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- Title
Dietary exposure of three passerine species to PCDD/DFs from the Chippewa, Tittabawassee, and Saginaw River floodplains, Midland, Michigan, USA.
- Authors
Fredricks, Timothy B.; Giesy, John P.; Coefield, Sarah J.; Seston, Rita M.; Haswell, Melissa M.; Tazelaar, Dustin L.; Bradley, Patrick W.; Moore, Jeremy N.; Roark, Shaun A.; Zwiernik, Matthew J.
- Abstract
Dietary exposure of house wrens ( Troglodytes aedon), tree swallows ( Tachycineta bicolor), and eastern bluebirds ( Sialia sialis) to polychlorinated dibenzofurans (PCDFs) and polychlorinated dibenzo- p-dioxins (PCDDs) near Midland, Michigan (USA) was evaluated based on site-specific data, including concentrations of residues in bolus samples and individual invertebrate orders and dietary compositions by study species. Site-specific dietary compositions for the three species were similar to those reported in the literature, but differed in their relative proportions of some dietary items. Oligocheata (non-depurated) and Brachycera (Diptera) contained the greatest average concentrations of ΣPCDD/DFs of the major site-specific dietary items collected via food web-based sampling. Average ingestion values of ΣPCDD/DFs from site-specific bolus-based and food web-based dietary concentrations for nestlings at study areas (SAs) were 6- to 20-fold and 2- to 9-fold greater than at proximally located reference areas (RAs), respectively. Average ingestion values of total 2,3,7,8-tetrachlorodibenzo- p-dioxin equivalents (TEQ) from site-specific bolus-based and food web-based dietary concentrations for nestlings at SAs were 31- to 121-fold and 9- to 64-fold greater than at proximally located RAs, respectively. Estimates of ΣPCDD/DFs and TEQ tissue concentrations based on nestling dietary exposures were greater than those measured. Plausible explanations include nestling metabolism of 2,3,7,8-tetrachlorodibenzofuran and assimilation rates of less than the 70% assumed to occur over the nestling growth period. Profiles of the relative concentrations of individual PCDD/DF congeners in samples of invertebrates and bolus at SAs on the Tittabawassee River downstream of the source of contamination were dominated by 1,2,3,4,6,7,8,9-octachlorodibenzo- p-dioxin (22% to 44%) and 2,3,7,8-tetrachlorodibenzofuran (18% to 50%).
- Subjects
DIOXINS &; the environment; HOUSE wren; TREE swallow; EASTERN bluebird; POLYCHLORINATED dibenzofurans; FOOD chains
- Publication
Environmental Monitoring & Assessment, 2011, Vol 172, Issue 1-4, p91
- ISSN
0167-6369
- Publication type
Article
- DOI
10.1007/s10661-010-1319-5