Temperature-dependent acute toxicity of methomyl pesticide on larvae of 3 Asian amphibian species

被引:22
|
作者
Lau, Edward Tak Chuen [1 ]
Karraker, Nancy Elizabeth [2 ]
Leung, Kenneth Mei Yee [1 ]
机构
[1] Univ Hong Kong, Fac Sci, Swire Inst Marine Sci, Sch Biol Sci, Hong Kong, Hong Kong, Peoples R China
[2] Univ Rhode Isl, Dept Nat Resources Sci, Kingston, RI 02881 USA
关键词
China; Insecticide; Malformation; Amphibian; Multistressor; WATER; SURVIVAL; GROWTH;
D O I
10.1002/etc.3061
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
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 degrees C, 20 degrees C, 25 degrees C, 30 degrees C, and 35 degrees 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 degrees 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. Environ Toxicol Chem 2015;34:2322-2327. (c) 2015 SETAC
引用
收藏
页码:2322 / 2327
页数:6
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