Passerine Exposure to Primarily PCDFs and PCDDs in the River Floodplains Near Midland, Michigan, USA

• Main Authors: Fredricks, Timothy B.（Michigan State Univ, Dept Zool, E Lansing, MI 48824 USA）, Zwiernik, Matthew J.（Michigan State Univ, Dept Anim Sci, E Lansing, MI 48824 USA）, Seston, Rita M.（Michigan State Univ, Dept Zool, E Lansing, MI 48824 USA）, Coefield, Sarah J.（Michigan State Univ, Dept Zool, E Lansing, MI 48824 USA）, Plautz, Stephanie C.（So Illinois Univ, Cooperat Wildlife Res Lab, Carbondale, IL 62901 USA）, Tazelaar, Dustin L.（ Michigan State Univ, Dept Anim Sci, E Lansing, MI 48824 USA）, Shotwell, Melissa S.（ENTRIX Inc, Okemos, MI 48864 USA）, Bradley, Patrick W.（ Michigan State Univ, Dept Anim Sci, E Lansing, MI 48824 USA）, Kay, Denise P.（ENTRIX Inc, Okemos, MI 48864 USA）, Giesy, John P
• Format: Journal Article
• Language: English
• Published: SPRINGER 01.05.2010
• Subjects: AMONG-CLUTCH VARIATION; ARYL-HYDROCARBON RECEPTOR; BLUEBIRDS SIALIA-SIALIS; CROWNED NIGHT-HERONS; DIBENZO-P-DIOXINS; EASTERN BLUEBIRDS; POLYCHLORINATED BIPHENYL CONTAMINATION; RING-NECKED PHEASANT; SWALLOWS TACHYCINETA-BICOLOR; TREE SWALLOWS

House wren (Troglodytes aedon), tree swallow (Tachycineta bicolor), and eastern bluebird (Sialia sialis) tissues collected in study areas (SAs) downstream of Midland, Michigan (USA) contained concentrations of polychlorinated dibenzofurans (PCDFs) and polychlorinated dibenzo-p-dioxins (PCDDs) greater than in upstream reference areas (RAs) in the region. The sum of concentrations of PCDD/DFs (I PCDD pound/DFs) in eggs of house wrens and eastern bluebirds from SAs were 4- to 22-fold greater compared to those from RAs, whereas concentrations in tree swallow eggs were similar among areas. Mean concentrations of I PCDD pound/DFs and sum 2,3,7,8-tetrachlorodibenzo-p-dioxin equivalents (I TEQs(WHO-Avian)) pound, based on 1998 WHO avian toxic equivalency factors, in house wren and eastern bluebird eggs ranged from 860 (430) to 1500 (910) ng/kg wet weight (ww) and 470 (150) to 1100 (510) ng/kg ww, respectively, at the most contaminated study areas along the Tittabawassee River, whereas mean concentrations in tree swallow eggs ranged from 280 (100) to 760 (280) ng/kg ww among all locations. Concentrations of I PCDD pound/DFs in nestlings of all studied species at SAs were 3- to 50-fold greater compared to RAs. Mean house wren, tree swallow, and eastern bluebird nestling concentrations of I PCDD pound/DFs and I TEQs(WHO-Avian) pound ranged from 350 (140) to 610 (300) ng/kg ww, 360 (240) to 1100 (860) ng/kg ww, and 330 (100) to 1200 (690) ng/kg ww, respectively, at SAs along the Tittabawassee River. Concentrations of I TEQs(WHO-Avian) pound were positively correlated with I PCDD pound/DF concentrations in both eggs and nestlings of all species studied. Profiles of relative concentrations of individual congeners were dominated by furan congeners (69-84%), primarily 2,3,7,8-tetrachlorodibenzofuran and 2,3,4,7,8-pentachlorodibenzofuran, for all species at SAs on the Tittabawassee and Saginaw rivers but were dominated by dioxin congeners at upstream RAs. Canada Research Chair program ; Dow Chemical Company, Midland, Michigan