Factors affecting trace element accumulation in livers of avian species from East Poland

Abstract

The aim of this study was to determine the concentration of 12 elements in the livers of 14 different species of birds from EastPoland, as well as factors affecting their accumulation. The greatest amount of Cd was found in the livers of woodcocks. Analyses showedthat Cd accumulation in the liver was associated with the consumption of soil invertebrates. Our data show that some corvids were themost vulnerable to the effects of lead bullets. In the livers of some of them, lead levels exceeded 6 mg/kg. Expansion of food niches inthe direction of omnivorous species limited the accumulation of Hg and Cu, which resulted in low concentrations of these elementsin omnivorous species. On the other hand, deep specialization in catching fish favored accumulation of Hg and Cu. Accumulation ofMg and Mn may occur due to foraging in wetlands. Liver concentrations of Se that may result in sublethal effects and reproductiveimpairments were found in grey herons, cormorants, and mallards.