Embryo toxicity of 2,3,7,8-tetrachlorodibenzo-p-dioxin to the wood duck (Aix sponsa).

Journal Article (Journal Article)

We examined the sensitivity of the wood duck (Aix sponsa) embryo to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) by injecting the toxicant into their eggs. Six groups of wood duck eggs (n = 35 to 211 per trial) were injected with 0 to 4600 pg TCDD/g egg between 2003 and 2005. Injections were made into yolk prior to incubation, and eggs were subsequently incubated and assessed weekly for mortality. Significant TCDD-induced mortality was not observed through day 25 (90% of incubation). Liver, heart, eye, and brain histology were generally unremarkable. Hepatic ethoxyresorufin-O-deethylase activity, a biomarker of dioxin-like compound exposure, was induced by 12-fold in the 4600 pg/g treatment relative to controls. The median lethal dose for chicken (Gallus domesticus) eggs we dosed identically to wood duck eggs was about 100 pg/g, similar to other assessments of chickens. Among dioxin-like compound embryo lethality data for 15 avian genera, the wood duck 4600 pg/g no-observed-effect level ranks near the middle. Because no higher doses were tested, wood ducks may be like other waterfowl (order Anseriformes), which are comparatively tolerant to embryo mortality from polychlorinated dibenzo-p-dioxins and dibenzofurans when exposed by egg injection.

Full Text

Duke Authors

Cited Authors

  • Augspurger, TP; Tillitt, DE; Bursian, SJ; Fitzgerald, SD; Hinton, DE; Di Giulio, RT

Published Date

  • November 2008

Published In

Volume / Issue

  • 55 / 4

Start / End Page

  • 659 - 669

PubMed ID

  • 18704254

Electronic International Standard Serial Number (EISSN)

  • 1432-0703

International Standard Serial Number (ISSN)

  • 0090-4341

Digital Object Identifier (DOI)

  • 10.1007/s00244-008-9198-2


  • eng