کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4529478 | 1625966 | 2013 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Toxic and genotoxic effects of Roundup on tadpoles of the Indian skittering frog (Euflictis cyanophlyctis) in the presence and absence of predator stress Toxic and genotoxic effects of Roundup on tadpoles of the Indian skittering frog (Euflictis cyanophlyctis) in the presence and absence of predator stress](/preview/png/4529478.png)
Glyphosate, a post emergent herbicide, has become the backbone of no-till agriculture and is considered safe for animals. However, the impact of glyphosate on non-target organisms, especially on amphibians, is the subject of major concern and debate in recent times. We examined the toxic and genotoxic effects of Roundup, a commercial formulation of glyphosate, in the tadpoles of the Indian skittering frog (Euflictis cyanophlyctis). Roundup at different concentrations (0, 1, 2, 3, 4 and 8 mg acid equivalent (ae)/L), tested in a 2 × 6 factorial design in the presence and absence of predator stress, induced concentration-dependent lethality in tadpoles. The 96-h LC50 for Roundup in the absence and presence of predator stress were 3.76 mg ae/L and 3.39 mg ae/L, respectively. The 10-day LC50 value for Roundup was significantly lower, 2.12 mg ae/L and 1.91 mg ae/L in the absence and presence of predator stress, respectively. Lower concentrations of Roundup (1, 2 and 3 mg ae/L) induced the formation of micronuclei (MN) in the erythrocytes of tadpoles at 24-h (F3,56 = 10.286, p < 0.001), 48-h (F3,56 = 48.255, p < 0.001), 72-h (F3,56 = 118.933, p < 0.001) and 96-h (F3,56 = 85.414, p < 0.001) in a concentration-dependent manner. Presence of predator stress apparently increased the toxicity and genotoxicity of Roundup; but these effects were not statistically significant. These findings suggest that Roundup at environmentally relevant concentrations has lethal and genotoxic impact on E. cyanophlyctis; which may have long-term fitness consequence to the species.
► Roundup has lethal impacts on tadpoles of E. cyanophlyctis.
► Roundup at low doses within the lethal range is genotoxic to E. cyanophlyctis.
► Predator stress did not change genotoxicity significantly.
Journal: Aquatic Toxicology - Volumes 132–133, 15 May 2013, Pages 1–8