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TP16 Multiple Stressors in Amphibian Ecotoxicology
(OZM-1117-784489) Toxicity of Two Different Phyrethroid Insecticides on Xenopus laevis Tadpoles.
Aydin, H1, Gungordu, A1, Ozmen, M1, 1 Inonu University, Malatya, Turkey
ABSTRACT- Toxic effect of two phyrethroid insecticides, deltamethrin and lambda-cyhalothrin on Xenopus laevis tadpoles were investigated in this study. Tadpoles were exposed to insecticides under static renewal test conditions at 46th developmental stage for a period of seven days. Median Lethal Concentration (LC50), Lowest Observed Effective Concentration (LOEL), Nonobserved Effective Concentration (NOEL) were determined during 72th, 96th and 168th hours of exposure. Also different biotransformation and metabolic enzyme activities as markers of toxicity were investigated after 24 h exposure period. LC50s of deltamethrin of X. laevis tadpoles were determined as 0.221 mg/L, 0.044 mg/L and 0.0030 mg/L for 72, 96 and 168-h, respectively after three different exposure period. LC50s of lambda-cyhalothrin were 0.024 mg/L, 0.0090 mg/L and 0.0040 mg/L for the same period of time, respectively. Upon exposure of tadpoles to phyrethroids, there was significant difference for some enzyme activities such as lactate dehydrogenase (LDH) and glutathion S-transferase (GST) for deltamethrin exposure and carboxylesterase (CE) and GST for lambda-cyhalothrin exposure, while most other enzymes parameters such as catalase, glutathion reductase, acid phosphatase, aspartate aminotransferase and acetylcholinesterase were not significantly changed. Toxicological assessment data showed compared to deltamethrin, lambda-cyhalothrin was more toxic on Xenopus tadpoles at 46th developmental stage.
Key words: tadpole, phyrethroid insecticide, deltamethrin, lambda-cyhalothrin
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