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Polychlorinated -dibenzo-p-dioxins/furans and -dioxin-like biphenyls in eggs of common terns from lime island, St. Mary's river, Michigan, USA

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Population collapse of common tern (Sterna hirundo) from Lime Island in the St. Mary's River, Michigan, USA were related to the 2,3,7,8-chlorine substituted dioxins, furans, dioxin-like PCBs, and other possible factors using unhatch egg target contaminant analysis. The most toxic congeners, 2,3,7,8-TCDD/DF was found in all samples at noticeable concentrations. Magnitude of sum 2,3,7,8-PCDD/DFs were within the range of 39-93 pg/g wet wt. Dioxin-like PCBs were within the range of 360-1230 ng/g wet wt. Great Toxic Equivalent Quantity (TEQ) contributions by 2,3,7,8-TCDF, 2,3,4,7,8-PeCDF, 2,3,7,8-TCDD, 1,2,3,7,8-PeCDD, and dioxin-like PCBs such as CB-77, CB-126 and CB-105 are considered greatly due to their influence of poor embryo development and consequent damage of embryos of common terns in egg injection studies. However, other organochlorines, heavy metals, and/or synergistic effects also taken in to account. On the whole, TEQs in the tern eggs were greater than the Lowest-Observable-Adverse Effect Level (LOAEL) for bald eagle (Haliaeetus leucocephalus) embryos observed in British Columbia, Canada. Concentrations of dioxin-like PCBs, dioxins, furans in the St. Mary's River food chain are at levels for concern for nesting colonial waterbirds. Eventually, the possible movements of analyzed chemicals downstream from a man-made flood event are discussed.
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Keywords: Common tern; Dioxin-like PCBs; Dioxins; Egg; Furans; Lime Island; Michigan; TEQ; USA

Document Type: Research Article

Affiliations: 1: Graduate School of Environment and Information Sciences Yokohama National University 79-7 Tokiwadai Hodogaya-ku Yokohama 240-8501 Japan 2: Department of Environmental Toxicology Clemson University P.O. Box 709 Pendleton SC 29670-0709 USA 3: Department of Fisheries and Wildlife 13 Natural Resources Building Michigan State University East Lansing MI 48824-1222 USA 4: U.S. Fish and Wildlife Service East Lansing Field Office 2651 Coolidge Road East Lansing MI 48823 USA 5: Shimadzu Techno-Research Inc. 1, Nishinokyo-Shimoaicho Nakagyo-ku Kyoto 604-8436 Japan

Publication date: 01 July 2004

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