Accumulation of Contaminants by Wild Turkeys and Potential for Consumer Exposure

Abstract

Despite their popularity as a game species across North America, little is known about contaminant burdens in wild turkeys (Meleagris gallopavo) inhabiting areas of environmental contamination, and their potential to expose human and wildlife consumers. We compared trace element concentrations and radionuclide activity in muscle and liver tissues of turkeys inhabiting the Savannah River Site (USA), an area with known anthropogenic contaminant inputs, with turkeys from uncontaminated areas offsite. In addition, we tested breast feathers from a subset of individuals for mercury (Hg) to assess the viability of nonlethal sampling for quantifying Hg concentrations. Finally, we quantified arsenic, Hg, and selenium (Se) in blood of live-captured turkeys inhabiting a coal ash basin on the Savannah River Site. Compared with reference samples, we found that turkeys inhabiting the Savannah River Site contained elevated Hg levels in both muscle and liver tissues, and lower concentrations of chromium. Turkeys from the ash basin also had elevated levels of Se. We found a positive correlation between breast muscle and feather Hg concentrations (F 1,59 = 267.5, R 2 = 0.82, p < 0.001), suggesting that feathers can potentially be used as a nonlethal sampling technique. All elements analyzed were below reference limits set by the Centers for Disease Control and Prevention for safe consumption. Thus, our data suggest that turkeys likely are not an important pathway of contaminant exposure on the Savannah River Site or other areas with similar contaminant distributions.