Invertebrates as Bioindicators of Mercury in the Okefenokee Swamp of Southeast Georgia
George, Bagie Mariam
Batzer, Darold P.
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Concerns have developed about elevated levels of mercury in wetland vertebrates. It is suspected that mercury moves through wetland food webs and bioaccumulates in top predators. The objective of this study was to examine mercury concentrations in the Okefenokee Swamp of southeast Georgia, focusing on levels in invertebrates. We collected amphipods, odonates, and crayfish, three groups that are important in the Okefenokee food webs, and determined mercury levels in their tissues. Although amphipods are lower on the food chain, higher levels of mercury were detected in amphipod tissues than in odonates or crayfish.