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  • Mercury contamination found in Everglades dolphins

State and federal plans to restore the Everglades are expected to call for pumping more water into the marsh.

Geochemistry of Sulfur in the Florida Everglades: 1994 through 1999.

Mercury methylation in periphyton of the Florida Everglades.

High Hg contents in Everglades fish are therefore notcaused by anomalously high soil Hg.
Burmese pythons aren't the only big invasive snakes on the loosein south Florida, either: African rock pythons and boa constrictors are alsobreeding there, and several other species have been observed in the wild.

Everglades powerboats for sale by owner. - Powerboat Listings

A site in the Everglades Nutrient Removal (ENR) project was also monitored.
Methylation is a product of complex processes that move and transform mercury. Atmospheric deposition contains the three principal forms of mercury, although inorganic divalent mercury (HgII) is the dominant form. Once in surface water, mercury enters a complex cycle in which one form can be converted to another. Mercury attached to particles can settle onto the sediments where it can diffuse into the water column, be resuspended, be buried by other sediments, or be methylated. Methylmercury can enter the food chain, or it can be released back to the atmosphere by volatilization.

 

The dangerous levels of mercury in the florida everglades


The concentration of dissolved organic carbon (DOC) and pH have a strong effect on the ultimate fate of mercury in an ecosystem. Studies have shown that for the same species of fish taken from the same region, increasing the acidity of the water (decreasing pH) and/or the DOC content generally results in higher mercury levels in fish, an indicator of greater net methylation. Higher acidity and DOC levels enhance the mobility of mercury in the environment, thus making it more likely to enter the food chain.


Mercury and methylmercury exposure to sunlight (specifically ultra-violet light) has an overall detoxifying effect. Sunlight can break down methylmercury to Hg(II) or Hg(0), which can leave the aquatic environment and reenter the atmosphere as a gas.


Aquatic Cycling of Mercury in the Everglades Project Database

Alkali and metal processing, incineration of coal, and medical and other waste, and mining of gold and mercury contribute greatly to mercury concentrations in some areas, but atmospheric deposition is the dominant source of mercury over most of the landscape. Once in the atmosphere, mercury is widely disseminated and can circulate for years, accounting for its wide-spread distribution. Natural sources of atmospheric mercury include volcanoes, geologic deposits of mercury, and volatilization from the ocean. Although all rocks, sediments, water, and soils naturally contain small but varying amounts of mercury, scientists have found some local mineral occurrences and thermal springs that are naturally high in mercury.

Accumulation and fate of mercury in an Everglades …

Although mercury is a globally dispersed contaminant, it is not a problem everywhere. Aside from grossly polluted environments, mercury is normally a problem only where the rate of natural formation of methylmercury from inorganic mercury is greater than the reverse reaction. Methylmercury is the only form of mercury that accumulates appreciably in fish. Environments that are known to favor the production of methylmercury include certain types of wetlands, dilute low-pH lakes in Northeast and Northcentral United States, parts of the Florida Everglades, newly flooded reservoirs, and coastal wetlands, particularly along the Gulf of Mexico, Atlantic Ocean, and San Francisco Bay.

Everglades Dolphins Have Highest Level of Mercury …

In the Everglades, as in most other ecosystems, inorganic mercury is transformed into methylmercury primarily by the action of anaerobic bacteria in surficial sediments and soils.

Used 2006 Mercury Mountaineer for Sale in Everglades …

“The data are only just now coming in, but the numbers show that we should see another big step down in incinerator mercury emissions as a result of the requirement of advanced pollution controls,” Atkeson said.