Mercury Concentrations in Bullfrogs (Rana castebiena) Collected from a Southern Nevada Wetland

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A considerable amount of time and effort has been spent determining concentrations of environmental contaminants in edible tissue from fish and wildlife species in the United States. The majority of these investigations are concerned with sport fish and migratory waterfowl These species are known to accumulate both metals and organochlorine compounds which are transferred up the food chain and can result in exposure to the human population. However, one additional aquatic species that may be of concern is the bullfrog (Rana catesbeiana) because of its wide geographic distribution due to its human mediated introduction into many aquatic ecosystems, and because the consumption of frog legs is considered a delicacy by certain populations. Bullfrogs are harvested and consumed by sportsmen across the United States, and management agencies often have extremely liberal, or no, restrictions on their harvest. In southern Nevada, for example, bullfrogs can be harvested year-round with no daily bag limit (Nevada Division of Wildlife 2001). Thus, certain human populations which consume bullfrogs on a regular basis may be exposed to elevated levels of environmental contaminants. Additionally, recent investigations have demonstrated that mercury may also have effects on survival, growth, development of amphibian populations (Briston and Threlkeld 1998; McCrary and Heagler 1997; Punzo 1993a; Punzo 1993b; Kanamadi and Saidapur 1992)


Environmental Health and Protection | Environmental Sciences | Toxicology | Water Resource Management


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