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

Environmental Toxicology and Chemistry

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Abstract

African 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 LIV-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 earbaryl 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
Volume
17
Issue:
12
Year Published:
1998
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
2543
Last page:
2553
Number of Pages:
11