Florida Everglades

FIGURE 3.3 Pearson correlation coefficients between fish (Gambusia) Hg concentration and MeHg concentrations in various environmental media sediment, porewater, surface water, and suspended particulate matter (SPM) from the Florida Everglades (1995-1998). 

FIGURE 3.4 Results from the May 2000 dose-response experiment conducted in situ within mesocosms installed at 4 sites in the Florida Everglades and using isotopically labeled Hg. Experimental conditions called for dosing at 0.5, 1.0, and 2.0 times the ambient loading rate... 

FIGURE 3.7 MeHg concentration (ng/g dry weight) in sediment from 5 sites in the Florida Everglades. Box plots represent 5 replicate samples taken at 4 different times over 4 years. 

Methylmercuiy concentrations at site 3 A-15 in the Florida Everglades have shown distinct declining trends over the 8-year period from 1995 to 2003. A regression analysis of this data string shows a statistically significant (p = 0.048) decline rate of about 0.043 ng/L/year, and an overall decline of about 0.35 ng/L over the 8-year... 

Atkeson T, Axelrad D, Pollman C, Keeler G. 2003. Integrating atmospheric mercury deposition and aquatic cycling in the Florida Everglades an approach for conducting a total maximum daily load analysis for an atmospherically derived pollutant. Tallahassee (FL) Florida Department of Environmental Protection (FDEP) (http //www. floridadep.org/labs/mercury/index.htm). 

Krabbenhoft DP, Hurley JP, Olson ML, Cleckner LB. 1998b. Diel variability of mercury phase and species distributions in the Florida Everglades. Biogeochemistry 40 311-325. 

Ravichandran M, Aiken GR, Reddy MM, Ryan JN. 1998. Enhanced dissolution of cinnabar (mercuric sulfide) by organic matter from the Florida Everglades. Environ Sci Technol 32 3305-3311. 

Cleckner LB, Garrison PG, Hmley JP, Olson ML, Krabbenhofl DP. 1998. Trophic transfer of methyl mercury in the northern Florida Everglades. Biogeochemistry 40 347-361. 

Cleckner LB, Gihnom CC, Krabbenhoft DP, Hmley JP. 1999. Mercury methylation in periphyton of the Florida Everglades. Limnol Oceanogr 44 1815-1825. 

Trend Detection The Florida Everglades Case Study... 

FIGURE 5.4 Mercury concentrations in axial muscle tissue of largemouth bass from 2 canals in the Florida Everglades. 

Duvall SE, Barron MG. 2000. A screening level probabilistic risk assessment of mercury in Florida Everglades food webs. Ecotoxicol Environ Saf 47 298-305. 

Guentzel JL, Landing WM, Gill GA, Polhnan CD. 1998. Mercury and major ions in rainfall, throughfall, and foliage from the Florida Everglades. Sci Total Environ 213 43-51. 

Rood BE, Gottgens JF, DeUrno JJ, Earle CD, CrismanTL. 1995. Mercury accumulation trends in Florida Everglades and savannas marsh flooded soils. Water Air Soil Pollut 80 981-990. 

Rumbold DG, Niemczyk SL, Fink LE, Chandrasekhar T, Harkanson B, Laine KA. 2001. Mercury in eggs and feathers of great egrets (Ardea albus) from the Florida Everglades. Arch Environ Contam Toxicol 41 501-507. 

Yanochko GM, Jagoe CH, Brisbin Jr IL. 1997. Tissue mercury concentrations in alligators Alligator mississippiensis) from the Florida Everglades and the Savannah River Site, South Carolina. Arch Environ Contam Toxicol 32 323-328. 

Chen, Angeli S-H. "Flavonoid Pigments in the Red Mangrove, Rhizophora Mangle L., of the Florida Everglades and in the Peat Derived from it, M.S. Thesis, Pennsylvania State University, 1971, 233 pp. 

AMPHIBIANS AND REPTILES Alligator, Alligator mississippiensis, from mercury-contaminated areas total mercury, 1994-95, Florida Everglades vs. Savannah River SC Blood No data vs. 2.2 FW 55... 

More research is needed on mercury removal technology. In the Florida Everglades, for example, using prototype wetlands of 1545 ha, removal of agricultural nutrients from stormwater reduced total mercury and methylmercury concentrations in water by as much as 70% in the first 2 years of operation moreover, total mercury concentrations in largemouth bass were about 0.1 mg Hg/kg FW muscle throughout the project site vs. 0.5 mg Hg/kg FW in adjacent areas (Miles and Fink 1998). 

Eggs of the American crocodile (Crocodylus acutus) from the Florida Everglades contained up to 2.9 mg/kg fresh weight of DDE and 0.86 mg/kg of polychlorinated biphenyls, but less than 0.02 mg mirex/kg (Hall et al. 1979). Livers of the deep sea fish (Antimora rostrata) collected from 1971 to 1974 from a depth of 2500 m off the U.S. east coast, contained measurable concentrations of DDT and its degradation products, and dieldrin, but no mirex (Barber and Warlen 1979). 

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