Survival Risk Analysis Honey bee Workers (Apis mellifera L., Hymenoptera) Exposed to Sub-lethal Concentration of Thiamethoxam

doi:10.16409/j.cnki.2095-039x.2017.05.009

Abstract

Abstract: Compared with the first generation neonicotinoids, thiamethoxam is used widely for its higher efficiency, broader spectrum and lower toxicity to mammalian. However, there are no reports on the sublethal effects of thiamethoxam on the honey bees Apis mellifera L., especially on the survival of the workers. Here we assessed the acute oral toxicities of thiamethoxam to the newly emerged bees (1 d), nurses (7 d) and foragers (22 d). Also, the survival risk of exposure to three sub-lethal concentrations (LC₅, LC₁₅ and LC₂₅) of thiamethoxam on different ages of workers was investigated. The results showed that the LC₅₀ for the newly emerged bees, nurses and foragers were 248.13, 64.18 and 44.20 ng/g, respectively. No significant differences in lifespan of the newly emerged bees and the foragers were detected between the control, LC₅ and LC₁₅ treatments, while LC₂₅ treatment reduced lifespan by 19.0 d. For the nurses, the LC₅ treatment didn't shorten bees' lifespan, but the LC₁₅ and LC₂₅ treatments reduced longevity by 9.2 and 15.0 d, respectively. For the foragers, there were no significant differences among the lifespan of the LC₅, LC₁₅ treatments and the control, while the LC₂₅ treatment shortened lifespan by 10.9 d. These results indicate that the extensive application of thiamethoxam has great potential threat on longevity of the honey bees. More attention to monitor the field residual of thiamethoxam and assess the risk of thiamethoxam on honey bees in semi-field and field context is needed.

Key words: thiamethoxam, Apis mellifera, workers, survival analysis, sub-lethal effects

CLC Number:

S476

YUE Meng, ZONG Fulin, MA Changsheng, WU Jie, LUO Shudong. Survival Risk Analysis Honey bee Workers (Apis mellifera L., Hymenoptera) Exposed to Sub-lethal Concentration of Thiamethoxam[J]. journal1, 2017, 33(5): 638-643.

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