A Comparison of Mercury Levels in Feathers and Eggs of Osprey (Pandion haliaetus) in the North American Great Lakes

  • K.D.  Hughes
  • P.J.  Ewins
  • K.E.  Clark

DOI: 10.1007/s002449900275

Cite this article as:
Hughes, K., Ewins, P. & Clark, K. Arch. Environ. Contam. Toxicol. (1997) 33: 441. doi:10.1007/s002449900275


Osprey (Pandion haliaetus) eggs and chick feathers were collected for mercury analysis from nests at four Great Lakes study areas in Ontario (three “naturally formed” lakes in southern Ontario and one reservoir in northern Ontario) and two New Jersey study areas in 1991–1994. Adult osprey feathers were sampled from three Great Lakes study areas in 1991. Feathers sampled from chicks (approximately 28–35 days old) appear to be better indicators of local contaminant conditions since spatial patterns of mercury in known prey, yellow perch (Perca flavescens), also collected in these areas, were more similar to chick feathers than to eggs. Mercury levels were less variable in chick feathers than in eggs. Estimates of biomagnification factors using prey of known size at these areas were also less variable in feathers than in eggs. At naturally formed lakes, no significant correlation in mercury levels between eggs and chick feathers from the same nest was apparent, suggesting that the source of mercury contamination was not the same in these two tissues: mercury levels in eggs reflect mercury acquired on the breeding grounds, wintering grounds, and migratory route; mercury levels in chick feathers reflect local dietary conditions on the breeding grounds. Mercury levels in both osprey eggs and chick feathers were higher at the Ogoki Reservoir than at naturally formed lakes. Adult osprey feathers had higher mercury concentrations than chick feathers. Mercury levels in osprey eggs, chick feathers, and adult feathers did not approach levels associated with toxic reproductive effects.

Copyright information

© Springer-Verlag New York Inc. 1997

Authors and Affiliations

  • K.D.  Hughes
    • 1
  • P.J.  Ewins
    • 2
  • K.E.  Clark
    • 3
  1. 1.Canadian Wildlife Service, Environment Canada, Canada Centre for Inland Waters, Box 5050, Burlington, Ontario, Canada L7R 4A6 CA
  2. 2.World Wildlife Fund Canada, 90 Eglinton Avenue East, Suite 504, Toronto, Ontario, Canada M4P 2Z7 CA
  3. 3.New Jersey Division of Fish, Game and Wildlife, Endangered and Nongame Species Program, 2201 Route 631, Woodbine, New Jersey 08270, USA US

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