Record Display for the EPA National Library Catalog


OLS Field Name OLS Field Data
Main Title Teratogenic Effects of the Fungicide Benomyl on Posterior Segmental Regeneration in the Earthworm, 'Eisenia fetida'.
Author Zoran, M. J. ; Heppner, T. J. ; Drewes, C. D. ;
CORP Author Iowa State Univ., Ames.;Corvallis Environmental Research Lab., OR.
Year Published 1986
Report Number EPA-R-810006; EPA/600/J-86/411;
Stock Number PB88-104310
Additional Subjects Worms ; Fungicides ; Regeneration(Physiology) ; Toxicology ; Morphology ; Abnormalities ; Reprints ; Teratogenesis ; Benomyl
Library Call Number Additional Info Location Last
NTIS  PB88-104310 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. 06/21/1988
Collation 14p
Earthworms, Eisenia fetida, were treated by surface exposure to the fungicide benomyl at various stages of posterior segmental regeneration. Teratogenic effects of benomyl were observed when worms were treated 7-11 days after amputation (i.e. during the normal period of segmental replication), but not during days 1-5, 13-17, or 19-23. Teratogenic effects included a reduction in the number of regenerated segments, an increased frequency of segmental groove anomalies, and a variety of monstrosities. The effects of benomyl treatment on the number of regenerated segments and frequency of anomalies were dose-dependent within a narrow concentration range (approximately 0.2-5.0 mg liter-1); at higher concentrations (e.g. 25 mg liter-1) teratogenic effects were less frequent because the onset of segmental delineation was delayed until well after exposure. Non-invasive electrophysiological recordings from treated worms indicated that functional integrity of giant nerve fiber conduction pathways was established in all anomalously regenerated tail segments, except in a two-tailed monstrosity. The evidence supports the hypothesis that these teratogenic effects derive from an antimitotic mode of action of benomyl on segmental regeneration. (Copyright (c) 1986 Pesticide Science.)