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Main Title Sublethal Neurotoxic Effects of the Fungicide Benomyl on Earthworms ('Eisenia fetida').
Author Callahan, C. A. ; Drewes, C. D. ; Zoran, M. J. ;
CORP Author Corvallis Environmental Research Lab., OR. ;Iowa State Univ., Ames. Dept. of Zoology.
Year Published 1987
Report Number EPA/600/J-87/377;
Stock Number PB88-251798
Additional Subjects Fungicides ; Toxicity ; Invertebrates ; Ecology ; Tests ; Exposure ; Carbamates ; Concentration(Composition) ; Nervous system ; Growth ; Histology ; Mortality ; Necrosis ; Electrophysiology ; Reprints ; Eisenia fetida ; Earthworms ; Benomyl ; LC 50
Library Call Number Additional Info Location Last
NTIS  PB88-251798 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14p
Earthworms (Eisenia fetida) were treated by surface contact exposure for four days with the fungicide benomyl. Non-invasive electrophysiological recordings after treatment with sublethal concentrations of 0.2-25 mg benomyl/litre of water indicated concentration-dependent decreases in conduction velocity for the medial and lateral giant nerve fibers. Threshold concentration for these effects was approximately two orders of magnitude less than the LC50. The effects on velocity were not accompanied by alterations in refractory period or impairment of locomotory reflexes, but persisted for at least several weeks after treatment. It is concluded that benomyl had subtle and sublethal neurotoxic effects on earthworm giant nerve fibers.