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Toxicity of Abate? to green frog tadpoles

June 16, 2010

Green frog tadpoles were exposed to a 96hr toxicity test using Abate4E, the formulation for temephos used in mosquito control. Concentrations ranged from 0 (control) to 10 uL/L. Concentrations as low as 2.60 uL/L reduced activity for several hours after exposure but had negligible effects after 24 hr, presumably because the temephos had degraded during that time. The LC50 for Abate was 4.24 uL/L. Butyrlcholinesterase activity, which is known to be more sensitive than acetylcholinesterase (AChE), declined with concentration of Abate with a significant depression bserved between controls and the lowest concentration used of 1.86 uL/L. However, AChE activity increased with concentration of temephos. Temephos must be converted to its sulfone form to reach maximum toxicity and tadpoles may be inefficient in metabolizing the parent compound. Hence, temephos may have stressed the tadpoles, causing them to release more acetylcholine and AChE. Toxic levels were above expected ambient concentrations found during mosquito control operations.

Citation Information

Publication Year 1997
Title Toxicity of Abate? to green frog tadpoles
Authors D.W. Sparling, T.P. Lowe, A.E. Pinkney
Publication Type Article
Publication Subtype Journal Article
Series Title Bulletin of Environmental Contamination and Toxicology
Index ID 5223195
Record Source USGS Publications Warehouse
USGS Organization Patuxent Wildlife Research Center