TEMPERATURE-DEPENDENT ACUTE TOXICITY OF METHOMYL PESTICIDE ON LARVAE OF 3 ASIAN AMPHIBIAN SPECIES

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)2322-2327
Journal / PublicationEnvironmental Toxicology and Chemistry
Volume34
Issue number10
Online published8 May 2015
Publication statusPublished - Oct 2015
Externally publishedYes

Abstract

Relative to other animal taxa, ecotoxicological studies on amphibians are scarce, even though amphibians are experiencing global declines and pollution has been identified as an important threat. Agricultural lands provide important habitats for many amphibians, but often these lands are contaminated with pesticides. The authors determined the acute toxicity, in terms of 96-h median lethal concentrations, of the carbamate pesticide methomyl on larvae of 3 Asian amphibian species, the Asian common toad (Duttaphrynus melanostictus), the brown tree frog (Polypedates megacephalus), and the marbled pygmy frog (Microhyla pulchra), at 5 different temperatures (15°C, 20°C, 25°C, 30°C, and 35°C) to examine the relationships between temperature and toxicity. Significant interspecific variation in methomyl sensitivity and 2 distinct patterns of temperature-dependent toxicity were found. Because high proportions of malformation among the surviving tadpoles were observed, a further test was carried out on the tree frog to determine effect concentrations using malformation as the endpoint. Concentrations as low as 1.4% of the corresponding 96-h median lethal concentrations at 25°C were sufficient to cause malformation in 50% of the test population. As the toxicity of pesticides may be significantly amplified at higher temperatures, temperature effects should not be overlooked in ecotoxicological studies and derivation of safety limits in environmental risk assessment and management.

Research Area(s)

  • Amphibian, China, Insecticide, Malformation, Multistressor

Citation Format(s)

TEMPERATURE-DEPENDENT ACUTE TOXICITY OF METHOMYL PESTICIDE ON LARVAE OF 3 ASIAN AMPHIBIAN SPECIES. / Lau, Edward Tak Chuen; Karraker, Nancy Elizabeth; Leung, Kenneth Mei Yee.
In: Environmental Toxicology and Chemistry, Vol. 34, No. 10, 10.2015, p. 2322-2327.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review