CS26 Organic Carbon Dynamics
Date: Thursday, June 13, 2002
Time: 9:30:00 AM
Location: Carson C
 
MaddenCJ, Everglades Division, Sth Florida Water Mgt District, 3301 GC Rd. W Palm Beach, FL 33406, USA, cmadden@sfwmd.gov
Childers, D, L, Wetland Ecosystems Ecology Lab, SERP, Dept. of Biol. Sciences, FIU, Miami FL, USA, childers@fiu.edu
Jaffe, R, , Environmental Geochemistry Lab, SERP, Dept. of Chemistry, FIU, Miami FL, USA, jaffer@fiu.edu
 
PATTERN AND DISTRIBUTION OF DISSOLVED ORGANIC MATTER IN THE SOUTHERN EVERGLADES AND FLORIDA BAY
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The Southern Everglades is directly connected to Florida Bay by channelized and diffuse hydrologic flows. The importance of inputs of nutrients and allochthonous materials to the bay via these flows is currently under considerable debate. Organic material in dissolved form could potentially be a significant source of nutrients to bay autotrophic and microbial communities. We made measurements of dissolved, total and inorganic nutrient concentrations in transects in two major subwatersheds of northern Florida Bay most directly impacted by hydrologic restoration. Fluorescence measurements of DOM were also made along the wetland-bay margin using a high-resolution spatial mapping system. We found decreasing amounts of some inorganics, and increasing concentrations of DOM (avg. rel. fluorescence=0.97 canal; 1.27 marsh; 2.50 bay) with distance downstream in the wetland. Accumulations of DOM in Florida Bay occurred along parts of the northern bay margin. Highest concentrations were associated with inputs from the mangrove ecotone (max=5.0), while significant, but lower levels were associated with flows from marsh-dominated communities (max=2.5). DOM disappeared rapidly in the water column with distance from the wetland, exhibiting strongly non-conservative behavior.