Mercury Contamination in Idaho Bald Eagles, Haliaeetus leucocephalus

  • Marc J. Bechard
  • Dusty N. Perkins
  • Gregory S. Kaltenecker
  • Steve Alsup
Article

Abstract

Because mercury contamination is potentially threatening to bald eagle (Haliaeetus leucocephalus) populations, we collected molted feathers at nests to determine the level of contamination in bald eagles in the state of Idaho, USA. Eagle feathers contained measurable amounts of cadmium (Cd), chromium (Cr), selenium (Se), lead (Pb), as well as mercury (Hg). Cadmium, Cr, Se, and Pb levels averaged 0.17, 4.68, 2.02, and 1.29 mg/kg dry weight, respectively, and were at or below concentrations indicated as causing reproductive failure in bald eagles. Mercury contamination was found to be the highest averaging 18.74 mg/kg dry weight. Although a concentration of only 7.5 mg/kg dry weight Hg in bird feathers can cause reduced productivity and even sterility, all of the eagles we sampled bred successfully and the population of bald eagles continues to grow annually throughout the state.

Keywords

Bald eagle Haliaeetis leucocephalus Mercury contamination Idaho 

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Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  • Marc J. Bechard
    • 1
  • Dusty N. Perkins
    • 1
  • Gregory S. Kaltenecker
    • 1
  • Steve Alsup
    • 1
  1. 1.Raptor Research Center, Department of BiologyBoise State UniversityBoiseUSA

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