (uptake or release) of mangrove enclosure fluxes, but not the magnitude. In several instances, nutrient fluxes were more than twofold greater in the absence of mangroves, suggesting an influence of the vegetation on wetland-water column processes. Our findings characterize wetland nutrient exchanges, in a mangrove forest type that has received such little attention in the past, and serve as baseline data for a system undergoing hydrologic restoration.

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Author notes

  1. Stephen E. Davis

    Present address: Department of Wildlife and Fisheries Sciences, Texas A&M University, 210 Nagle Hall, 77843, College Station, Texas

Authors and Affiliations

  1. Department of Biological Sciences and Southeast Environmental Research Center, Florida International University, University Park Campus, 33199, Miami, Florida

    Stephen E. Davis & Daniel L. Childers

  2. Coastal Ecology Institute, Center for Coastal, Energy, and Environmental Resources, 70803, Baton Rouge, Louisiana

    John W. Day

  3. Everglades, Systems Research Division, South Florida Water Management District, 3301 Gun Club Road, 33416, West Palm Beach, Florida

    David T. Rudnick & Fred H. Sklar

Authors
  1. Stephen E. Davis
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  2. Daniel L. Childers
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  3. John W. Day
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  4. David T. Rudnick
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  5. Fred H. Sklar
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Correspondence to Stephen E. Davis.

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Davis, S.E., Childers, D.L., Day, J.W. et al. Wetland-water column exchanges of carbon, nitrogen, and phosphorus in a southern Everglades dwarf mangrove. Estuaries 24, 610–622 (2001). https://doi.org/10.2307/1353261

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  • DOI: https://doi.org/10.2307/1353261

Keywords

  • Mangrove Forest
  • Soluble Reactive Phosphorus
  • Soluble Reactive Phosphorus Concentration
  • Significant Flux
  • Mangrove Wetland