Dietary exposure of great blue heron (Ardea herodias) to PCDD/DFs in the Tittabawassee River floodplain, MI, USA

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

2 Scopus Citations
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Author(s)

  • Rita M. Seston
  • Timothy B. Fredricks
  • Dustin L. Tazelaar
  • Sarah J. Coefield
  • Patrick W. Bradley
  • And 5 others
  • Shaun A. Roark
  • John L. Newsted
  • Denise P. Kay
  • Matthew J. Zwiernik
  • John P. Giesy

Detail(s)

Original languageEnglish
Pages (from-to)494-503
Journal / PublicationEcotoxicology and Environmental Safety
Volume74
Issue number3
Publication statusPublished - Mar 2011

Abstract

Concentrations of dioxin-like compounds, primarily polychlorinated dibenzofurans (PCDFs), in soils and sediments of the Tittabawassee River (TR) and associated floodplains downstream of Midland, Michigan (USA) were greater than upstream sites and prompted a site-specific risk assessment of great blue herons (GBH). Dietary exposure of GBH to PCDFs and polychlorinated dibenzo-p-dioxins (PCDDs) was evaluated based on site-specific concentrations of residues in prey items. Concentrations of σPCDD/DFs and 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents (TEQWHO-Avian) in prey items collected from the TR were consistently greater than those collected from associated reference areas (RAs) and further downstream in the Saginaw River (SR). The average daily dose (ADDpot) of σPCDD/DFs to GBH was 45- to 54-fold greater along the TR and 12-fold greater along the SR when compared to the RA. σPCDD/DFs were normalized to TEQWHO-Avian, and fold differences in the ADDpot increased, being 150- to 190-fold greater along the TR and 36-fold greater along the SR than they were in the RA. Greater fold changes in the ADDpot based on TEQWHO-Avian between the RA and the TR and SR was due to prey items from the latter reaches having a greater relative toxic potency of σPCDD/DFs, primarily from greater amounts of 2,3,7,8-tetrachlorodibenzofuran but also 2,3,4,7,8-pentachlorodibenzofuran. Potential for adverse population-level effects from site-specific contaminant exposures were evaluated via comparison to selected toxicity reference values. The prediction of minimal to no risk of adverse population-level effects resultant from the assessment of site-specific dietary exposure of GBH to σPCDD/DFs along the TR and SR is consistent with site-specific assessments of tissue-based exposures as well as population condition. © 2010 Elsevier Inc.

Research Area(s)

  • Avian, Dioxins, Fish, Furans, Polychlorinated biphenyls, TEQs

Citation Format(s)

Dietary exposure of great blue heron (Ardea herodias) to PCDD/DFs in the Tittabawassee River floodplain, MI, USA. / Seston, Rita M.; Fredricks, Timothy B.; Tazelaar, Dustin L.; Coefield, Sarah J.; Bradley, Patrick W.; Roark, Shaun A.; Newsted, John L.; Kay, Denise P.; Zwiernik, Matthew J.; Giesy, John P.

In: Ecotoxicology and Environmental Safety, Vol. 74, No. 3, 03.2011, p. 494-503.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review