title: Biological response of earthworm, Eisenia fetida, to five neonicotinoid insecticides.
abstract: Earthworms (Eisenia fetida) are one of the most abundant terrestrial species, and play an important role in maintaining the ecological function of soil. Neonicotinoids are some of the most widely used insecticides applied to crops. Studies on the effect of neonicotinoids on E. fetida are limited. In the present work, we evaluated the effects of five neonicotinoid insecticides on reproduction, cellulase activity and the tissues of E. fetida. The results showed that, the LC50 of imidacloprid, acetamiprid, nitenpyram, clothianidin and thiacloprid was 3.05, 2.69, 4.34, 0.93 and 2.68mgkg(-1), respectively. They also could seriously affect the reproduction of E. fetida, reducing the fecundity by 84.0%, 39.5%, 54.3%, 45.7% and 39.5% at the sub-lethal concentrations of 2.0, 1.5, 0.80, 2.0 and 1.5mgkg(-1), respectively. The cellulase activity of E. fetida was most sensitive to clothianidin. Significant disruption of the epidermal and midgut tissue was observed after 14d exposure. In summary, we demonstrate that imidacloprid, acetamiprid, nitenpyram, clothianidin and thiacloprid have high toxic to earthworm, and can significantly inhibited fecundity and cellulase activity of E. fetida, and they also damage the epidermal and midgut cells of earthworm.
authors.affiliation: College of Sciences, China Agricultural University, China.
authors.forename: Kai
authors.initials: K
authors.lastname: Wang
authors.affiliation: College of Sciences, China Agricultural University, China.
authors.forename: Sen
authors.initials: S
authors.lastname: Pang
authors.affiliation: College of Sciences, China Agricultural University, China.
authors.forename: Xiyan
authors.initials: X
authors.lastname: Mu
authors.affiliation: College of Sciences, China Agricultural University, China.
authors.forename: Suzhen
authors.initials: S
authors.lastname: Qi
authors.affiliation: College of Sciences, China Agricultural University, China.
authors.forename: Dongzhi
authors.initials: D
authors.lastname: Li
authors.affiliation: College of Sciences, China Agricultural University, China.
authors.forename: Feng
authors.initials: F
authors.lastname: Cui
authors.affiliation: College of Sciences, China Agricultural University, China. Electronic address: Wangchengju@cau.edu.cn.
authors.forename: Chengju
authors.initials: C
authors.lastname: Wang
mesh_terms: D000818:Animals; D004305:Dose-Response Relationship, Drug; D054750:Ecotoxicology; D007306:Insecticides / Q000737:chemistry* / Q000633:toxicity*; D009538:Nicotine / Q000737:chemistry* / Q000633:toxicity*; D009835:Oligochaeta / Q000187:drug effects*; D012987:Soil / Q000737:chemistry; D012989:Soil Pollutants / Q000737:chemistry* / Q000633:toxicity*
chemical_list: D007306:Insecticides; D012987:Soil; D012989:Soil Pollutants; D009538:Nicotine
keywords: Cellulase activity; Eisenia fetida; Histophathology; Neonicotinoid insecticides; Reproduction