Measures of reproductive success and polychlorinated biphenyl residues in eggs and chicks of Forster's terns on Green Bay, Lake Michigan, Wisconsin—1988

  • Hallett J. Harris
  • Thomas C. Erdman
  • Gerald T. Ankley
  • Keith B. Lodge


Data on reproductive success of Forster's tern (Sterna forsteri) from Green Bay, Lake Michigan in 1983 are compared with data collected in 1988. In 1988 measures of reproductive performance (hatching success, number of young fledged, and length of incubation) were improved. Concentrations of total polychlorinated biphenyls (PCBs) and planar PCB congeners in the eggs were compared between years. Median total PCB residue was 67% lower in 1988 (\(\bar X\)=7.3 μg/g). This corresponds to a 42% reduction in tetrachlorodibenzo-p-dioxin equivalents (TCDD-EQ) from 1983 to 1988. We suggest that contaminant reduction and improved reproductive performance were due to low river flows in 1988 and associated reduced PBC loading into Green Bay. Forty-two percent of the matured chicks died before fledgling, and their body weight growth curves were much lower than normal. Young accumulate total PCBs at a rate of 17.6 μg/day. A no-observable-adverse-effects level (NOAEL) of 40–84 μg/kg/day was estimated from the two year results using the least observable adverse effects level (LOAEL)/NOAEL rating values.


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Copyright information

© Springer-Verlag New York Inc 1993

Authors and Affiliations

  • Hallett J. Harris
    • 1
  • Thomas C. Erdman
    • 1
  • Gerald T. Ankley
    • 2
  • Keith B. Lodge
    • 3
  1. 1.University of Wisconsin-Green BayGreen BayUSA
  2. 2.Environmental Research LaboratoryU.S. Environmental Protection AgencyDuluthUSA
  3. 3.Natural Resources Research InstituteUniversity of Minnesota-DuluthDuluthUSA

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