Neonicotinoids stimulate H2-limited methane emission in Periplaneta americana through the regulation of gut bacterium community

文献类型： 外文期刊

第一作者： Bao, Haibo

作者： Bao, Haibo;Gao, Haoli;Zhang, Jianhua;Lu, Haiyan;Yu, Na;Zhang, Yixi;Tian, Jiahua;Liu, Zewen;Bao, Haibo;Zhang, Jianhua;Shao, Xusheng;Xu, Xiaoyong;Xu, Zhiping;Li, Zhong;Jin, Wei;Li, Shuqing

作者机构：

关键词： Neonicotinoids; Methane emission; Periplaneta americana; Gut bacterium

期刊名称：ENVIRONMENTAL POLLUTION （ 影响因子：8.071； 五年影响因子：8.35 ）

ISSN： 0269-7491

年卷期： 2021 年 285 卷

页码：

收录情况： SCI

摘要： Methane emitted by insects is considered to be an important source of atmospheric methane. Here we report the stimulation of methane emission in the cockroach Periplaneta americana and termite Coptotermes chaohuensis, insects with abundant methanogens, by neonicotinoids, insecticides widely used to control insect pests. Cycloxaprid (CYC) and imidacloprid (IMI) caused foregut expansion in P. americana, and increased the methane emission. Antibiotics mostly eliminated the effects. In P. americana guts, hydrogen levels increased and pH values decreased, which could be significantly explained by the gut bacterium community change. The proportion of several bacterium genera increased in guts following CYC treatment, and two genera from four could generate hydrogen. Hydrogen is a central intermediate in methanogenesis. All increased methanogens in both foregut and hindgut used hydrogen as electron donor to produce methane. Besides, the up-regulation of mcrA, encoding the enzyme for the final step of methanogenesis suggested the enhanced methane production ability in present methanogens. In the termite, hydrogen levels in gut and methane emission also significantly increased after neonicotinoid treatment, which was similar to the results in P. americana. In summary, neonicotinoids changed bacterium community in P. americana gut to generate more hydrogen, which then stimulated gut methanogens to produce and emit more methane. The finding raised a new concern over neonicotinoid applications, and might be a potential environmental risk associated with atmospheric methane. (c) 2021 Elsevier Ltd. All rights reserved.

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