Photoenhanced toxicity of a carbamate insecticide to early life stage anuran amphibians

Environmental Toxicology and Chemistry
By: , and 

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Abstract

Aican clawed frog (Xenopus laevis) and gray tree frog (Hyla versicolor) embryos and tadpoles were exposed to sublethal levels of carbaryl, a broad-spectrum insecticide, and ultraviolet radiation to determine interactive and sublethal effects. Ultraviolet intensity (UV-B [285–320 nm] plus UV-A [321–400 nm]) was controlled with various types of plastic filters and quantified with a scanning spectroradiometer. Significant differences in swimming activity and mortality of both species were evident during the 96-h experiments. Ultraviolet-B radiation alone and carbaryl in the presence of UV-B significantly decreased swimming activity of both species. As little as 1.5% intensity of ambient solar UV-B radiation photoactivated carbaryl. Toxicity of 7.5 mg/L carbaryl increased by 10-fold in the presence of UV-B in all species and life stages tested. Our results indicate that photoenhancement by solar UV-B radiation should be considered when evaluating the toxicity of contaminants to amphibians and other organisms.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Photoenhanced toxicity of a carbamate insecticide to early life stage anuran amphibians
Series title Environmental Toxicology and Chemistry
DOI 10.1002/etc.5620171223
Volume 17
Issue 12
Year Published 1998
Language English
Publisher Wiley
Contributing office(s) Columbia Environmental Research Center
Description 11 p.
First page 2543
Last page 2553
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