Bioenergetics-based modeling of individual PCB congeners in nestling tree swallows from two contaminated sites on the Upper Hudson River, New York

John W. Nichols, Kathy R. Echols, Donald E. Tillitt, Anne L. Secord, John P McCarty

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

A bioenergetics-based model was used to simulate the accumulation of total PCBs and 20 PCB congeners by nestling tree swallows at two contaminated sites on the Upper Hudson River, New York. PCB concentrations in birds were calculated as the sum of inherited residues and those acquired through consumption of contaminated insects. Close agreement between simulations and measured residues in 5-, 10-, and 15-day-old nestlings was obtained when PCB concentrations in the diet were set equal to those in food boli taken from adult birds. These simulations were further optimized by fitting the value of a dietary assimilation efficiency constant. Fitted constants for both sites were similar and averaged about 0.7. An evaluation of model performance for individual congeners provided no evidence of metabolic biotransformation. The results of this study are consistent with a companion effort in which principal components analysis was used to compare PCB congener patterns in insects and in tree swallow eggs, nestlings, and adults. Together, these studies establish a quantitative linkage between nestling tree swallows and the insects that they consume and provide strong support for the use of nestling swallows as a biomonitoring species for exposure assessment.

Original languageEnglish (US)
Pages (from-to)6234-6239
Number of pages6
JournalEnvironmental Science and Technology
Volume38
Issue number23
DOIs
Publication statusPublished - Dec 1 2004

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ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

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