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- Title
Great horned owl (Bubo virginianus) dietary exposure to PCDD/DF in the Tittabawassee River floodplain in Midland, Michigan, USA.
- Authors
Coefield, Sarah J.; Zwiernik, Matthew J.; Fredricks, Timothy B.; Seston, Rita M.; Nadeau, Michael W.; Tazelaar, Dustin L.; Moore, Jeremy N.; Kay, Denise P.; Roark, Shaun A.; Giesy, John P.
- Abstract
Soils and sediments in the floodplain of the Tittabawassee River downstream of Midland, Michigan, USA contain elevated concentrations of polychlorinated dibenzofurans (PCDF) and polychlorinated dibenzo-p-dioxins (PCDD). As a long-lived, resident top predator, the great horned owl (Bubo virginianus; GHO) has the potential to be exposed to bioaccumulative compounds such as PCDD/DF. Site-specific components of the GHO diet were collected along 115 km of the Tittabawassee, Pine, Chippewa, and Saginaw Rivers during 2005 and 2006. The site-specific GHO biomass-based diet was dominated by cottontail rabbits (Sylvilagus floridanus) and muskrats (Ondatra zibethicus). Incidental soil ingestion and cottontail rabbits were the primary contributors of PCDD/DF to the GHO diet. The great horned owl daily dietary exposure estimates were greater in the study area (SA) (3.3 to 5.0 ng 2,3,7,8-TCDD equivalents (TEQWHO-avian)/kg body wt/d) than the reference area (RA) (0.07 ng TEQWHO-Avian/kg body wt/d). Hazard quotients (HQs) based on central tendency estimates of the average daily dose and no-observable-adverse effect level (NOAEL) for the screech owl and uncertainty factors were <1.0 for both the RA and the SA. Hazard quotients based on upper end estimates of the average daily dose and NOAEL were <1.0 in the RA and up to 3.4 in the SA. Environ. Toxicol. Chem. 2010;29:2350-2362. © 2010 SETAC
- Subjects
TITTABAWASSEE River (Mich.); MICHIGAN; GREAT horned owl; POLYCHLORINATED dibenzofurans; POLYCHLORINATED dibenzodioxins; COTTONTAILS; ENVIRONMENTAL toxicology
- Publication
Environmental Toxicology & Chemistry, 2010, Vol 29, Issue 10, p2350
- ISSN
0730-7268
- Publication type
Article
- DOI
10.1002/etc.291